Dosimetrist/Physicist Training Guide - UCSF Radiation Oncology
Dosimetrist/Physicist Training Guide - UCSF Radiation Oncology
Dosimetrist/Physicist Training Guide - UCSF Radiation Oncology
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Lesson 3: Adding Simulation and Treatment Fields<br />
Copyright 2009, IMPAC Medical Systems 99<br />
LTGRAD0005A/2.0/26-Feb-2009<br />
Notes Using the Apply Limits Option<br />
The Apply Limits option lets you correct out-of-bounds parameters for the Gantry<br />
angle, Collimator angle, MLC, Field size X/Y, and Jaws X1, X2, Y1, and Y2. If one or<br />
more of these field parameters exceeds the machine limits as defined in the Machine<br />
Characterization in MOSAIQ, the Positional Limits Exceeded message opens. In this<br />
exercise, you will apply the Apply Limits option.<br />
The Positional Limit Exceeded message shows different<br />
messages based on the task you are doing when you exceed<br />
the positional limits.<br />
If you use the Apply Limits option, make sure that your<br />
clinical staff verifies all changes.<br />
1. In the Diagnoses and Interventions window, double-click 1 - Lt. AP Lung.<br />
Opens the Treatment Field Definition dialog box for the selected treatment field.<br />
2. Change one or two geometric settings so that they are out of bounds.<br />
Makes sure that the message box appears.<br />
3. Right-click in the Treatment Field Definition dialog box or press F4.<br />
Opens the Treatment Field Definition Options menu, shown in Figure 80.<br />
4. Click Apply Limits.<br />
Figure 80: Treatment Field Definition Options Menu<br />
Closes the Treatment Field Definition Options menu and opens the Positional<br />
Limit Exceeded message box, shown in Figure 81.