MOSAIQ User's Guide - UCSF Radiation Oncology
MOSAIQ User's Guide - UCSF Radiation Oncology
MOSAIQ User's Guide - UCSF Radiation Oncology
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<strong>MOSAIQ</strong> User’s <strong>Guide</strong><br />
CAUTION<br />
Offset Couch Calculator<br />
Valid Third Party Offsets must be within a time constrained by study<br />
date/time of image(s) ( +/- 60 minutes).<br />
When you specify a Prescribed Relative Offset, calculate an offset in <strong>MOSAIQ</strong>, or record a<br />
Third Party Offset, the Offset Couch Calculator feature calculates new couch targets. You<br />
have 10 minutes from the time at which you took the first image until you open the Offset<br />
Couch Calculator dialog box to calculate the Current + Average Session Offset. Right-click<br />
or press F4 in the Verified Treatment or Verified Port dialog box then click Calculate<br />
Offset Couch…. You have three options in the couch position group, which are explained<br />
in this section.<br />
The Current Option<br />
The Current option shows the position of the couch when you opened the Offset Couch<br />
Calculator dialog box.<br />
The Current + Total Offset Option<br />
The Current + Total Offset option shows the couch targets for moving the patient from<br />
marks into the setup position. You can do pre-treatment imaging or other patient positioning<br />
verification (PPV) after this step, or deliver the treatment.<br />
The Current + Average Session Offset<br />
The Current + Average Session Offset option shows the couch targets for moving the patient<br />
from the setup position to the treatment position. You can use any available PPV method.<br />
You must open the Offset Couch Calculator dialog box within 10 minutes of imaging or<br />
recording the session offset.<br />
After you adjust the couch, you can do positioning verification if required. If you want to<br />
take another set of images, you can open the Offset Couch Calculator dialog box again to<br />
calculate new couch positions.<br />
<strong>MOSAIQ</strong> averages multiple session offsets recorded within the 10 minutes and adjusts for<br />
differences in a shared plane (usually sup/inf). For example, if you took 2 planar images but<br />
registered them independently of one another. If the offsets include images taken at different<br />
couch settings, close and reopen the Offset Couch Calculator dialog box. In this case, you do<br />
not want to average the results. The initial offsets expire 10 minutes after taking the first<br />
image set.<br />
The Offset Couch Calculator is not available with the Varian 4DITC<br />
interface.<br />
212 Copyright 2010, Elekta Impac Software<br />
LUGMSQ0002/4.0/23-Sep-2010
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