Dosimetrist/Physicist Training Guide - UCSF Radiation Oncology

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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
Notes Lesson 3: Adding Simulation and Treatment Fields Copyright 2009, IMPAC Medical Systems 105 LTGRAD0005A/2.0/26-Feb-2009 Figure 87: Treatment Field with Geometric Settings 5. Use the right-click Apply Limits option if necessary. Makes sure the treatment field parameter sessions are correct for your machine. Manually Adding Accessory Information You can specify parameters for accessories such as wedges, compensators, and blocks. In this exercise, you will manually add information on accessories. 1. In the Treatment Field Definition dialog box, type or click None from the Wedge field. Specifies that the treatment field does not use a wedge. For this exercise, keep the Compensator field blank. The Compensator field identifies the type of compensator required for treatment. If you select electrons for the treatment modality, the Applicator field appears rather than the Wedge field. The drop-down list shows cones for the selected machine. 2. Type Cerro in the Block field. Specifies the type of block required for treatment. For this exercise, you will also keep the Bolus field blank. The Bolus field specifies the type of bolus required for treatment.
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Dosimetrist/Physicist Training Guide - UCSF Radiation Oncology

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