Operator's Manual Model OBC Open Breast Array Coil for ... - Invivo

Operator's Manual 

Model OBC 

Invivo Corporation 


Open Breast Array Coil for 

GE Signa System 

500018 Rev 07 

1

500018 Rev 07 

February 2000 

©2000 Invivo Corporation 

All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a 

retrieval system, or translated into any language in any form by any means without the written permission of 

Invivo Corporation. 

Licenses and Trademarks 

The Invivo logo is a registered trademark of Invivo Corporation. 

Signa System is a registered trademark of the General Electric Company. 

This manual describes the use and operation for the Open Breast Array Coil on G.E. Signa 1.5T and 1.0T 

MRI Systems. 

Proper performance of this coil is guaranteed only while the coil is being used on the MR system (hardware/ 

software level) specified at the time of purchase. Upgrades or other modifications to the system software 

and/or hardware may affect compatibility. Prior to upgrading your MR system, please contact your Invivo 

representative to discuss coil compatibility issues. Failure to do so may void your warranty. 

2 

Attention, Consult Accompanying 

Documents 

Type BF Equipment 

Class II Equipment 

Caution: 

Federal law restricts this device to sale, 

distribution, and use by or on the order of a 

physician. 

Introduction 

NOTICE: 

TRANSPORT AND STORE THIS PRODUCT UNDER 

THE FOLLOWING ENVIRONMENTAL CONDITIONS 

ONLY, FOR A PERIOD NOT EXCEEDING 4 WEEKS: 

AMBIENT TEMPERATURE OF -40°C to +60°C 

RELATIVE HUMIDITY OF 10% TO 100% (Non- 

Condensing) 

ATMOSPHERIC PRESSURE ON 765 hPa TO 1011 hPa 

WARNING: This product contains chemicals, including 

lead, known to the state of California to cause birth 

defects or other reproductive harm. Wash hands after 

handling. 

This manual describes the safety precautions, features, use, and care of the 

Open Breast Array Coil, compatible with the GE Signa MRI System. Please 

review this manual thoroughly before using the device. 

If you have any questions or comments on this manual, or need any assistance 

with the use of the product, please contact your Invivo representative: 

1-800-524-1476 


Model OBC

Table of Contents 

Manufacturer: 


3545 SW 47th Avenue 

Gainesville, FL 32608 

U.S.A. 

Phone: (352) 336-0010 

Fax: (352) 336-1410 

Web: www.invivocorp.com 

E-mail: info@invivocorp.com 



500018 Rev 07 

Open Breast Array Coil Components....................................................... 4 

Chapter 1 - Patient Safety ......................................................................... 5 

Training ...................................................................................................... 5 

Indications ................................................................................................. 5 

Contraindications ....................................................................................... 5 

Precautions ................................................................................................ 5 

Cautions ..................................................................................................... 5 

Emergency Procedures ............................................................................. 7 

Technical Considerations .......................................................................... 7 

Chapter 2 - Quality Assurance .................................................................. 8 

Quality Assurance ..................................................................................... 8 

Chapter 3- Using the OBC Coil ................................................................. 9 

Positioning the Open Breast coil on the Patient Cradle ............................. 9 

Establishing the Patient LANDMARK ...................................................... 10 

Connecting the Cable .............................................................................. 10 

Field of View and Coverage ..................................................................... 10 

Selecting the Active Coil.......................................................................... 11 

Ramp and Sternum Pads ......................................................................... 11 

Chapter 4- Scanning ................................................................................ 12 

Auto Prescan ........................................................................................... 12 

Localizing With the GE Signa Body Coil.................................................. 12 

Using Autoshim...................................................................................12 

Suggested Scan Protocols ..................................................................... 13 

TI Time Check Procedure ........................................................................ 16 

5X Software ............................................................................................. 16 

SNR Imbalance in Bilateral Breast Coils ................................................. 17 

Chapter 5- Installation and Maintenance ............................................... 19 

Config File Information............................................................................. 19 

Adding OBC Softkeys .............................................................................. 19 

Cleaning ................................................................................................... 21 

For Sales and Service 

in Europe: 

Invivo Germany GmbH 

Schweinfurter Strasse 28 

97076, Würzburg 

Germany 

Phone: +49 (0)931 359 76-0 

Fax: +49 (0)931 359 76-10 

Authorized Representative in Europe: 

GBM Authorised Representative Ltd. 

The White House, 2 Meadrow 

Godalming, Surrey GU7 3HN 

United Kingdom 

Phone: 44 (0) 7710 039721 

Fax: 44 1483 424 310 

Web: www.mba-gbm.com 

E-mail: martin.biggs@mba-gbm.com 

3

500018 Rev 07 

4 

Open Breast Array Coil 

Components 

Your Open Breast Array Coil package consists of the following parts. Please inspect the package upon receipt 

to make sure all parts are present and in good order. Use this guide to refer to part names throughout this manual. 

Ramp Pad 

Operator's 

Manual 

Sternum Pad 

OBC-63-PA 



Chapter 1 - Patient Safety 

Training 

Quality 

Assurance 

Indications 

Contraindications 

Precautions 

Cautions 



500018 Rev 07 

This manual contains detailed information on the setup, positioning and use of the 

Invivo Corporation coil. Read the insructions carefully and thoroughly before 

attempting to scan patients with the coil. 

The procedure described in the Quality Assurance Section of this manual should be 

performed upon receipt of the coil to establish a baseline of coil performance. The 

procedure should be repeated at regular intervals. 

The coil is indicated for use, on the order of a physician, in conjunction with an MR 

scanner as an accessory to produce images of the breast. 

The operator should be aware of the following contraindications for use related to the 

strong magnetic field of the MR system: 

Scanning is contraindicated for patients who have electrically, magnetically or 

mechanically activated implants (for example. cardiac pacemakers). The 

magnetic and electromagnetic fields produced by the MR System and coil may 

interfere with the operations of these devices. 

Scanning patients with intracranial aneurysm clips is contraindicated. 

Precautions should be taken when scanning patients with the following conditions: 

Greater than normal potential for cardiac arrest 

Increased likelihood for developing seizures or claustrophobia 

Unconscious, heavily sedated, or confused physical or mental state 

Inability to maintain reliable communications 

The following general warning statements apply to scanning with a magnetic 

resonance system. For further details, review the warnings in your MR system 

Operators Manual. 

Do not cross or loop cables. Arcing and patient burns could result. Route 

cables out of the magnet so that they do not touch the patient. 

5

500018 Rev 07 

6 

Ensure that the patient does not form a loop with any 

body parts. For breast coils in particular, patients are 

imaged lying prone with both arms extended above 

the head (superman). Do not allow patients to 

touch any part of the right hand or arm to any part 

of the left hand or arm. The loop formed by doing 

so could cause an RF burn at the point of contact. 

Use pads to ensure the patient’s hands do not 

touch any metal features of the patient table or 

cradle. Be sure to educate the patient accordingly 

and check the patient’s position immediately before 

the scan. 

Assure that the patient is not touching the bore. If necessary, place pads 

between the patient and the surface of the bore. 

If the patient complains of warming, tingling, stinging, or similar sensations, 

promptly stop the scan procedure, examine the patient, and contact the 

responsible physician before continuing the procedure. Pay special 

attention to very young, sedated, or other compromised patients who may 

not be able to communicate effectively. 

Patients with ferromagnetic metal should not be scanned because the 

magnetic field may interact with implanted surgical clips or other ferromagnetic 

materials. 

Persons with cardiac pacemakers or other implanted electronic devices 

should not enter the magnetic field zone delineated by the MR system 

manufacturer. 

There is a risk to scanning feverish or decompensated cardiac patients. 

Facial makeup should be removed before scanning because it may contain 

metal flakes which can cause skin and eye irritation. Permanent eyeliner 

tattoos may cause eye irritation due to ferromagnetic particles. 

Patients who work in environments in which there is a risk of having 

embedded metallic fragments in or near the eye should be carefully 

screened before undergoing an MR exam. 



Emergency 

Procedures 

Technical 

Considerations 



Visually inspect the cable insulator jackets, 

strain reliefs and connector boxes before 

each use. If the insulation is broken, or if the 

cable is frayed, immediately discontinue 

use of the device. 

500018 Rev 07 

In the unlikely event that a coil creates smoke, sparks, or makes an unusually loud 

noise, or if the patient requires emergency assistance: 

• Stop the scan if one is in progress. 

• Remove the patient from the scan room if medical treatment is needed. 

The coil and accessories require special conditions regarding 

electromagnetic compatibility. The coil must be installed and used in a 

shielded scan room provided with the MR magnet and system. The user 

must ensure that the scan room door is closed during system use. Failure 

to do so may cause reciprocal interference with portable and mobile RF 

communications equipment, affecting the performance of the MR coil and/ 

or such equipment. 

The coil should only be used with the accessories specified in the operator’s 

manual. 

The use of accessories other than those specified in the operator’s manual 

may result in decreased ESD immunity of the coil or MR system, causing 

damage to the coil and/or system. 

The equipment should not be used with other coils or equipment present in 

the MR scanner except as specified in the Operator’s Manual. 

Tampering with the cable pins and connector may damage the connector 

and affect coil or system performance. Please verify that connector and 

pins are not damaged before use. 

7

500018 Rev 07 

Chapter 2 - Quality Assurance 

Quality 

Assurance 

8 

Using the 4.38-inch 

diameter sphere 

phantom, scan using 

the protocol shown. 

If the image appears as 

shown, the OBC coil is 

malfunctioning. 

Discontinue use of the 

coil and call your MR 

system service 

representative 

Be sure that you have chosen the correct coil, and activate the desired coil(s) from 

the menu selection on the surface coil screen. The coil(s) chosen must be 

R_BREAST, L_BREAST, or 2_BREAST. 

Position the Breast Coil in the center of the patient cradle. Place two phantom 

holders and two 4.38" diameter sphere phantoms (provided with your Signa 

System, part number 46-317586G1) in the left and right coil. Activate one of the 

above coil settings from your operator's console. 

Use the following spin echo sequence, TE=20 mS., TR=300 mS., 32 cm. FOV axial, 

5 mm. thick, 5 mm. spacing, 256x128, and one average or equivalent sequence. 

Scan using Auto Prescan. If Auto Prescan does not complete successfully, do not 

use the coil clinically. Upon completion of prescan, execute the scan. Window the 

scan as you normally would (window levels vary from system to system depending 

upon your hardware revision level). The scan should appear uniform. 

If the image has signal voids, distortions, or black streaks, discontinue use of the 

coil. If the image is excessively noisy, repeat the scan using the GE 5-inch general 

purpose coil for 1.5T or an alternate coil for 1.0T supplied with your system. If the 

5-inch coil image or alternate coil image exhibits similar artifacts, the problem 

likely lies with the MRI system. 

Mode : Multi 

PSeq: ME 

TR: 300 

TE: 12.0 1/1 

256x128/1.0 NEX 

FOV: 14 cm. 

Thk: 10.0 mm . 

Imgs: 5/00:42 



Chapter 3 - Using the OBC Coil 

Positioning 

the Open 

Breast Coil 

on the 

Patient 

Cradle 

Positioning 

the Patient 



500018 Rev 07 

The Open Breast Coil is designed for unilateral imaging of the left or right breast, 

or bilateral imaging of both breasts. 

The coil is designed to rest directly on the patient cradle. It is important that the 

coil lies directly on the patient cradle, since this will elevate the patient's breast 

to iso-center of the coronal scan plane. The Signa system with 4x software allows 

a scan offset in only one direction. Since the breast is already offset in the lateral 

direction, it is important that the anterior/posterior (A/P) location of the coil is at 

zero (in the coronal plane). 

If some foreign object (sheet, strap, etc.) is beneath the coil housing, the coil may 

move during the image acquisition, resulting in motion artifact. The coil must be 

placed on the patient cradle with the cable oriented into the magnet. 

The Open Breast coil is designed for feet-first exams only! 

Place the Open Breast Coil on 

the patient cradle with the cable 

directed towards the magnet. 

The Open Breast coil must be placed near the handle end of the patient cradle in 

order for the patient to enter the scanner feet first. 

Position the patient prone, centering breasts in the apertures of the coil. Use the 

open lateral side of the coil to visually center the breast in the coil. Adjust the 

cradle laterally so that a scanned breast may be placed in the center of the 

magnet. Ask the patient to move slightly superior or inferior until the breast is 

centered in the aperture. A pillow is best for supporting the patient's head and 

arms during the scan. 

Ensure that the patient does not form a loop with any 

body parts. For breast coils in particular, patients are 

imaged lying prone with both arms extended above 

the head (superman). Do not allow patients to 

touch any part of the right hand or arm to any part 

of the left hand or arm. The loop formed by doing 

so could cause an RF burn at the point of contact. 

Use pads to ensure the patient’s hands do not 

touch any metal features of the patient table or 

cradle. Be sure to educate the patient accordingly 

and check the patient’s position immediately before 

the scan. 

9

500018 Rev 07 

Establishing 

the Patient 

LANDMARK 

Connecting 

the Cable 

Field of View 

and 

Coverage 

10 

Use the open lateral side of the coil to visually center the breast in the coil. Ask the 

patient to move slightly superior or inferior until the breast is centered in the 

aperture. 

The patient must be positioned feet first. 

The cable is connected to your system using a standard phased array plug. Plug 

the cable into the phased array port provided on your system. 

For unilateral imaging a FOV of 16 cm to 20 cm is suggested, depending upon 

breast size. The Open Breast coil aperture is 160 millimeters (16 cm) in 

diameter. If both coils are active, a field of view of 32 cm to 36 cm is 

suggested. You may use a smaller FOV if desired. It is recommended that the 

NO PHASE WRAP option be selected when establishing the scan parameters. 

See Chapter 3 for suggested scan protocols. 



Selecting the 

Active Coil 

Ramp and 

Sternum 

Pads 



500018 Rev 07 

The breast imaging platform contains both a left breast coil and a right breast coil. 

One or both coil(s) can be active at any given time. To select the active coil(s), 

pick the proper selection from the coil selection screen on your plasma display. 

Set-up of the soft key selections for the Open Breast Array Coil are described in 

Chapter 4 of this manual. 

For patient comfort, a ramp pad and sternum pad have been provided. The ramp 

pad attaches to the OBC-63 PA Breast platform with velcro fasteners. The lower 

end of the ramp pad fits flush with GE Signa cradle pads. 

The sternum pad attaches to the top of the OBC-63 PA Breast platform with 

velcro fasteners. Center the sternum pad openings over the apertures of the 

breast platform and secure. 

If ramp or sternum pad become soiled, they may be cleaned easily with a solution 

of 30% isopropyl alcohol and 70% tap water. 

11

500018 Rev 07 

Chapter 4 - Scanning 

Auto Prescan 

Localizing 

With the 

Body Coil 

IMPORTANT! 

Using 

Autoshim 

12 

Generally, the Signa System auto prescan will function normally when used with 

the open breast array coil. If auto prescan returns the message "auto prescan 

failed to complete normally", then manual prescan may be required to acquire the 

image. Consult your GE Signa operator's manual for manual prescan procedures. 

If a TR DRIVER FAULT occurs, then reseat the cable and try again. If the fault 

recurs, then it is likely the wrong coil selection was chosen at the coil menu. If 

the problem persists, call your GE Service Representative. 

The open breast array coil is designed to allow the Signa body coil to be used at 

any time while the open breast coil is in the scanner. This allows a large FOV (40 

cm) body coil localizer, which is helpful in determining the left or right offset 

required for imaging the breast. 

AUTOSHIM is a feature of 5X software AUTOPRESCAN to improve image 

quality. It does this by improving the magnetic field homogeneity within the FOV 

selected. The improvement in image quality is often dramatic when the selected 

FOV is far off center, and when acquiring FSE or T2 weighted scans. 

It is only recommended that autoshim be selected when operating this coil in the 

unilateral mode. For use in the bilateral mode, turn autoshim off. To use 

AUTOSHIM with the Open Breast Array Coil in the unilateral mode, use the 

following procedure: 

1. Begin a new exam. 

2. Choose L_BREAST or R_BREAST as the coil selection after it has been 

programmed on your system. This is a 1-channel selection. 

3. Make sure AUTOSHIM is selected. 

4. Run AUTOPRESCAN. 

5. Carry out a series of images for scout purposes, if desired. All subsequent 

scans will use these autoshim settings. 

6. When switching to the other breast, repeat steps 2-5. 



Suggested 

Scan 

Protocols 



3. Axial T2 FSE - Water Suppressed 

500018 Rev 07 

The following sagittal scan protocols have yielded good results when used with the open 

breast array coil . Of course, your site may have developed your own protocols which you 

prefer to use. 

1. Coronal / Localizer 

Figure FOV from #1 above * Only use one side of the coil. 

Turn off one side of the breast coil for any suppression 

sequence. 

18-20 cm. 

2D, FSE, Sat(w), NP, SPF, approx. 17-23 slices 

16 echo train, 1 echo, 170 TE, 4000 TR 

6mm, 1.0 gap 

256/256, 4 NEX Frequency A/P 

Center Frequency = FAT 

Suggested Scan Protocols 

Breast Implants/Leakage 

2D, MPGR, no options 

90 degree flip, 1 echo, minimum TE, 300 -400 TR 

40 FOV, 5mm, 2mm gap 

256/128, 1 NEX, Freq R/L, S/I P60/A20 

Center Frequency = Water 

From this figure out FOV for remaining sequences 

2. Axial/Sagittal T2 FSE 

Use graphic prescription and split slices to cover both breasts 

2D, FSE, NP, SPF, Grx 

TR 4000 

TE 170 1 echo, 16 echo train 

18-20 FOV, 5MM, 0.5 gap 

256/256, 2 NEX, Frequency A/P 


13

500018 Rev 07 

14 

4. This scan is used to get a better FAT SAT for the axial 

T1 FAT SAT. 

Use one side of the breast coil only! Uneven FAT suppression 

can result if both coils are receiving signal in the same 

acquisition. 

T1 Axial/Sagittal FAT SAT 

2D, SE, SAT(F), No Phase Wrap, Grx 

1 echo, TE minimum full, TR 300 

FOV (from #1) - One side only! , 6mm thick/ 1 mm skip 

256/192, 1 NEX, Frequency R/L 


5. When Fat and H 2 O signal are both removed for 

silicone visualization 

FIR - with water - SAT 

IR, SAT(W) , No Phase Wrap, Grx 

Fast 8ETL , TE: 60, TR: 5000-7000 

FOV: 20 cm. , 6mm thick / 1mm skip 

256/192, 2 NEX 

TI time around 140-170, check under manual prescan. 

(Procedure for checking the TI time for each patient is listed on 

page 15 of this manual). 

Gadolinium Contrast Study 

T1 with & without Fat SAT. One Side Only! 

2D, SE, NP, (SAT/F) 

TR 600, TE minimum full, 20 cm FOV 

6mm slice thickness, 1mm gap 

256/192 2NEX, frequency A/P 


Make sure scan parameters are identical for comparison 

with and without gadolinium 





Gadolinium Contrast Protocol 

FSPGR Multiphase 

Fast SPGR 

Pick two locations that show pathology 

2 Locations per aquisition / Interleaved 32 Phases 

TR: Min., TE: Min., FLIP: 35 

256x192 2-4 NEX 

22 cm. FOV 

500018 Rev 07 

Want scan time to be 3-5 min. long. 

Load each location separately into paging loop, 32 images in each. 

Watch uptake of gadolinium in selected slices. 

15

500018 Rev 07 

TI Time 

check 

4X Software 

5X Software 

16 

Procedure for checking TI time for inversion recovery to find correct TI time on 

4X Signa using manual prescan. 

Run Auto Prescan. 

Go into manual Prescan. Select CFA Fine. Type in "MIP(=modify image parameter). 

Type in a TI time value of 200 and look for the fat peak to grow (Peak on the right) 

Let the system have two passes and step down TI time in increments of ten. Let 

system make two complete knocking revolutions for each incremental drop of ten 

in the TI time (i.e. 190...180..170). Keep dropping TI time in increments of ten until 

the fat peak gets as flat as possible. 

The TI time number that you find that makes the fat peak as flat as possible will 

be used in the TI Time page in the protocol. Exit manual prescan. Go back to 

your protocol, and insert this patient's TI time value. Make sure that you haven't 

lost any slices because of the new TI time insertion. 

Go to the scan page to proceed with scan. Select Auto Prescan, then scan. 

Procedure for checking TI time for inversion recovery to find correct TI time on 

5X Signa using manual prescan. 

Run Auto Prescan. 

Go into manual Prescan. Select CFA Fine. Type in "mrsp(=modify real time 

system parameter). 

Type in a TI time value of 200 and look for the fat peak growth (peak on the right). 

Let the system have two passes and step-down TI time in increments of ten. Let 

the system make two complete knocking revolutions for each incremental drop of 

ten in the TI time (i.e. 190...180..170). Keep dropping TI time in increments of ten 

until the fat peak gets as flat as possible. 

The TI time number that you find that makes the fat peak as flat as possible will 

be used in the TI Time page in the protocol. Exit manual prescan. Go back to 

your protocol and insert this patient's TI time value. Make sure that you haven't 

lost any slices because of the new TI time insertion. 

Go to the scan page to proceed with the scan. Select Auto Prescan, then scan. 



SNR 

Imbalance in 

Bilateral 

Breast Coils 



by Randy Duensing, 6/4/99 

500018 Rev 07 

It has been shown that a linear coil produces considerable asymmetry when 

placed on a conducting sample (1-3). Linear body coils and linear surface coils 

show this effect. The basic rationale can be demonstrated with a simple model in 

which we employ the principal of reciprocity. Assume a surface coil is being 

driven near a lossy dielectric sample. 

field from 

coil 

field from 

induced 

currrent 

field from 

coil 

field from 

induced 

currrent 

Because the sample (biological tissue) has a complex permittivity, the current 

induced in the sample will not be perfectly out of phase from the coil source 

current. The NMR signal is sensitive to the net rotating magnetic field at any 

given point. In an unrealistic but simple and explanatory example, assume that 

the induced field is equal to the source field at the locations at which the drawn 

field lines cross, that the field lines are perpendicular at that point and that the 

induced current is 90 degrees out of phase with the source current. The result 

would be complete quadrature (root two higher SNR) on one side of the coil and 

complete anti-quadrature (zero SNR) at the other side of the coil. Of course the 

imbalance is usually much less than this with only partial quadrature effects. We 

see that although the coil is bilaterally symmetric and the sample is bilaterally 

symmetric, that the NMR signal is not bilaterally symmetric due to the rotating 

nature of the physical phenomenon. To confirm that the source of visualized 

imbalance is not due to coil imbalance, one can reverse the coil in the magnet 

and still the SNR will be higher on the same side of the magnet even though the 

coil has been reversed. 

17

500018 Rev 07 

18 

A phased array coil is generally made up of linear elements, each of which 

demonstrates spin sensitivity corresponding to the physical requirements of the 

NMR phenomenon and a lossy dielectric sample. The reconstruction algorithm 

employed for multiple channels maintains the SNR of each loop and therefore keeps 

the imbalance described above. The argument can be extended to multiple coils 

and on a breast coil, the effect can be quite noticeable. Consider the figure below 

which demonstrates the area of expected gain and loss with respect to two breasts. 

weaker 

brighter 

weaker 

brighter 

In addition to the surface coil effect locally in each breast, there is also a common 

mode induced current which extends throughout the body. This results in some 

overall SNR imbalance in addition to the local SNR patterns in each breast. Again, 

one can confirm that the difference in the two sides is primarily due to induced 

current and the NMR phenomenon by reversing the coil in the magnet. One finds 

that the coil on the opposite side now appears to be weaker, when it was stronger in 

the other orientation. 

1. Comparison of Linear and Circular Polarization for Magnetic Resonance Imaging, Glover, et al, 

Journal of Magnetic Resonance 64, 255-270 (1985) 

2. The Modification of the RF Field Distribution of Surface Coils by Weakly Conducting Saline 

Samples, Hanstock et al, Magnetic Resonance in Medicine 7, 204-209 (1988) 

Local Intensity Shift Artifact, Peter Wardenier, P. 1175, 1988 SMRM proceedings 





Cable Loss(float): 

Coil Loss (float): 

Recon Scale 

1.5T LX 1.5T Genesis 

60 cm. 

1.5T Genesis 

55 cm. 

1.05 

1.0T LX 

500018 Rev 07 

Chapter 5 - Installation and 

Maintenance 

Config File 

Information 

Adding a 

Softkey for 

the Open 

Breast Array 

Coil 

The configurations below are used for programming soft keys for the open breast 

array coil on the plasma display console. The selections are, in order, right 

breast, left breast, both breasts. Programming can easily be performed by your 

GE service engineer. 

Unilateral imaging is preferred when using FAT SAT, WATER SAT, or SILICONE 

SAT, since the saturation pulse sequences generally will not work well when the 

FOV encompasses both breasts, due to body coil inhomogeneities. By programming 

a plasma key for left breast and right breast, you are assured of using the 

appropriate channel for applying a saturation pulse during manual or auto 

prescan. 

Softkeys for the OBC Coil may be added on the LX console by accessing the Config 

File Manager from the Utilities window in the Service Desktop Manager area of your 

operator's screen. 

The screen is case sensitive; be sure to enter values as shown. The following 

information needs to be entered into the config file at the prompts on the screen: 

CoilName (8 characters or less): R_BREAST 

korecName (4 characters or less): Enter a space return 

CoilType (1-Head 2-Body 3-Surface): 3 enter 

Extremity Coil (yes, no): no 

1.05 

1.72 

1.05 

1.72 

1.56 1.56 

0.313 

1.56 

1.24 

0.549 

1.0T Genesis 

60 cm. 

1.24 

0.549 

1.282 1.282 

Linear vs Quadrature (0 or l): 1 

Multiple Receiver Coil? [yes, no]: yes 

Number of Receivers: 2 

Starting Receiver ID (integer): 2 

Ending Receiver ID (integer): 3 

Multi-Coil PortEnable (an integer): 2 

Multi-Coil ErrorEnable (an integer): 2 

Additional Transmit Attenuation (An integer from 1 to 100, units are tenths of dB): 0 

Number Fast Receiver: 0 

Starting Fast Receiver: 4 

Ending Fast Receiver: 4 

Fast TG Start TA: 90 

Fast TG Start RG: 12 

Multi-Coil Recon Enable: 0 

19

500018 Rev 07 

20 

CoilName (8 characters or less): L_BREAST 






Recon Scale 

1.5T LX 1.5T Genesis 

60 cm. 

1.05 

1.72 

1.05 

1.72 

1.56 1.56 

1.5T Genesis 

55 cm. 

1.05 

0.313 

1.56 

1.0T LX 

1.24 

0.549 

1.0T Genesis 

60 cm. 

1.24 

0.549 

1.282 1.282 















CoilName (8 characters or less): 2_BREAST 






Recon Scale 

1.5T LX 1.5T Genesis 1.5T Genesis 1.0T LX 1.0T Genesis 

1.05 

1.05 

1.72 

1.72 

1.56 1.56 

1.05 

0.313 

1.56 

1.24 

1.24 

0.549 

0.549 

1.282 1.282 

















Cleaning 



500018 Rev 07 

After changing the configuration file, the Signa system must be shut down 

and rebooted. 

Refer to the following GE Service Documentation to assure the most current 

config information. 

-2124201-3 (5.X) 

-2160623-3 (8.X) 

The Open Breast Array coil, Sternum pad, and Ramp pad may be cleaned by 

wiping the items with a cloth dampened with a solution of 30% isopropyl alcohol 

and 70% tap water. Do not pour any cleaning solution directly on the coil! 

Let coil housing and pads dry before use. 

21

500018 Rev 07 

22

Operator's Manual Model OBC Open Breast Array Coil for ... - Invivo

Create successful ePaper yourself

Delete template?

Save as template?