Dosimetrist/Physicist Training Guide - UCSF Radiation Oncology

MOSAIQ Dosimetrist/Physicist Training Guide Module I
Notes
Figure 86: Treatment Field Definition with Beam Information
Manually Adding Geometric Settings
Most of the time, you will get treatment field geometric settings from the treatment
planning system that you use. Sometimes you may have to add the geometric settings
manually. In this exercise, you will manually add geometric settings such as the beam,
gantry, collimator, and couch settings for your new treatment field.
1. In the Treatment Field Definition dialog box, type 345 in the Gantry Angle field.
Specifies the gantry angle.
2 Type 10 in the Field Size X field.
Specifies the size of the X jaws, width, and length.
3. Type 12 in the Field Size Y field.
Specifies the size of the Y jaws. For this exercise, the X and Y jaws are the same
dimensions, so keep the two Asy checkboxes at their defaults. The Asy
checkboxes specify that the jaw sizes are asymmetrical. If you clicked one or both
of the checkboxes, the jaw size fields for that jaw become active. You then add
the individual jaw values.
4. In the Couch group, type 125 in the Longitudinal field.
Specifies the longitudinal couch angle, which is necessary for EXCI Varian linear
accelerators, shown in Figure 87.
104 Copyright 2009, IMPAC Medical Systems
LTGRAD0005A/2.0/26-Feb-2009