operator's manual wireless dosimetry system - Best Medical Canada

OPERATOR'S MANUAL
FOR THE
WIRELESS DOSIMETRY SYSTEM
For use with mobileMOSFET Software Versions 2.2 and above
FDA LISTING: mobileMOSFET Wireless Dosimetry System listed as
Patient Dose Verification System, 510(k) #K041557
HEALTH CANADA: Medical Device License No. 68061

OPERATOR'S MANUAL FOR THE SYSTEM
WARRANTY
Best Medical Canada Ltd. warrants the mobileMOSFET Model TN-RD-70-W, dosimeters and
cables to be free from defects in material and workmanship for a period of one year from the date of
shipment.
This warranty does not apply to defects resulting from unauthorized modification or misuse of any
product or part, or to battery replacement or damage caused by battery leakage. Dosimeters
damaged due to excessive mishandling (examples include but are not limited to the flex being
strongly kinked or cut, or the epoxy bulb being cracked) will not be covered under warranty. Please
see Section 5.4 for more information on proper handling of dosimeters.
Please see the mobileMOSFET Software License Agreement for software support provided.
During the warranty period Best Medical Canada Ltd will, at our option, either repair or replace
within 30 days any product that proves to be defective. Repaired or replaced products are
warranted for the balance of the original warranty period or at least 90 days.
To exercise the warranty or obtain service, write or call the local Best Medical Canada Ltd
representative, or contact Best Medical Canada Ltd headquarters at the address and phone
number shown below:
Best Medical Canada Ltd.
25B Northside Road
Ottawa, ON K2H 8S1 Canada
Tel: (613) 596-4563 Fax: (613) 596-5243
Toll Free (North America only) 1-877-668-6636
www.TeamBest.com
bmcinfo@TeamBest.com
* In no event shall Best Medical Canada Ltd. be liable for any damages whatsoever arising
out of the use of or inability to use this product.
PRODUCT PATENTS
U.S. Patent Numbers 6,614,025
5,444,254
4,678,916
5,117,113
6,650,930
European (U.K. & DE) Patent Numbers EP 0575800
EP 0471957
Japanese Patent Number 3012364
Page 2 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
mobileMOSFET Software END USER LICENSE AGREEMENT
PLEASE READ CAREFULLY – The mobileMOSFET Software that comes with this
system is a product of Best Medical Canada Ltd. and may not be reproduced. You
may only install and use one copy of the product. If you have need for multiple
copies, you must enter into a specific MULTIPLE END USER LICENSE
AGREEMENT with Best Medical Canada Ltd.
Best Medical Canada Ltd. reserves the right to make changes and improvements to
its products without providing notice.
CONNECTBLUE AB OEM BLUETOOTH*
cB-0090-01 and cB-0701-01
FCC COMPLIANCE STATEMENT
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference and (2)
this device must accept any interference received, including interference that may
cause undesired operation.
*© connectBlue AB 2000-2003. BLUETOOTH is a trademark owned by the Bluetooth SIG Inc.
MANUFACTURER’S EU REPRESENTATIVE
Emergo Europe
Molenstraat 15, 2513 BH
The Hague
The Netherlands
NOTE: As of January 1, 2007, the name of the manufacturer "Thomson & Nielsen
Electronics Ltd." changed to "Best Medical Canada Ltd." Any future reference to Thomson
& Nielsen Electronics Ltd. in product literature, artwork or instrumentation is to be deemed
as being Best Medical Canada Ltd.
Document #101735.08 March 2007
Page 3 of 62
0120

OPERATOR'S MANUAL FOR THE SYSTEM
EXCLUSIVE USER WEB-SITE
Best Medical Canada Ltd welcomes you to an exclusive group of
professionals who believe that MOSFET dosimeters are the best dosimetry
device for every application. In an effort to help you easily access all of the
available support tools, we offer a web-site that is open to MOSFET
Dosimeter Users only. It contains many helpful features, including Technical
Support, Lists of Publications and Technical Notes, the latest Operator
Manual updates and News Updates, such as User Group Meeting
announcements. We encourage you to contact us for your password to enter
this special section of our web-site.
www.TeamBest.com
e-mail: bmcinfo@TeamBest.com
Toll Free: 1-877-668-6636 (N. America)
Ph: (613) 596-4563
Page 4 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
CONTENTS
1 GENERAL INFORMATION .....................................................................................................8
1.1 THIS MANUAL ............................................................................................................8
1.2 INTRODUCTION.........................................................................................................8
1.3 mobileMOSFET FEATURES.......................................................................................9
1.4 SAFETY PRECAUTIONS............................................................................................9
1.5 REFERENCES............................................................................................................9
2 SYSTEM DESCRIPTION......................................................................................................10
2.1 GENERAL .................................................................................................................10
2.2 mobileMOSFET COMPONENTS ..............................................................................11
2.3 OVERVIEW OF mobileMOSFET SOFTWARE FEATURES .....................................12
3 SYSTEM SET-UP .................................................................................................................17
3.1 SYSTEM REQUIREMENTS AND SETUP ................................................................17
3.2 BATTERY OPERATION............................................................................................18
3.3 CONFIGURE BIAS SENSITIVITY.............................................................................18
3.4 CONNECT DOSIMETERS ........................................................................................19
3.5 CONNECT SYSTEM .................................................................................................20
3.6 CONNECT PC...........................................................................................................20
3.6.1 Wireless Connection......................................................................................20
3.6.2 Cable Connection ..........................................................................................21
3.6.3 LAN/Wireless Connection..............................................................................22
3.7 INSTALLING mobileMOSFET SOFTWARE..............................................................24
4 OPERATING PROCEDURE .................................................................................................25
4.1 EQUIPMENT SET-UP (Screen 1) .............................................................................25
4.2 EQUIPMENT SETUP: CONFIGURATION ................................................................26
4.2.1 Connect To Reader Module...........................................................................26
4.2.2 Dosimeter Selection.......................................................................................28
4.2.3 Calibration Parameters (CFs and CRs): ........................................................28
4.3 Treatment information (Screen 2)..............................................................................30
4.3.1 Image Selection.............................................................................................31
4.3.2 Using Patients' Photographs During Measurement.......................................32
4.3.3 Templates – A Time Saving Feature .............................................................32
4.3.4 Dose Report Files: A Quick Template Alternative .........................................33
4.4 DOSE MEASUREMENT (Screen 3)..........................................................................33
4.5 LINEAR COMPENSATION FOR ARRAYS ...............................................................34
4.6 READING DOSIMETERS INDIVIDUALLY................................................................35
4.7 REMOVING DOSIMETERS ......................................................................................35
4.8 DOSIMETRY REPORT (Screen 4) ...........................................................................35
4.9 SEQUENTIAL READING ..........................................................................................37
Page 5 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
4.10 SIMULTANEOUS TREATMENT SESSIONS............................................................ 39
4.11 Message History Txt Files ......................................................................................... 40
4.12 Message Windows .................................................................................................... 40
5 DESCRIPTION OF SYSTEM COMPONENTS ..................................................................... 41
5.1 mobileMOSFET READER MODULE......................................................................... 41
5.1.1 Reader Side Panel Layout............................................................................. 42
5.1.2 Switches and LEDs ....................................................................................... 42
5.1.3 Reader Back Panel Layout............................................................................ 43
5.2 RECOMMENDED DOSIMETER AND BIAS SENSITIVITY COMBINATIONS FOR
APPLICATIONS IN RADIOTHERAPY AND RADIOLOGY ....................................... 44
5.3 DOSIMETERS........................................................................................................... 45
5.3.1 Single MOSFET Dosimeters ......................................................................... 45
5.3.2 Linear 5ive MOSFET Array Dosimeter .......................................................... 46
5.3.3 Linear 5ive ARRAY: CLINICAL IMPLEMENTATION AND DOSE SAMPLING47
5.4 WIRELESS TRANSCEIVER ..................................................................................... 50
6 mobileMOSFET SYSTEM MESSAGES................................................................................ 51
7 CALIBRATION PROCEDURE .............................................................................................. 52
7.1 CALIBRATION METHODS FOR RADIOTHERAPY USING THE mobileMOSFET
SOFTWARE AIDED CALIBRATION TOOL .............................................................. 53
7.2 CALIBRATION OF MOSFET AND LINEAR 5ive ARRAY MOSFET DOSIMETERS:
GUIDELINES FOR DIFFERENT ENERGIES (e.g. BRACHYTHERAPY) ....................... 55
7.3 BUILD-UP & PARTIAL BUILD-UP ............................................................................ 57
7.4 CALIBRATION FOR DIAGNOSTIC X-RAY ENERGIES ........................................... 57
7.5 TESTING A DOSIMETER FOR FADE (CHANGE IN PERFORMANCE).................. 58
8 MAINTENANCE ....................................................................................................................59
8.1 mobileMOSFET BATTERY MAINTENANCE AND REPLACEMENT........................ 59
8.2 ORDERING REPLACEMENT PARTS ...................................................................... 60
8.3 TECHNICAL SPECIFICATIONS ............................................................................... 61
Page 6 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
LIST OF FIGURES
FIGURE 3-1: MOBILEMOSFET READER MODULE STATUS PANEL............................................18
FIGURE 3-2: SYSTEM CONFIGURATION ......................................................................................19
FIGURE 3-3: EQUIPMENT SET-UP FOR A WIRELESS CONNECTION ........................................20
FIGURE 3-4: MULTIPLE READERS CONNECTED VIA WIRELESS TO A PC...............................21
FIGURE 3-5: VARIOUS WIRED SCENARIOS FOR CONNECTING READERS TO A PC..............21
FIGURE 3-6: LAN WIRELESS CONNECTION.................................................................................22
FIGURE 3-7: MULTIPLE SYSTEMS AND TREATMENT ROOMS...................................................23
FIGURE 3-8: SINGLE SYSTEM/MULTIPLE TREATMENT ROOMS ...............................................23
FIGURE 3-9: WINDOWS “RUN” POP-UP DIALOG BOX .................................................................24
FIGURE 4-1: EQUIPMENT SET-UP SCREEN.................................................................................25
FIGURE 4-2: READER CONFIGURATION WINDOW .....................................................................27
FIGURE 4-3: CONNECTING TO A MOBILEMOSFET READER .....................................................27
FIGURE 4-4: DOSIMETER SELECTION MENU ..............................................................................28
FIGURE 4-5: TREATMENT INFORMATION SCREEN ....................................................................30
FIGURE 4-6: PATIENT IMAGE WINDOW........................................................................................31
FIGURE 4-7: DOSE MEASUREMENT SCREEN .............................................................................34
FIGURE 4-8: DOSIMETRY REPORT SCREEN ...............................................................................37
FIGURE 4-9: SEQUENTIAL READING SCREEN ............................................................................38
FIGURE 4-10: SEQUENTIAL READING SETTINGS .......................................................................39
FIGURE 4-11: MULTIPLE VERIFICATION SESSIONS ...................................................................40
FIGURE 5-1: MODEL TN-RD-70-W TOP PANEL ............................................................................41
FIGURE 5-2: MODEL TN-RD-70-W SIDE PANEL ...........................................................................42
FIGURE 5-3: MODEL TN-RD-70-W BACK PANEL ..........................................................................43
FIGURE 5-4: SYSTEM CONNECTIONS ..........................................................................................43
FIGURE 5-5: MOSFET LINEAR 5IVE ARRAY .................................................................................46
FIGURE 5-6: MOSFET LINEAR 5IVE ARRAY BEFORE INSERTION IN THE 3-WAY CATHETER48
FIGURE 5-7: WIRELESS TRANSCEIVER .......................................................................................50
FIGURE 5-8: EXTENSION OF TRANSCEIVER-READER CABLE ..................................................51
FIGURE 7-1: CALIBRATION WINDOW............................................................................................53
FIGURE 8-1: BATTERY PACK PLACEMENT ..................................................................................59
Page 7 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
1 GENERAL INFORMATION
1.1 THIS MANUAL
The information in this manual is provided in eight sections and is intended for use
with mobileMOSFET Software Versions 2.2 and above. After a general introduction,
the instructions are laid out in the order of operation, with SYSTEM DESCRIPTION
and SYSTEM SET-UP instructions followed by OPERATING PROCEDURE. This is
followed by reference sections describing the System Components, Calibration and
other key information.
1.2 LABELING
The following table defines the labeling symbols that may be found on certain
mobileMOSFET system components and/or documentation.
Manufacturer
Date of manufacture (with date format of YYYY-MM)
Authorized Representative for the European Union
Consult Instructions
SN Serial Number
1.3 INTRODUCTION
mobileMOSFET, model TN-RD-70-W, is Best Medical Canada Ltd's mobile, battery
operated dose verification system intended for use in applications such as External
Beam and Brachytherapy radiotherapy to verify treatment planning, and Radiology to
measure dose uniformity and radiation exposure to the patient.
The System consists of PC-based user-interface software and one or more
mobileMOSFET Reader Modules. The Reader Module is small, lightweight, and
battery-operated. It hosts the MOSFET dosimeters and realizes the measurement
circuitry. The Software provides a console on screen for the operator to perform all
required actions in dose measurements, such as reading, displaying, saving and
printing results.
The mobileMOSFET Remote Monitoring Dose Verification Software can be used to
perform five treatment sessions simultaneously and each session can read up to eight
readers. Note: Throughout this Manual, the term "Reader" refers to the
mobileMOSFET Reader Module.
Page 8 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
The advantages of this system include:
• Reader portability through battery operation.
• Readers can be connected to a controlling PC through a wireless connection or by an
RS-232 cable.
• Each Reader can read up to 5 dosimeters or a single MOSFET Linear Array. Eight
Readers can be simultaneously used during a single procedure if required, allowing for
a total of 40 dosimeters.
• If LAN-to-Serial adapters are employed together with the wireless transceivers, the
distance between the PC and the Readers is greatly extended.
1.4 mobileMOSFET FEATURES
• Battery Operated – The NiMH power pack will allow for more than 20 hours of
continuous use, and allows for considerable mobility in treatment rooms.
• PC Connection – The Reader Module is connected to a PC to output the data from the
mobileMOSFET Reader Module via the mobileMOSFET Software program model TN-
RD-75, which allows the user to generate a report for the patient’s record.
• Software Controlled Operation - using mobileMOSFET Remote Monitoring Dose
Verification Software
• Direct Reading – Software readout in dosimeter voltage (mV)
• High Sensitivity - Depending on the Bias Sensitivity setting, the dosimeter and the
energy of interest used, dosimeter response ranges up to ≅35mV/cGy
1.5 SAFETY PRECAUTIONS
• Dosimeters supplied are intended for external application to intact skin or insertion into a
catheter suitable for the use intended. Contact of dosimeters or other parts of the system
with breached or compromised skin, bodily fluids or mucous membranes, is not
recommended. Should you have any questions, please contact Best Medical Canada Ltd.
• Material in the dosimeter may, on contact with skin, cause mild sensitization in some
persons.
• This System is intended for use by qualified personnel who recognize radiation hazards
associated with the use of radiation therapy and radiology equipment, and who exercise
appropriate safety measures.
• The system should only be used with the components listed in 2.2 below.
• The System contains no operator serviceable parts except for the rechargeable batteries in
the unit.
1.6 REFERENCES
Publications and technical notes describing the principles of operation of MOSFET dosimeters
and their applications are available on request from Best Medical Canada Ltd or visit our
website at www.TeamBest.com
.
Page 9 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
2 SYSTEM DESCRIPTION
2.1 GENERAL
The System is compact and easily transportable within a typical Radiotherapy or
Radiology treatment clinic or other laboratory. The dosimeters are placed on the
patient and measured by the Reader before and after irradiation. All data is output via
the mobileMOSFET Remote Monitoring Dose Verification Software, provided with
the system to control the Reader and generate a report for the patient’s record.
In operation, the mobileMOSFET Reader is set up in the treatment room and
connected to the required number of Dosimeters. The maximum number of MOSFET
dosimeters is five per Reader. Alternatively, one can connect a single MOSFET
Linear Array to a mobileMOSFET Reader. The mobileMOSFET Software can support
up to eight Readers simultaneously during a single procedure.
The measurement procedure is controlled by a PC using the mobileMOSFET
Software through the RS-232C cable or Best Medical Canada Ltd provided wireless
transceiver (BMC Part No. TN-RD-38). MOSFET dosimeters or the MOSFET Linear
Array can be taped to the patient or placed in a phantom. The dose measurements
are carried out by clicking the “START” and “READ” buttons on the Dose
Measurement Screen.
In applications, the mobileMOSFET Software can:
• Handle up to five (5) verification sessions simultaneously. Operations in each
session are totally independent.
• For each verification session, up to eight (8) Reader modules (or up to 40
dosimeters/8 Linear Arrays) can be used. Operations on each Reader
module (i.e. Start or Read) can be performed collectively or individually.
• For each Reader module, all dosimeters will be measured at the same time,
however, measurement on individual dosimeters can also be easily
performed (see Section 4.6).
The following section contains a detailed description of the System components.
For setting up, operating and calibrating the System, see Sections 3.0, 4.0 and 7.0,
respectively.
Page 10 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
2.2 mobileMOSFET COMPONENTS
TN-RD-70-W, mobileMOSFET Wireless Dosimetry System includes the following:
TN-RD-16 - Reader Module
TN-RD-38 - Bluetooth Wireless Transceiver, + 6ft./2m Cable
TN-RD-48 - 50 ft./15m RS-232 Cable (PC to Transceiver connection)
TN-RD-75 - mobileMOSFET Remote Monitoring Dose Verification Software,
One (1) License
TN-RD-77 - Medical Universal Power Adapter for mobileMOSFET
TN-502RD - MOSFET Dosimeters (Standard Sensitivity)
Optional:
TN-502RD - MOSFET Dosimeters (Standard Sensitivity)
TN-502RDM - microMOSFET Dosimeters (Standard Sensitivity)
TN-502RD-H - MOSFET Dosimeters (Standard Sensitivity) with Heat Shrink
Reinforcement
TN-502RD-HRO - MOSFET Dosimeters (Standard Sensitivity) with Radio-Opaque
Marker
TN-1002RD - High Sensitivity MOSFET Dosimeters
TN-1002RDM - High Sensitivity microMOSFET Dosimeters
TN-1002RD-H - High Sensitivity MOSFET Dosimeters with Heat Shrink
Reinforcement
TN-1002RD-HRO - High Sensitivity MOSFET Dosimeters with
Radio-Opaque Marker
TN-252LA5 - Standard Sensitivity Linear 5ive MOSFET Array
TN-502LA5 - High Sensitivity Linear 5ive MOSFET Array
TN-1002LA5 Extreme Sensitivity Linear 5ive MOSFET Array
TN-RD-56-0.63 - 0.63 cm Brass Hemispherical Build-up Cap
TN-RD-55-1.5 - 1.5 cm Hemispherical Build-up Cap
TN-RD-38/40 - LAN (Local Area Network) and Bluetooth Wireless
Transceiver Package
TN-RD-38 - Bluetooth Wireless Transceiver, 6 ft./2m RS-232 Connection
Cable
To set-up the system, see Section 3.0 (Please note, you will need the Reader’s
Serial Number.)
Page 11 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
2.3 OVERVIEW OF mobileMOSFET SOFTWARE FEATURES
This program catalogs its functions into five groups:
1. Equipment Setup
2. Treatment Information
3. Dose Measurement
4. Dosimetry Report
5. Calibration Tool
Five display/control screens let users access these function groups.
The following is an overview of these screens.
1. Equipment Setup
• Select Reader Count
• Assign Readers
• Change Calibration Factors (CFs) and Correction Factors (CRs)
• Check Status
(See Section 4.2 for a more detailed description of equipment set-up.)
Page 12 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
2. Treatment Information
• Input patient ID, treatment settings, and equipment information
• Assign dosimeters to patient(s), set target dose and indicate dosimeter positions
on the chosen image
• Use the program’s standard images or import your own (BITMAP, JPEG or GIF)
• Use templates to save time
Page 13 of 62

3. Dose Measurement
OPERATOR'S MANUAL FOR THE SYSTEM
• Click on the START button to initialize before IRRADIATION
• After irradiation, click on the READ button to obtain dose measurements
• Dose Data will be recorded and displayed on-screen & percentage deviation
from Target Dose will be calculated automatically
Page 14 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
4. Dosimetry Report
In the last step of the measurement procedure, Dosimetry Report, you can:
• Review your information, add in comments & save them
• Export your data as Microsoft Word® Excel® (tab-delimited files) documents or
Plain Text Files
• Edit saved reports
Page 15 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
5. Calibration Tool
• Will guide you through the Calibration Process
• Practice with the Calibration Simulation feature
• Save multiple Calibration Factors (CFs)
• Save multiple Correction Factors (CRs)
Page 16 of 62

3 SYSTEM SET-UP
OPERATOR'S MANUAL FOR THE SYSTEM
3.1 SYSTEM REQUIREMENTS AND SETUP
Computer:
• PC: with Windows®* Operating Systems 98/2000/XP.
• Mouse: PC Compatible.
• Wireless Transceiver or Cable: A Bluetooth serial port adapter or RS-232 cable
can be used to connect the PC to the mobileMOSFET Reader
• Monitor: any color monitor. This program can be used with screen resolution of 800
x 600 or higher. For the best effect, we strongly recommend that the screen
resolution be set to 1024 x 768.
• Printer: any laser printer or inkjet printer. The recommended paper sizes are
"Letter" (8.5” x 11”) or "A4". If the paper is too narrow, the reports may not print out
clearly.
• One (1) Standard Nine (9) Pin Male RS-232 ComPort
Reader Module:
• mobileMOSFET Patient Dose Verification System Reader (Model TN-RD-70-W)
• 100 � 240vAC Power Adapter (Note: The Reader is DC)
• Wireless Bluetooth, or RS-232 Cable to COM port
Dosimeters:
Must be one of:
• TN-502RD Standard Sensitivity MOSFET Dosimeters
• TN-502RDM Standard Sensitivity microMOSFET Dosimeters
• TN-1002RD High Sensitivity MOSFET Dosimeters
• TN-1002RDM High Sensitivity microMOSFET Dosimeters
• TN-252LA5 Standard Sensitivity Linear 5ive MOSFET Array
• TN-502LA5 High Sensitivity Linear 5ive MOSFET Array
• TN-1002LA5 Extreme Sensitivity Linear 5ive MOSFET Array
Build-up Caps:
• TN-RD-56-0.63 0.63 cm Brass Hemispherical Build-up Cap
• TN-RD-55-1.5 1.5 cm Hemispherical Build-up Cap
For more specifications on the MOSFETs, contact Best Medical Canada Ltd directly for
Technical Note #7, "MOSFET Dosimeter Specifications" or visit our website at
www.TeamBest.com
* Windows® Operating Systems 98/2000/XP, Windows XP are registered trademarks of MICROSOFT
Corporation.
Page 17 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
3.2 BATTERY OPERATION
The mobileMOSFET is intended to operate on battery power. The battery level for the
mobileMOSFET Reader Module is indicated on the Equipment Setup and Dose
Measurement screens, as well as windows that will pop-up advising you if your
battery level is getting low. There are two methods to recharge the batteries, Fast
Charge and Trickle Charge. The charging status is visible by the LEDs on the side of
the Reader. A green LED indicates that the unit is in Trickle Charge, while a red LED
indicates the Reader is in a Fast Charge.
To Fast Charge the mobileMOSFET Reader Module, ensure the unit is turned OFF
prior to connecting the unit to a power source. A Fast Charge will completely charge a
mobileMOSFET with a drained battery in approximately three hours. Once the
batteries are charged, the red LED will go out and the green LED will come on,
indicating Trickle Charge.
Trickle Charge supplies the battery with power at a continuous low rate thereby
keeping it charged. Trickle Charge allows the user to continue treatment sessions
when the Reader's battery is running low. Instead of having to be concerned with the
battery losing power, the user can just continue on with the session. To use Trickle
Charge, the mobileMOSFET must be ON and the power supply connected to the
Reader.
Prior to first use, place the Reader on Fast Charge (mobileMOSFET turned OFF
and power connected) until the red (Fast Charge) LED goes OFF and the green
(Trickle Charge) LED comes on. This will take a maximum of three hours.
Figure 3-1: mobileMOSFET Reader Module Status Panel
3.3 CONFIGURE BIAS SENSITIVITY
The Bias located inside the Reader provides regulated voltage to the MOSFET
dosimeters. This ensures reproducibility and linearity over the lifetime of the
MOSFET. The mobileMOSFET Reader provides a choice of two Bias sensitivities in
order to cover a wide range of doses with optimum reproducibility. The system allows
you to choose between two options: Standard (STD) for routine use, or High (HI)
Sensitivity for low doses.
Page 18 of 62
ATTENTION
BEFORE USING THE mobileMOSFET, IT IS RECOMMENDED THAT YOU CHOOSE ONE
SENSITIVITY SETTING AND LEAVE IT THERE FOR THE DURATION OF THE LIFE OF THE
DOSIMETERS TO BE USED.

OPERATOR'S MANUAL FOR THE SYSTEM
To determine which sensitivity best meets your needs, please review the chart in
Section 5.3, or contact Best Medical Canada Ltd for a copy of our Technical Note #3,
“Reproducibility Using Model TN-RD-22 Dual Sensitivity Bias Supply”.
A Sensitivity Switch is located on the front of the Reader adjacent to the five dosimeter
ports on the left-hand side (refer to Figure 5-4: System Connections). The switch is
recessed so that it cannot be accidentally switched to the wrong setting. In order to
change the setting, use a fine tipped object, e.g. a pen, to move the switch to the
appropriate setting.
3.4 CONNECT DOSIMETERS
MOSFET dosimeters require a permanent connection to a Reader for optimal
accuracy readings. If your dosimeters are to be used for the first time, connect them
to the Reader for at least one to twenty-four hours before use. Only connect and
calibrate those dosimeters that are to be used (up to five (5) individual MOSFETs or
one (1) Linear Array), and follow this procedure when ordering replacement
dosimeters. You must designate the type of dosimeter, single or array that you are
using, i.e. TN-252LA5, when configuring the equipment. (For Calibration, see Section
7)
NOTE: Single MOSFETs and the MOSFET Linear Array CANNOT be read
simultaneously on a Reader. If you wish to read the MOSFET Linear
Array, ensure that no MOSFETs are connected to the Reader and then
designate which type of Linear Array you will be using. To do this, go
to the Equipment Setup window in the mobileMOSFET Software, click
on the Configuration button and follow the instructions provided.
Conversely, if you wish to read single MOSFETs, ensure the MOSFET
Linear Array is not connected to the Reader.
Figure 3-2: System Configuration
Page 19 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
3.5 CONNECT SYSTEM
1) Connect the system together with all cables (see Figure 3-3: Equipment Set-up for
a Wireless Connection, below).
NOTE: If you are using the wireless connection, DO NOT connect the READER-PC
CABLE.
2) Prior to first use, place the Reader on Fast Charge. Turn the mobileMOSFET
OFF and connect the universal power adapter for the Reader to the “POWER IN”
jack on the back of the Reader, then plug the country specific line cord into the AC
outlet. The red Fast Charge LED will go on. When the Fast Charge LED goes off
and the green Trickle Charge LED goes on, the battery is fully charged. This will
take a maximum of three hours.
3) Power on the system and allow the electronics to warm up for at least fifteen (15)
minutes before proceeding. If the green Power LED is not flashing, the power
switch must be switched up to the momentary position to reconnect the battery
power.
3.6 CONNECT PC
3.6.1 Wireless Connection
Mount the TN-configured Bluetooth wireless transceiver on an interior wall of the
treatment room. Attach the 5V DC power supply, and connect the transceiver to the
PC’s COM port using the RS-232 cable (See Figure 3-3: Equipment Set-up for a
Wireless Connection).
Figure 3-3: Equipment Set-up for a Wireless Connection
Page 20 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
The distance between the transceiver and mobileMOSFET should be less than ten (10)
metres (33 feet) (see Section 5.5). For quality communication, it is suggested that the
transceiver be installed at a height of two (2) metres (6 feet) or more, and if possible,
on a surface without any obstacles between it and the intended location of the
mobileMOSFET.
The fifteen (15) metre (50 foot) Reader-PC cable can be used as an extension if the
RS-232 cable between the computer and the transceiver is not long enough.
More than one mobileMOSFET can be connected to a PC through a wireless
connection as depicted in Figure 3-2: System Configuration and Figure 3-4: Multiple
Readers Connected via Wireless to a PC.
PC
Figure 3-4: Multiple Readers Connected via Wireless to a PC
3.6.2 Cable Connection
A Reader-PC Cable is also supplied with the mobileMOSFET Software. Attach one
end to the PC and the other to the Serial Data Port on the back of the
mobileMOSFET Unit.
More than one mobileMOSFET can be connected to a PC as depicted in Figure 3-5:
Various Wired Scenarios for Connecting Readers to a PC.
PC
PC
COM 1
COM 1
COM 2
USB
USB TO
SERIAL
PORT
HUB
Figure 3-5: Various Wired Scenarios for Connecting Readers to a PC
Page 21 of 62
COM 5
COM 6
COM 7
mobileMOSFET 1
mobileMOSFET 2
mobileMOSFET 3
mobileMOSFET 1
mobileMOSFET 2
mobileMOSFET 1
mobileMOSFET 2
mobileMOSFET 3

OPERATOR'S MANUAL FOR THE SYSTEM
3.6.3 LAN/Wireless Connection
Best Medical Canada Ltd also provides an optional solution for establishing wireless
connections in additional treatment rooms via the LAN and Bluetooth Wireless
Transceiver Package, TN-RD-38/40. This accessory allows the mobileMOSFET
Reader Module to be shared amongst multiple rooms by connecting to a PC via a
LAN (Local Area Network) connection.
Figure 3-6: LAN Wireless Connection
The Bluetooth Wireless transceiver supplied is a serial device, however a LAN
connection can be implemented if a Serial Server is connected to the LAN port.
Virtual communications port (COM Port) software (supplied with the TN-RD-38/40)
allows the PC to connect to this COM Port anywhere on the LAN. Best Medical
Canada Ltd has tested and supplies a Vlinx Model ESP901 Ethernet Serial Server.
(Please note that installation may require a LAN administrator to configure the end
user's PC software IP settings.) Note: With virtual COM Port software, some users
experience a delay while the PC searches for COM Ports on the LAN.
Mount the BMC-configured Bluetooth wireless transceiver on an interior wall of the
treatment room. Attach the power supply, then connect the transceiver to the Serial
Server. Next, connect the Serial Server to the LAN and attach the LAN/Wireless
Transceiver's power adapter (See Figure 3-6: LAN Wireless Connection).
The distance between the transceiver and mobileMOSFET as well as the placement
of the transceiver and mobileMOSFET must be as specified in Section 3.6.1.
Figure 3-7: Multiple Systems and Treatment Rooms and Figure 3-8: Single
System/Multiple Treatment Rooms provide examples of possible configurations:
Page 22 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
Figure 3-7: Multiple Systems and Treatment Rooms
Figure 3-8: Single System/Multiple Treatment Rooms
Page 23 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
3.7 INSTALLING mobileMOSFET SOFTWARE
The entire software program is contained on one CD-ROM.
1) Before proceeding, we recommend that you close any applications you may have
running as Setup cannot install system files or update shared files if they are in
use.
2) Insert the CD in the computer.
3) From the Start menu, select Run
4) Click the Browse button. From the pop-up dialog box “Browse”, go to the
CD-ROM drive under “My Computer”. Click on “setup.exe”.
5) Open this and then click OK. This will then take you back to the “Run” pop-up
dialog box. Click on OK.
Figure 3-9: Windows “Run” Pop-up Dialog Box
6) Follow the instructions shown on your screen. (DO NOT change the default
installation folder.)
When the installation is finished, you will find that mobileMOSFET Software has been
added to the PC’s “Start | Programs” list.
Page 24 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
4 OPERATING PROCEDURE
Set-up the system as described in Section 3, SYSTEM SET-UP. Click on the
mobileMOSFET Software entry of your computer’s “Start | Programs” menu to run
the program. The program will open to the Equipment Setup Screen as shown in
Figure 4-1: Equipment Set-up Screen.
4.1 EQUIPMENT SET-UP (SCREEN 1)
Through this first screen, the User accesses many functions of the mobileMOSFET
Software. The number of Readers that will be used for each treatment session are
selected and assigned, the calibration parameters (CFs and CRs) can be modified,
dosimeter status can be verified and the overall system status of connected
components can be monitored throughout the treatment session. (See Section 7.1 for
more information regarding CFs and CRs.)
Figure 4-1: Equipment Set-up Screen
The first step in this screen is to set the number of mobileMOSFET Reader Modules
that will be used in the Treatment Session and then connect to them through the
CONFIGURE button. By clicking on this button a Configuration screen will pop-up
through which you can perform the steps noted above.
In the Reader Assignment section of the screen, the number of Readers being used
during each session, each Reader's Serial Number (S/N), Nickname (the User may
assign a "name" up to 5 characters and/or a number to identify it) and the port that the
Reader is connected to are displayed.
Page 25 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
MOSFET CF/CR – Each Reader can read up to five (5) dose points. One Standard
Dosimeter = one Dose Point. A Linear Array has five Dose Points and will display
each position on the Flex graphically on the right-hand side of the screen. The
dosimeters numbers are listed next to their corresponding Reader number, e.g. #1-4.
#1 = the Reader Module and –4 = the Dosimeter #4, or Dose Point #4.
Calibration Factor (CFs) units can be mV/cGy/, mV/Gy, or mV/R. The valid range is
0.01 to 9999.99. If you leave any of the CF fields blank, the CF unit will be in "mV
mode" therefore no CF, i.e. the dosimeter mV reading has not been altered. CRs are
optional Correction Factors. When used, CFs and CRs calculate the dose according to
the formula "DOSE = CR (Optional) * [Voltage/CF]". (See Section 7.1 for more
information regarding CFs and CRs.)
The Reader Status section of the screen shows the last time that the Reader status
was verified and is updated each time it is checked. The MOSFET Voltage portion
indicates the total voltage for each dosimeter's position. It will also indicate if a
dosimeter is absent or saturated (exceeded the Reader's dose range) as well as the
Bias setting for each Reader (Standard or High).
The type of MOSFET dosimeter being used as well as the dosimeter position is
displayed graphically. For example, for Standard MOSFETS a picture of a
mobileMOSFET indicating each dosimeter's position will be displayed. If a Linear 5ive
MOSFET Array (which has five positions) is being used, it will show that this is the type
of MOSFET connected to the Reader.
The Battery column provides a graphic indication of the approximate charge state of
each Reader's battery.
4.2 EQUIPMENT SETUP: CONFIGURATION
4.2.1 Connect To Reader Module
mobileMOSFET Software allows you to connect to the Reader Module using either a
cable or wireless transceiver, and automatically determines the type of connection
(wired or wireless) being used. To connect to the Reader, click the Configure button
from the Equipment Setup window (see Figure 4-1: Equipment Set-up Screen).
A separate Reader Configuration window will open where you select the number of
Readers you wish to use (as shown in Figure 4-2: Reader Configuration Window).
Page 26 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
Click Assign to search for and assign Reader(s). You are also given the option of
assigning a name (e.g. "One") to identify your Readers. You are allowed a
maximum of 5 alpha/numeric characters for each of these nicknames.
Figure 4-2: Reader Configuration Window
If a wireless transceiver is found, the program will search for Readers in the
vicinity as shown in Figure 4-3: Connecting to a mobileMOSFET Reader.
To select the Reader you wish to assign, double-click the icon of that Reader.
Figure 4-3: Connecting to a mobileMOSFET Reader
If a cable connection is found, double-click the icon of the Reader you wish to configure
as with the wireless transceiver.
Page 27 of 62
0043

OPERATOR'S MANUAL FOR THE SYSTEM
4.2.2 Dosimeter Selection
The next step in the Configuration window is to designate the type of dosimeter that
will be used in the treatment session, e.g. the standard single MOSFET, (one
dosimeter on a flex), or a Linear 5ive Array dosimeter (five dosimeters on one flex).
This feature is most important to those who wish to use the Linear Array, for reasons
outlined in “Section 5.3.2 Linear 5ive MOSFET Array Dosimeter”.
This feature is found at the bottom of the Configuration window (see Figure 4-4:
Dosimeter Selection Menu below) with the following message: “Please select the
type of dosimeter used by Reader #X”.
The software provides the option of choosing from: Single MOSFET, TN-252LA5
Array, TN-502LA5 Array, or TN-1002LA5 Array.
Figure 4-4: Dosimeter Selection Menu
4.2.3 Calibration Parameters (CFs and CRs):
These fields are used to show Calibration Parameters, including Calibration Factors
(CFs) and Correction Factors (CRs). A CF translates the MOSFET’s voltage reading
into a dose unit (i.e. Gy, cGy, R), and a CR is a multiplicative factor that can be used
to accommodate certain external factors (such as extrapolating partial dose depth
data to Dmax).
Page 28 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
The Reader will only read the MOSFET voltage in mV. The program transforms the
obtained voltage into dose according to User-defined Calibration Factors (CFs). The
program also enables the user to specify optional Correction Factors (CRs) for the
dose calculation.
The Calibration parameters (CFs and CRs) must be set, because they will be used to
calculate the doses according to the formula "Dose = CR (optional) * [Voltage / CF]".
The units of a CF can be in mV/cGy, mV/R or mV/Gy. The valid CF value is 0.01 to
9999.99. If you leave any of the CF fields blank, the CF units will be in "mV Mode". In
this case, the dose will be represented as a mV and it will be a direct voltage reading.
The allowed CR range is 0.01 to 99.99.
The software allows you to use different CFs/CRs for different treatments:
1) When you have determined the CF/CFs, save them to a file by clicking on "Save" in
the Configuration window. Give the files specific names to differentiate them.
2) The next time you wish to use a particular set of CF/CRs, open the Configuration
window and click on "Load" and choose from your predetermined list of CF/CR files.
Click on the file that you wish to use and the new CF/CRs will populate the
configuration window which can then be used for ensuing treatments.
You can set the CFs in mobileMOSFET Software by selecting Calibrate MOSFET from
the Tools drop-down menu of the Equipment Setup screen (See Figure 4-1).
Note: It is recommended that new MOSFETs be calibrated prior to the first time they are
used clinically.
See Section 7.1 for more information regarding CFs and CRs.
Page 29 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
4.3 TREATMENT INFORMATION (SCREEN 2)
Figure 4-5: Treatment Information Screen
When you have completed the Equipment Setup, you can then move to the next step by
simply clicking on the tab "Treatment Info". Treatment Information is input here, including
the target dose, as well as assigning the dosimeters to be used to the patient or phantom.
As the dosimeter locations are displayed both in a table as well as graphically, a
description of the location is entered in the Position column.
Once this information has been completed, it can be saved for use in future sessions
without having to re-input patient information or reassigning the dosimeters (see Section
4.3.3, for the use of templates).
ATTENTION
• You will NOT be able to read dose data if you do not select one or more
dosimeters. Select the dosimeters that you wish to read by clicking the MOSFET
Use column corresponding to the dosimeter(s) that you wish to use. A checkmark
will appear indicating which dosimeter(s) have been selected.
• When assigning dosimeters, ensure that you select the dosimeters that directly
correspond to the dosimeters you are actually using on the patient.
Page 30 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
4.3.1 Image Selection
The mobileMOSFET Software allows you to change the image displayed to reflect
the treatment session. To change an image, click on the Operations button shown
in Figure 4-5: Treatment Information Screen. Using the drop-down menu, select
"Change Patient Image", which will open a separate window, as shown in Figure 4-6:
Patient Image Window.
Figure 4-6: Patient Image Window
This program provides six optional images, called “Standard Images”.
They are:
� Unisex Body
� Female Chest
� Male Head
� Female Head
� Female Body
� IMRT Phantom
You can also import custom images from a digital camera or scanned photo. Any
BITMAP (*.bmp), JPEG (*.jpeg, *.jpg) or GIF ( *.gif) image may be used. There is no
size limitation for images.
Please note that in order to maximize the amount of space used for saved reports,
the images will be compressed to 40% of their original size. The images may
therefore not be as clear as the original file for this reason.
To use mobileMOSFET standard library images, click on the images to preview
them. To select one from the list, click on it and then the "Apply" button. To use a
Custom Image, refer to the "Custom Image Used" list in the same manner.
Page 31 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
If the image you want to use is not in the list, but is already stored in a file, click the
"Other" button to find and open it. After you apply this image, it will be automatically
added to the "Custom Image Used" list.
After the assignment of dosimeters, the corresponding Pointer/Dosimeter label will
appear on the image area. To indicate the specific location, drag the pointer to the
appropriate position (using the Treatment screen shown in Figure 4-5: Treatment
Information Screen).
4.3.2 Using Patients' Photographs During Measurement
Using custom images to indicate dosimeter sites was discussed briefly, above.
These images, however, may not exist before you run the program.
If you have a digital camera, you can use a photo of the patient or phantom taken
during treatment as follows:
A. In Step 2, input the patient's treatment information, but DO NOT select an image.
B. In Step 3, after placing dosimeters on the patient's body, take a photo. Then do
the measurement.
C. Minimize the mobileMOSFET Software window. Input the photo to your
computer, saving it on the hard disk as a JPEG file. Restore the "Step 3" Screen.
D. Return to the "Treatment Information" screen. Add the saved JPEG file to
"Custom Image Used" and select it. Open the picture.
E. Go to "Dosimetry Report" screen to view the report.
Remember: You can change the treatment information and dosimeterassignment
at any time BEFORE exiting the program. If you
change this information AFTER the corresponding report has
been saved, however, you should save the changed report under
a new name. (Alternatively, you can delete the previous report.)
4.3.3 Templates – A Time Saving Feature
Treatment Information templates may be created in advance of the Treatment
Session in order to save time, and/or to outline the target dose plan for a patient
over the course of his/her treatments. Templates are created to guard information
that a physicist or therapist will not want to repeatedly enter, e.g. Target Doses,
Patient Name, Dosimeter Positions, etc. Multiple templates may be created.
To use this feature:
1) Enter the information into the Treatment Information window, as described in
Section 4.3.
2) To save the data, click on the Operations button and select the “Save Template”
option in the drop-down menu.
3) The data entered in the Treatment Information window will be saved for future
use.
Page 32 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
To open a template:
1) Click on the Operations button in the Treatment Information window and select
the “Open Template File” option in the drop-down menu.
2) If necessary, enter additional information or change the data.
3) Proceed to the Dose Measurement window.
4.3.4 Dose Report Files: A Quick Template Alternative
Instead of creating the abovementioned Template files, one may also use a Dose
Report File as a Template in order to avoid re-entering data, such as Patient Name
& Target Doses.
To use this feature:
1) Click on the Operations button in the Treatment Information window and select
the “Open Saved Report File” option in the drop-down menu.
2) If necessary, enter additional information or change the data.
3) Proceed to the Dose Measurement screen.
4.4 DOSE MEASUREMENT (SCREEN 3)
A. Place MOSFETs and required build-up on the patient. (We suggest that you print out
the dosimeter-site diagram from the "Treatment Information" screen as a reference.)
If required, a low-level disinfecting of the patient contact area of the dosimeter may be
accomplished with a swab of 70% isopropyl alcohol prior to use. Using a sterile
gauze pad moistened with alcohol, wipe the entire length of the dosimeter a minimum
of three times and allow to air dry.
B. The dosimeters can now be attached to the patient using commonly available surgical
or paper tape. Care should be taken in tape selection due to the fragility of the
dosimeter tip. As an example, Best Medical Canada Ltd recommends the use of 3M
Micropore tape with low adhesion, but not 3M Transpore tape with very high
adhesion. Use care when removing the tape, and be sure to remove the tape prior to
removing the dosimeters from the patient or phantom. Please contact Best Medical
Canada Ltd for more information.
IMPORTANT
WHILE THE MOSFET DOSIMETER IS DESIGNED FOR EVERYDAY
CLINICAL USE, ITS LIFE CAN BE SHORTENED THROUGH
MISHANDLING. PLEASE ENSURE THAT PHYSICAL STRESS TO THE TIP
OF THE DOSIMETER IS MINIMIZED DURING PROCEDURES.
Reference Section 5.4 on Dosimeter Care
C. To retain calibration, dosimeter orientation, beam and field size, the amount of buildup
should be the same as that used during calibration. (See Section 7, CALIBRATION.)
D. If build-up is required, refer to Section 7.1, Calibration for Radiotherapy.
Page 33 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
E. INITIALIZE the MOSFETs by clicking on the START button on the screen.
F. Irradiate.
G. AFTER irradiation, read the MOSFETs ----- click on the READ button to obtain
dose information.
Figure 4-7: Dose Measurement Screen
4.5 LINEAR COMPENSATION FOR ARRAYS
On the Dose Measurement screen there is a column entitled "LC". This column is
used to display the "Linear Compensation" factors for TN's Linear Array dosimeters.
If a single MOSFET is being used (i.e. TN-502RD), no compensation is required and
"N/A" will be displayed in the LC column.
A Linear Array, however, requires compensation. If a voltage difference is detected
during the Start-Read period, the mobileMOSFET Software will calculate the
corresponding LC number based on the Array in use and the detected difference.
If the type of Array has not been designated, a question mark, "?", will appear in the
LC column to indicate that the Array has not been set. To do this, return to the
Configuration Window in the Equipment Setup screen and select the type of array you
are using. The compensation will automatically be applied to the final doses.
Page 34 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
4.6 READING DOSIMETERS INDIVIDUALLY
The mobileMOSFET Dose Reporter Software gives the user the ability to read the
MOSFET dosimeters individually during measurement. This allows the user to take
readings without having to stop during the treatment session to move the dosimeters
to another position on the patient and the results output in a single Dose Report.
To use this application, go to the "Treatment Info" Screen, select which dosimeter(s)
to be read first, proceed to the Dose Measurement window, read them, then repeat
this process as often as necessary until all dosimeters have been read. By using this
method, the software only Initializes or Reads the dosimeters identified as "in-use"
when the Start or Read button is clicked.
For example, the patient has two areas (fields) that are to be irradiated, the face and
the neck. Dosimeters A1 and A2 are placed on the patient's face, while dosimeters
A4 and A5 are placed on the neck.
First, prior to irradiating the face, go to the Treatment Info tab and under MOSFET
Use, select A1 and A2 (ensuring that the remaining dosimeters are not selected,
therefore not "in use"). Next, proceed to the Dose Measurement Screen, click on the
Start button before the beam is turned on, and then click on the Read button after the
beam has been turned off.
Before the next field (neck) is irradiated, go back to the Treatment Info window and
remove MOSFETs A1 and A2 from the "in use" column, and then select A4 and A5.
Again go to the Dose Measurement window and repeat the process of clicking on the
Start button before the beam is turned on and the Read button after it has been
turned off.
To output the results on one Dosimetry Report, simply go back to the Treatment
Information screen and select MOSFETs A1 and A2 so that A1, A2, A4 and A5 are all
"in use". The report can be printed out from the Dosimetry Report window, where the
measurement results from all 4 dosimeters will be combined in a single report.
4.7 REMOVING DOSIMETERS
Read the dosimeters within 15 minutes of irradiation and then carefully remove the
dosimeters from the patient.
(Note – See Section 5.4 regarding the importance of dosimeter care.)
4.8 DOSIMETRY REPORT (SCREEN 4)
This last step allows you to review the information you've obtained in several ways.
You can type in any comments/notes you wish to add, save the data and then print it
in TN's report format. Saved reports can be opened and edited if necessary. If
changes are made to a saved report, however, it is recommended that the revised
report be saved under a new name. In addition, you can easily export the data to
both Microsoft® Office Excel, Microsoft® Office Word, and Plain Text file formats.
Page 35 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
All mobileMOSFET Software report files have a filename with the extension of ".mrpt".
The default file name is "Patient's First Name + Patient's Last Name + Date
(YYYMMDD) + Time (when the latest dose data was received) + .mrpt". For example,
if John Smith was treated on August 18, 2005 and the last dose data was received at
1:21 p.m., the default file name would be:
John Smith_20050818_1321.mrpt
Please note that if you wish to use the data collected in a future session, you must
save it in the ".mrpt" format. The mobileMOSFET Software gives you the option of
saving reports with or without password protection. Should you wish to protect your
report, you will be asked to enter a password (maximum of 20 characters, no spaces
are allowed) and then confirm it.
To export the information to Microsoft® Office Excel Microsoft® Office Word or as a
Plain Text File, simply select a format from the Operations drop-down menu as shown
in Figure 4-8: Dosimetry Report Screen, and the mobileMOSFET Software will
automatically export the data.
If you export to Microsoft® Office Excel, a window will automatically open and
populate "Sheet 1" with the raw dose data and "Sheet 2" will contain the patient image
and dosimeter locations. When you export to Microsoft® Office Word, a Word
document will be automatically populated with the entire dose data information. This
document can then be saved and imported in Record and Verify programs that allow
for the use of Word documents. Finally, if you want to retrieve the final dose data
from another software program, e.g. a dose calculation software program, then you
can export and save the data to a Plain Text file.
Once the data has been exported, you may save your data as an Excel, Word or Plain
Text file, however, remember that it must also be saved as a mobileMOSFET
Software report if you wish to access the data in the future. Also, as the data in the
Excel, Word or Plain Text documents can be altered, please ensure that the
mobileMOSFET Software Dosimetry Report is the final report for your legal/patient
files.
Page 36 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
Figure 4-8: Dosimetry Report Screen
4.9 SEQUENTIAL READING
This feature enables you to read dose data periodically or at pre-determined time
intervals. This is a useful tool for research and development activities or lengthy
procedures such as Brachytherapy or Fluoroscopy.
To access this feature, run the mobileMOSFET Software and go to the Dose
Measurement screen. Click on Tools | Sequential Reading. (As the Sequential
Readings rely on uninterrupted communication with the wireless transceiver, only one
verification session can be running at a time in order to prevent any delays.)
An example of the results from a Sequential Reading are shown in Figure 4-9:
Sequential Reading Screen.
Page 37 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
Figure 4-9: Sequential Reading Screen
Page 38 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
To alter the settings of this screen, click on the CHANGE button in the Settings area of the
screen. The pop-up screen offers two areas that can be customized, "What to Read" and
"How to Read".
Figure 4-10: Sequential Reading Settings
1) What to Read - Choose to read in Dosimeter Total Voltage (mV) and you will see
total voltage accumulating with radiation exposure. If you choose Incremental Dose
After Initialization, incremental dose (based on previously input CFs) will be
displayed from a 0mV reference.
2) How to Read:
a) Automatically (Default): The software will continuously read the doses at
prescribed intervals during irradiation. You do not need to continually press the
READ button, as this will be performed automatically from the software.
The Interval function is used to read dose data at specified time intervals. The
interval between readings can be set to a wide area of values ranging from
10 seconds, 15 seconds, up to 30 minutes.
b) Manually: This allows you to click on the READ button to measure the
dosimeter doses on demand. Initialization is only required once.
4.10 SIMULTANEOUS TREATMENT SESSIONS
The mobileMOSFET Software allows the user to simultaneously conduct up to five
treatment sessions. Each session has a dedicated verification window, and the
operations of each are totally independent.
To add a new session, click on the File | Add Verification Window in any of the
screens. Each session is assigned a "Session Number" from 1 to 5. This number is
displayed on the window's title bar as well as in the top right-hand corner of the
window along with the Patient's name.
Page 39 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
To move from one session to another you can minimize the current session. All
open sessions will be shown at the bottom of the screen. You can also click on
"File" and select the Verification Session you wish to switch to from the drop-down
menu.
Figure 4-11: Multiple Verification Sessions
4.11 MESSAGE HISTORY TXT FILES
All messages sent by the Reader to the Software are recorded in a Message History
File. The Message History Files are saved in "C:\TN-Dosimetry\mobileMsgAchieve",
which can be viewed and printed using "Notepad". One can cut and paste this
information into other electronic documents.
A Message History File contains the connection and dose history of each connected
Reader, including records of connection activities, battery status and dosimeter
readings.
Each time a Message History File is opened, the mobileMOSFET will check its size.
It if is larger than 50KB, it will be archived to "C:\TN-Dosimetry\mobileMsgArchive".
4.12 MESSAGE WINDOWS
Pop-up windows are used to display Reader Status messages from the Reader.
View the Reader Status records at any time on each screen by selecting
Connection Log or Reader Status Log from the Tools | View menu.
Page 40 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
5 DESCRIPTION OF SYSTEM COMPONENTS
5.1 mobileMOSFET READER MODULE
Figure 5-1: Model TN-RD-70-W Top Panel
The operations of the Reader are controlled by the mobileMOSFET Software.
The Reader carries out the following functions:
• Measures the dosimeter before and after irradiation.
• Provides power and data distribution.
Page 41 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
5.1.1 Reader Side Panel Layout
The side panel contains the status LEDs. The following paragraphs describe these
items in detail.
Figure 5-2: Model TN-RD-70-W Side Panel
5.1.2 Switches and LEDs
The “POWER” SWITCH –has three states (OFF, ON, INITIALIZE
BATTERY/MOMENTARY). The INITIALIZE position is a temporary position used to
reconnect the battery if the unit battery has been completely drained. To INITIALIZE
the Reader, depress the switch to the ON position.
When using the unit, ensure that the mobileMOSFET is in the ON state and the
green LED is flashing. The ON position is with the switch depressed to I, and the
OFF position is with the switch depressed to O (please see Figure 5-3: Model TN-
RD-70-W Back Panel).
1
2
3
4
1
2
The “WIRELESS” LED – is a blue indicator that signals if the
mobileMOSFET Reader is currently connected to a PC via a wireless
transmitter.
The “POWER” LED – is also a green indicator that signals that the
unit is turned on.
The “TRICKLE” LED – is a green indicator that the unit is currently in
trickle charge.
The “FAST” LED – is a red indicator that signals the unit is currently in
a fast charge.
Page 42 of 62
3
4

OPERATOR'S MANUAL FOR THE SYSTEM
5.1.3 Reader Back Panel Layout
The following paragraphs describe each of the connectors and their specific
purpose:
POWER SWITCH
Figure 5-3: Model TN-RD-70-W Back Panel
POWER IN: Input power jack for the supplied universal power adapter.
ON – OFF: Power switch (also reference Section 5.1.2)
RS-232 I/O: RS-232C standard serial port used by the Reader to transmit data to
and from the PC via a Best Medical Canada Ltd supplied cable.
WIRELESS CONNECTION: The remote connection to the transceiver is embedded
inside the mobileMOSFET Reader Module
BIAS SELECTION
POWER JACK
MOSFET DOSIMETER PORTS
Figure 5-4: System Connections
BIAS SELECT - Sets the sensitivity of the mobileMOSFET. Refer to Section 3.3
for additional information regarding this setting.
MOSFETs - Up to 5 MOSFETs can be connected to a mobileMOSFET
Reader.
ARRAY - A single Linear MOSFET Array can be connected to the
mobileMOSFET.
Page 43 of 62
STANDARD SERIAL PORT
LINEAR ARRAY PORT

OPERATOR'S MANUAL FOR THE SYSTEM
Page 44 of 62
NOTE
MOSFETS AND A MOSFET LINEAR ARRAY CANNOT BE READ
SIMULTANEOUSLY. IF YOU WISH TO READ THE MOSFET LINEAR
ARRAY, ENSURE NO SINGLE MOSFETS ARE CONNECTED TO THE
READER. CONVERSELY, IF YOU WISH TO READ SINGLE MOSFETS,
ENSURE THE MOSFET LINEAR ARRAY IS NOT CONNECTED TO THE
READER.
5.2 RECOMMENDED DOSIMETER AND BIAS SENSITIVITY COMBINATIONS FOR
APPLICATIONS IN RADIOTHERAPY AND RADIOLOGY
In order to determine which components best meet your needs, please review the
following chart:
RADIOTHERAPY APPLICATION
TYPICAL
APPLICATION
Scatter Dose/
Research
RADIOTHERAPY
DOSE
1 to 20 cGy
RECOMMENDED
DOSIMETER
High Sensitivity
Dosimeter
RECOMMENDED
BIAS SENSITIVITY
High Setting
Central/ Scatter
Dose 20 to 100 cGy Standard Dosimeter High Setting
TBI/ Central Dose >100 cGy Standard Dosimeter Standard Setting
TYPICAL
APPLICATION
RADIOLOGY APPLICATION
RADIOLOGY SKIN
ENTRANCE DOSE
Radiology 0.1 to 5 R
Normal
Fluoroscopy
High Dose
Fluoroscopy
RECOMMENDED
DOSIMETER
High Sensitivity
Dosimeter
RECOMMENDED
BIAS SENSITIVITY
High Setting
5 to 20 R Standard Dosimeter High Setting
20 to > 100 R Standard Dosimeter Standard Setting

OPERATOR'S MANUAL FOR THE SYSTEM
5.3 DOSIMETERS
The dosimeter is composed of a 1.4 meter cable attached to a length of thin, semiopaque
polyimide laminate, also known as "the flex", with a silicon detector mounted
on the end
5.3.1 Single MOSFET Dosimeters
On Single MOSFETs, the silicon detector itself is mounted on the end of the polyimide
material while on the Linear 5ive Array (see Section 5.3.2) they are mounted at 2cm
inter-spacing, each MOSFET under a 1mm layer of black epoxy.
Individual calibration factors (CFs) of between 0.01 and 9999.99 for up to 20 dosimeters can
be operator entered into the mobileMOSFET Software. The CFs are used to convert the
dosimeter voltage to cGy, R or Gy when selected.
The following two tables show the dosimeter sensitivities.
STANDARD SENSITIVITY DOSIMETER MODELS TN-502RD & TN-502RDM
DOSIMETER
BIAS
SENSITIVITY
SETTING
Page 45 of 62
NOMINAL
SENSITIVITY
ENERGY SOURCE
Standard Standard 1 mV/ cGy Co 60 with buildup
Standard High 3 mV/ cGy Co 60 with buildup
Standard Standard 3 mV/ R Diagnostic X-ray
Standard High 9 mV/ R Diagnostic X-ray
HIGH SENSITIVITY DOSIMETER MODELS TN-1002RD & TN-1002RDM
DOSIMETER
BIAS
SENSITIVITY
SETTING
NOMINAL
SENSITIVITY
ENERGY SOURCE
High Sensitivity Standard 3 mV/ cGy Co 60 with buildup
High Sensitivity High 9 mV/ cGy Co 60 with buildup
High Sensitivity Standard 10 mV/ R Diagnostic X-ray
High Sensitivity High 30 mV/ R Diagnostic X-ray

OPERATOR'S MANUAL FOR THE SYSTEM
5.3.2 Linear 5ive MOSFET Array Dosimeter
For additional information, see Technical Note #8.
Real-time evaluation of the quality of the implant or HDR dose delivery can be provided by
the in-vivo use of a MOSFET 5ive Linear Array Dosimeter (models TN-252LA5, TN-502LA5,
or TN-1002LA5). These measurements will allow immediate assessment of post-implant
base and apex dose coverage, as well as the dose to organs at risk such as the urethra,
rectum or bladder.
Standard MOSFET Dosimeters, which have one dosimeter located at the tip of the flex, are
linear with dose, with a 5% maximum variation of the calibration factor throughout the entire
20,000mV reading range of the MOSFET. The initial calibration factor can be used for all
measurements, without a need for further calibration or correction.
In the case of the Linear 5ive Array, linearity corrections (LC) are implemented automatically
in the mobileMOSFET Dose Reporter Software at doses above 5000cGy. This is run ‘in the
background’ by the software and is visible to the user in the LC column. These linearity
corrections will remain accurate throughout the 20,000 mV reading range of the dosimeter.
For this reason it is very important that the user designate the correct type of Linear Array
being used as well as the Bias selection (Standard or High) to allow the software to properly
calculate and correct the CFs.
Figure 5-5: MOSFET Linear 5ive Array
Dimensions: 1.5mm wide, 46cm long, 1.3mm thick, 2cm Inter-MOSFET Spacing.
The Radio-Opaque Marker located at tip of flex, 7mm away from
the center of the first MOSFET on the array.
Page 46 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
Radiation Characteristics:
• 0.04 mm 2 active detection area
• Suitable for photon and electron modalities
• Isotropic response (±3% for 360 ο )
• Dose rate independent
• Constant sensitivity under full build-up for all energies
• Visible under CT or Fluoroscopy
Sensitivity under full build-up ( 60 Co)
ARRAY STANDARD SENSITIVITY HIGH SENSITIVITY
TN-252LA5
TN-502LA5
TN-1002LA5
Page 47 of 62
0.81 mV/cGy
2.76 mV/cGy
6.43 mV/cGy
Dose reproducibility at standard sensitivity bias at 1σ
1.11 mV/cGy
3.8 mV/cGy
9.27 mV/cGy
ARRAY 20 cGY 200 cGY
TN-252LA5
TN-502LA5
TN-1002LA5
< 2 %
< 2 %
< 2 %
Three array types for all your applications:
< 1 %
< 1.5 %
< 1.5 %
1. TN-252LA5 for moderate to high dose (20~2000 cGy) applications:
(HDR Brachytherapy 192 Ir, IMRT QA)
2. TN-502LA5 for low to moderate dose (1~100 cGy) applications:
(LDR Brachytherapy, Diagnostic X-rays)
3. TN-1002LA5, for low and very low dose (1~20cGy) applications
(LDR Brachytherapy, Diagnostic X-rays).
5.3.3 LINEAR 5ive ARRAY: CLINICAL IMPLEMENTATION AND DOSE SAMPLING
Pre-Implant Procedure:
1. Prior to the in-vivo measurements the array is sterilized in Cidex solution.
2. The array is then attached to a Bias Supply and connected to a MOSFET 20
Reader for initialization.

OPERATOR'S MANUAL FOR THE SYSTEM
3. The detector is inserted into the central branch of an approved three way sterile
catheter via a ‘Y’ connector (see Figure 5-6: MOSFET Linear 5ive Array Before
Insertion in the 3-Way Catheter), which then is inserted in the urethra, rectum or
bladder. The radio-opaque marker, located on the tip of the array, helps visualize,
under fluoroscopy or CT, the 5 MOSFET positions relative to the internal bladder
wall (at the lower edge of the catheter balloon). The array size, its waterproof cable,
and the use of a Y type connector make body fluid evacuation clean and easy,
helping to make the patient more comfortable.
During the LDR Implant or HDR Procedure:
1. During the implant or HDR procedure, 5 dose points can be read directly from the
array, or remotely from a computer, displaying the real urethral dose profile
throughout the prostate location, compared to the planned profile.
2. From urethra dose readings, one can infer the maximum initial dose rate (IDRmax)
to the urethra and compare it to the recommended dose limit (1.5-2 mPD:
minimal Peripheral Dose). The measured dose versus distance curve along the
prostatic urethra contains the information about two factors related to the quality
of the implant: the dose rate at the base of the prostate and the length of urethra
that receives the mPD, compared to the length of the urethra measured with
ultrasound.
End of Implant Procedure:
1. After the implant, real time dosimetry using the Linear Array MOSFET Dosimeter
allows for correction of lack of the proper dose coverage at the prostate base.
However there is no practical way to reduce an excessive urethral dose, except
that a patient may be followed closely during post treatment phase and
considered to be at increased risk for urethral complications.
Figure 5-6: MOSFET Linear 5ive Array Before Insertion in the 3-Way Catheter
Page 48 of 62

5.4 DOSIMETER CARE
OPERATOR'S MANUAL FOR THE SYSTEM
IMPORTANT
WHILE THE MOSFET DOSIMETER IS DESIGNED FOR EVERYDAY CLINICAL
USE, ITS LIFE MAY BE SHORTENED THROUGH MISHANDLING. PLEASE
ENSURE THAT THE IMPORTANT GUIDELINES PROVIDED BELOW ARE USED
TO CARE FOR DOSIMETERS. ALSO PLEASE REFERENCE THE WARRANTY
SECTION OF THIS DOCUMENT.
5.4.1 STORAGE
New dosimeters are packaged in a protective sleeve. Always store the dosimeter in this
sleeve when not in use.
5.4.2 USE OF TAPE
Care should be taken in tape selection. Always use low adhesive surgical tape to attach
MOSFETs to a surface. Best Medical Canada Ltd recommends the use of 3M Micropore
tape with low adhesion, but not 3M Transpore tape with very high adhesion. Use care when
removing the tape, and be sure to remove the tape first, prior to removing the dosimeters
from the patient or phantom. If required, dosimeters can be ordered with additional heatshrink
for extra strength. Contact Best Medical Canada for information.
5.4.3 CARE DURING USE
A. While the dosimeter is designed to flex during clinical use, avoid kinking the flex as this
can shorten it's life, as well as affect the product warranty.
B. Always use sterile lubricating gel to ease insertion as this helps to prevent kinking.
C. Avoid tugging on the flex to remove.
D. Use bolus to protect the dosimeter when using phantoms or build-up material.
E. Avoid touching the dosimeter connector to avoid possible ESD (electrostatic discharge)
shocks.
F. Do not modify the dosimeter by removing any of the protective coverings that are
designed to protect the dosimeter during use.
Page 49 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
5.5 WIRELESS TRANSCEIVER
MOUNTING HOLES, 03.3x23 mm
5V DC INPUT
Figure 5-7: Wireless Transceiver
The transceiver is used to control the Reader and receive dose data wirelessly. It
has been configured so that it is dedicated to Best Medical Canada Ltd’s
mobileMOSFET Wireless Dosimetry System.
Before using the transceiver, you must:
• Mount the transceiver in the treatment room. For reliable communication, we
suggest that you place the transceiver in a location (on a wall) at a height of 2
meters/6.5 feet or higher from the floor, and without obstacles (i.e. brick or steel
reinforced walls) between the transceiver and the Reader. Do not place the
transceiver close to large metal objects.
• Provide power to the transceiver using the 5V DC Power Supply
• Connect the transceiver to your computer’s COM Port using the DTE-to-DTE
RS-232 cable
NOTE: THIS TRANSCEIVER IS INTENDED FOR SHORT-RANGE (10 METERS/30
FEET) COMMUNICATION ONLY. IF THE READER IS PLACED TOO FAR FROM
THE TRANSCEIVER, COMMUNICATION MAY NOT BE ESTABLISHED.
The wireless transceiver emits four different colors of light to indicate which mode it is in.
They are:
Green - The transmitter is idle.
Red - It is communicating with the PC.
Blue - It is communicating with the Reader.
Purple - It is attempting to communicate with the Reader.
Page 50 of 62
CABLE CONNECTOR

OPERATOR'S MANUAL FOR THE SYSTEM
If the RS-232 cable provided is not long enough to connect the transceiver to your
computer, you can extend it by using the Reader-to-PC cable (15 meters/50 feet long) as
shown in Figure 3-3: Equipment Set-up for a Wireless Connection. For LAN Connection,
please see Section 3.6.3.
TRANSCEIVER
TRANSCEIVER CABLE
Figure 5-8: Extension of Transceiver-Reader Cable
6 MOBILEMOSFET SYSTEM MESSAGES
SATURATED – Will appear on the PC after an operation if the dosimeter
has acquired an accumulated dose that exceeds the
reading capability of this instrument. The dosimeter must
be replaced, and the Reader will not display dose
information for the depleted dosimeter.
ABSENT - Will appear on an operation if no dosimeter is connected to
the Reader on the respective channel.
UN-INITIALIZED – Will appear during a read operation when a dosimeter has
failed to be initialized.
BATTERY ICON – A battery icon is displayed on the PC to indicate the power
status of the Reader's battery.
DOSIMETER CONFLICT – A pop-up window will be displayed if MOSFETs and a
MOSFET Linear Array are BOTH connected to the
mobileMOSFET Reader.
Page 51 of 62
COMPUTER
READER-TO-PC CABLE
(15 METERS/50 FEET)

OPERATOR'S MANUAL FOR THE SYSTEM
7 CALIBRATION PROCEDURE
To obtain the maximum measurement accuracy, dosimeters should be calibrated prior
to the first measurement, and also after any lengthy period of not being used.
Calibration is performed by measuring the radiation sensitivity of the dosimeter under
known conditions. The dosimeter is placed under a radiation beam at a specified dose
level, and the output voltage of the dosimeter is then compared with the set level. The
ratio of the measured voltage value to the actual value of the radiation dose determines
the calibration factor. To improve the accuracy of the calibration procedure, the
measurement should be performed several times and the average value of the
calibration factor calculated. Because the radiation level varies sharply close to the
air/medium interface, it is also recommended that “build-up caps” are employed during
the calibration procedure to obtain maximum accuracy and repeatability.
This process will result in calibration factors which are almost independent of modality
or energy (>1MV or >1MeV). This energy independence also holds true when the
dosimeters are used on patients (see the list of publications available from Best
Medical Canada Ltd at www.TeamBest.com)
Once calibrated, the dosimeter may be used to measure doses at specific sites, e.g.
dose under bolus, under an immobilization device, or scatter dose to the eye. The
calibration factor determined for full build-up is used under these circumstances.
There are situations where other types of dose information are required and a different
calibration approach may be needed. One example is the determination of entrance
and exit doses; another is calibrating for Brachytherapy. Best Medical Canada Ltd
maintains an updated record of published information on this and other applications
which may be of use to the operator.
It is very important that the user designate the correct type of Linear Array being used
as well as the Bias selection (Standard or High) to allow the software to properly
calculate and correct the CFs.
Note: Brachytherapy/Linear Array – For additional calibration information on calibrating
for brachytherapy, especially using the Linear Array, please see Section 7.2.
Page 52 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
7.1 CALIBRATION METHODS FOR RADIOTHERAPY USING THE MOBILEMOSFET
SOFTWARE AIDED CALIBRATION TOOL
The mobileMOSFET Software provides a facility to simplify the calibration of MOSFET
dosimeters.
Note 1: To use more than one mobileMOSFET Reader at the same time, simply
click on the menu File/Add Calibration Window.
Note 2: As a means of becoming familiar with the Calibration Procedure, you may
also select Simulation Mode from the Setup dialog in the right hand corner
of the screen.
Figure 7-1: Calibration Window
From the Equipment Setup Screen click the drop-down menu item. A “Calibration”
window will pop up as shown in Figure 7-1: Calibration Window. This is the user
interface for the software tool to calibrate the MOSFET dosimeters. This tool helps
you record dose data, calculate the CFs for each dosimeter, get averaged CF values
after multiple readings, calculate deviations to determine whether to accept the
obtained CF values, and save, print and apply the results. It is important that the
correct type of MOSFET and Bias Setting are selected when configuring the
Calibration Setup screen.
Page 53 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
The Dose can be delivered to dosimeters by two methods:
Uniform: This choice allows you to apply one expected dose, e.g.
200cGy, and it will apply to all dosimeters.
Designate: Apply different expected dose values to each dosimeter.
The calibration procedure is as follows:
A. Set up the system as described in Section 3, SYSTEM SET-UP. Ensure that the
Bias Sensitivity switch on the Reader Module is set to the desired setting as per
Section 3.3 and that the dosimeter(s) to be used has been identified.
B. Run the mobileMOSFET Software. Turn on the Reader. Connect and check that
the Software CFs are set to the default of 1.00 mV/cGy and that the CRs are set
to 1.00. Next, confirm that the dosimeters have been connected as outlined in
Section 3.4.
C. Using a low-adhesive tape, (e.g. 3M paper tape sample supplied with unit) attach
the dosimeters to a block of backscatter material. If build-up is to be used, place
the required amount of build-up material on top of the flat face of the dosimeter.
Although the dosimeters are isotropic, there is a ±2% difference in response from
the front to the back. After calibration, the dosimeters should be applied to the
patient in the same orientation to the beam as when calibrated. See Section 7.3
below for further information on Build-up.
D. Place the dosimeters near the center of a radiation beam of desired energy, with
the build-up material and the flat side of the dosimeters facing the beam for high
energy radiotherapy doses (>1MV). An ionization chamber or a LINAC’s
internal monitor chamber may be used to measure a known dose and the
beam field size should be recorded for future reference.
E. Click on Start button to initialize MOSFETs before irradiation.
F. Irradiate dosimeters.
G. After irradiation click the READ button to measure results.
H. Enter the obtained dose value.
I. Click “Accept” to store the obtained CFs to “Raw CF Pool”.
J. Repeat steps E – I at least 3 times, to optimize reproducibility by averaging.
K. Review the Final CFs (averaged from the Raw CF Pool). If they are acceptable,
click on the boxes in the CF Acceptance. You may then apply Save and/or Print
the calibration results.
CF Calculation is based on the following:
MOSFET mV Reading (mV)
CF = KNOWN RADIATION VALUE (e.g. cGy/R/Gy)
Page 54 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
7.2 CALIBRATION OF MOSFET AND LINEAR 5ive ARRAY MOSFET DOSIMETERS:
GUIDELINES FOR DIFFERENT ENERGIES
(e.g. BRACHYTHERAPY)
Disclaimer: All of the information and methods described in Section 7.2 are for
reference only. For proper calibration and to account for the different radiation
processes at different radiation energies and modalities, it is strongly advised to refer
to detailed dosimetry methods as described in literature, (e.g. Introduction to
Radiological Physics and Radiation Dosimetry by Frank H. Attix, John Wiley & Sons).
CALIBRATION AT DIFFERENT ENERGIES:
A) High energy beams (1 MeV~18 MeV):
The MOSFETs do not show energy variations of CFs for high energy beams
(1MeV -18MeV) for electron and photon modalities. Indeed this variation is within 3
% at Dmax for this energy spectrum. Effects linked to different electron
contamination at high energy beams, Linac Make dependent, may induce
variations in CFs . It is then advised to calibrate MOSFETs in every Linac and for
the energies of interest. Data sheets of typical CFs, measured for different Single
and Linear Array MOSFETs at Co-60 beams, under 6mm build-up, are available
for reference.
B) Cesium sources (0.662 MeV):
The Cesium-137, with a main energy spectrum centered around 0.662 MeV
provides a response close to the one obtained using Co-60. Only few percent of
CF variation could be observed at this energy. To calibrate the MOSFETs, a small
amount of build-up is needed, in the range of 3-6mm, to account for the electronic
equilibrium.
C) Iridium sources (380 keV):
Iridium-192 is widely used in High Dose Rate (HDR) Brachytherapy. Its average
energy is around 380 keV. This spectrum contains low energy components below
100 keV, which increase the MOSFET sensitivity as a result of enhanced
photoelectric effect (~ Z 4 ) on the MOSFET active area made of SiO2. As for the
MOSFET response with Ir-192, it increases by a factor of approximately 1.2 from
the CF values obtained with Co-60.
For calibration of the MOSFETs, it is advised to put the source catheter in the
middle of a wide solid water block material (30cm wide, 5cm thick), and lay the
MOSFET parallel to the source catheter at a distance of 5-10cm (to avoid steep
gradient variation of dose at the vicinity of the source). Then protective bolus and
solid water bloc is used to cover the MOSFETs and source catheter to account for
dose scattering contribution.
Note: Caution must be used to ensure that the dosimeter(s) do not get crushed.
If a heavy piece of build-up must be used, please ensure that it contains a
customized groove for the MOSFET or a soft piece of Bolus is placed on top of the
Page 55 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
dosimeter(s) in order to cushion it and prevent breakage.*. Reference Section 5.4
on dosimeter care.
Using treatment planning software, and the actual source activity, source position,
and dwell time, dose can be estimated within the vicinity of the source, particularly
at the position of the MOSFET of interest. This will enable the calibration of any
MOSFET or Linear Array dosimeter. For the individual calibration of the 5
MOSFETs of the Linear Array, it is advised to move the source in its catheter by
steps of 2cm, and ensure that it is vertical to every single array MOSFET, to avoid
source anisotropy effects. In general, 3 short exposures of 30-50 cGy can be
applied to every MOSFET to obtain its CF.
Another variation for calibration is to use a water tank with 2 parallel jigs at a fixed
distance; one jig holding the Linear Array, and the other the source catheter. In
this case a calibrated ionization chamber can be also placed at the same distance
from the source to allow for absolute dose estimation.
D) Iodine source (30 keV):
Iodine-125 seeds are widely used in Low Dose Rate (LDR) Brachytherapy. The
energy spectrum is centered around 30 keV. Due to the photoelectric effect on
Silicon, the MOSFET response can increase by a factor of 3-4 from its response at
Cobalt energy.
Two approaches can be used for calibration:
- An orthovoltage X-ray machine can be used to simulate the 30 keV energy
response. As the average energy of an X-ray spectrum is a third of the tube's
maximum electron energy (given by the kilovolt setting), a setting of 90-100 kV
of the X-ray tube can be used to obtain the MOSFET response at 30 keV. A flat
ionization chamber should be used to estimate the absolute dose under 1-2cm
build-up (to account for photon scattering). The tube filtering and spectrum
modification should be checked before performing this operation, as filtered
beams tend to provide lower average energies than expected (1/3).
- An Iodine seed can also be used for absolute and fine calibration. This requires
a special phantom*, in which the seed is inserted with the MOSFET (in a
machined groove) underneath the seed by 2-4cm. As seed activity is weak,
several minutes (15-30 minutes) will be required to record a significant dose
reading in mV on the MOSFETs. Using the activity of the seed given by the
respective manufacturer and following the guidelines of dose calculation from
TG-43 protocol (or suitable software), dose can be estimated at the MOSFET
position, allowing exact CF estimation. An ionization chamber can be also used
for dose estimation at the MOSFET position; however its large volume may not
provide the spatial resolution needed.
*Contact Best Medical Canada Ltd or your phantom manufacturer for MOSFET
groove dimensions and tolerances.
Page 56 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
7.3 BUILD-UP & PARTIAL BUILD-UP
Because the interface between skin and air, or any backscatter medium and air,
provides a region of rapidly varying dose levels, it is often appropriate to use build-up
on the MOSFET. (The MOSFET has 0.8 mm inherent build-up.) This build-up is
usually a hemispherical device which fits over the MOSFET and allows the simulation
of the performance of the MOSFET at a defined depth (2 cm x 2 cm² bolus is also
used). The use of build-up allows a more accurate measurement of the radiation
level. Best Medical Canada Ltd supplies a brass hemispherical build-up cap that
covers all Photon energies as well as 15 and 18 MeV Electrons. A 1.5 cm water
equivalent build-up cap is available for the lower Electron energies, should build-up be
a requirement. (Go to www.TeamBest.com for more details).
There are situations where it is intended to verify the Dmax (maximum level on the
dose-depth curve) at the prescription point on a patient. Full build-up would, in
principle, be used on the dosimeter. However, it is not always recommended that full
build-up be used on dosimeters placed on a patient. The reason for this is that the
additional build-up material would perturb the depth-dose on the patient. Physicists
using the MOSFET system for patient QA dosimetry frequently use partial build-up for
these circumstances. For example, 1 cm of bolus is used at 6 MV, 2 cm at all higher
photon energies (see the list of publications available from Best Medical Canada Ltd).
In these situations of partial build-up, correction factors should be derived to
determine the relationship between the dose at partial build-up and at the Dmax.
7.4 CALIBRATION FOR DIAGNOSTIC X-RAY ENERGIES
Calibrations should be carried out as described above for Radiotherapy EXCEPT that
the black bulb side of the dosimeters should face the beam for low energy
radiography doses (

OPERATOR'S MANUAL FOR THE SYSTEM
7.5 TESTING A DOSIMETER FOR FADE (CHANGE IN PERFORMANCE)
The dosimeters will generally maintain their calibration for 12 months. However, due
to lack of use, the fade component may increase to >3%. To verify if your dosimeters
are within the specification, perform the following procedure:
A. Connect the dosimeter(s) to a fully charged mobileMOSFET Reader and allow it to
remain connected for at least one (1) hour before performing the test. Connect the
system as described in Section 3.0, SYSTEM SET-UP. Turn the Reader “ON” and allow
the system to warm-up for fifteen (15) minutes.
B. Press the START switch to initialize the dosimeters, then irradiate the dosimeters as
described in Section 7.0 CALIBRATION PROCEDURE, to a dose of approximately
200mV. START the dosimeter within one minute of irradiation and record the result from
the PC (Reader’s messages) for the sensor in question (X0).
C. Wait fifteen (15) minutes then press “START” and record the dosimeter result from the
PC (Reader’s messages) for the sensor in question (X15) again. Compare the initial
reading of each dosimeter (X0) to its final reading (X15), and use the following
calculation to determine the current fade of the dosimeter:
| X15 mV – X0 mV| * 100%
|F| = D mV
The operator can make a determination of use for any dosimeter showing fade
greater than 3%. If there is any doubt, please contact the manufacturer or the
representative in your area.
Page 58 of 62

8 MAINTENANCE
OPERATOR'S MANUAL FOR THE SYSTEM
8.1 mobileMOSFET BATTERY MAINTENANCE AND REPLACEMENT
The mobileMOSFET uses long life rechargeable NiMH batteries. NiMH should retain
their characteristics for a period of 5 years (battery performance may degrade after
this time depending on use). If the battery performance degrades, it is recommended
that they be replaced.
Contact Best Medical Canada Ltd to order a replacement battery pack for the Reader,
and follow this procedure for battery replacement:
A. Ensure the unit is powered off and the power adaptor is not connected to the
mobileMOSFET.
B. Remove the four screws from the bottom of the Reader, and remove the Reader’s case
to access the battery pack.
C. Note the battery pack's orientation in the Reader, as well as the placement of the cables.
Figure 8-1: Battery Pack Placement
D. Disconnect the battery power connector and remove the old battery pack (note that it is
attached with Velcro, so there will be some resistance).
E. Connect the new battery pack, and reassemble the unit.
F. Prior to first use, switch the power switch all the way ON (momentary position). Ensure
that the green LED is flashing (indicates that the power is on).
G. Switch the power OFF, then connect the external power supply. The red LED indicates
that the unit is in Fast Charge (reference. Section 3.2). When the red LED goes off and
the green LED illuminates (Trickle Charge), the unit is fully charge (maximum of three
hours).
Page 59 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
8.2 ORDERING REPLACEMENT PARTS
Best Medical Canada Ltd maintains a complete inventory of all normal replaceable
parts.
To place an order or obtain information concerning parts, contact your Best Medical
Canada Ltd representative or the manufacturer directly.
When ordering parts, include the following information:
1. Instrument Model Number
2. Instrument Serial Number
3. Part Description
4. Part Number
Page 60 of 62

OPERATOR'S MANUAL FOR THE SYSTEM
8.3 TECHNICAL SPECIFICATIONS
Technical specifications for the mobileMOSFET System using the TN-502RD series
dosimeter. (Higher sensitivity dosimeters (TN-1002RD series) as well as Linear
Array dosimeters (TN-LA5 series) are available on request.).)
Accuracy
Accuracy relative to an absolute source
is determined during calibration by the
user. Dosimeter accuracy over its dose
life is approximately four percent.
Recalibration every 7,000 millivolts, or
equivalent accumulated exposure, will
maintain this accuracy.
Sensitivity for Standard
TN-502RD Dosimeters (typical values)
Under full buildup: (energies ≥ 1MeV)
1 mV/cGy for Standard Bias Setting.
2.7 mV/cGy for High Sensitivity Bias
Setting.
Diagnostic X-ray energies:
9 mV/R for High Sensitivity Bias Setting.
Resolution and Capacity
The System records MOSFET voltage up
to 20,000 mV with 0.01 mV resolution.
The display is autoranging to keep
appropriate precision.
Dose Range
20,000 cGy for Standard Bias Setting.
7,000 cGy for High Sensitivity Bias
Setting.
Page 61 of 62
Reader Long Term Stability
Reader stability error is less than one
percent of maximum accumulated dose,
±1 mV, over one year.
Reader Linearity
Linearity error is less than 1% of the total
dose reading, ±1 mV, over the full dose
range.
System Dose to Dose Reproducibility
(at 68% confidence using 60 Co).
DOSE
Angular Dependence
The error resulting from irradiating the
dosimeter under full build-up with beam
energies of 1 MeV to 20 MeV at any
angle is ±2% through 360 degrees of
rotation.
Dosimeter Shelf Life
BIAS SUPPLY
SENSITIVITY
HIGH STANDAR
D
200 cGy

OPERATOR'S MANUAL FOR THE SYSTEM
Fade
20 hours with readings
every 5 minutes.
Battery Re-charge Time: