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MOSAIQ User's Guide - UCSF Radiation Oncology

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<strong>MOSAIQ</strong> User’s <strong>Guide</strong><br />

Digitizing a Treatment Field Shape<br />

While the verify and record system supports machines equipped with MLCs by automatically<br />

setting up leaf positions according to a pre-defined plan and recording their positions during<br />

treatment, MLC Fit streamlines the process by enabling you to generate the actual multileaf<br />

collimator data as well. Using MLC Fit, you can digitize treatment field shapes and generate<br />

MLC leaf plans using these digitized shapes. MLC Fit uses leaf, jaw, collimator, and gantry<br />

position information to specify geometry.<br />

For additional information on digitizing a treatment field, Chapter 6, Image Management —<br />

ViewStation & Photos and Diagrams, on page 139.<br />

Graphical Elements and Controls<br />

The following display conventions are followed:<br />

Green the leaves<br />

Yellow the treatment field shape<br />

Turquoise the jaws<br />

Blue the leaf currently active for editing<br />

Dark Blue Leading Edge the jaw currently active for editing<br />

Red the isocenter crosshairs<br />

Window and Level Control Use to adjust the darkest and lightest values in the<br />

displayed image to obtain the desired contrast<br />

and/or detail. Click anywhere in the control and<br />

drag to the left or right to make adjustments.<br />

Image Underlay<br />

CAUTION<br />

You must have at least Clinical | Field Defs | View and Image |<br />

ViewStation | Images | View Security rights for the image to<br />

appear.<br />

You can enable Image Underlay by checking the Enable Image Underlay check box in<br />

Department Setup. When enabled and the criteria described below are met, the current<br />

reference image for the patient appears beneath the shaped field or, for historical views, the<br />

reference image that was viewable at the time of treatment.<br />

The Display Image option must be enabled from either the Treatment Field Definition dialog<br />

box, or the Beam’s Eye View dialog box. If you disable this option from either dialog box,<br />

the image is hidden. You must also click the Use for Tx Definition check box in the Image<br />

dialog box. This check box is only available after the simulator image or DRR has been<br />

reticle scaled.<br />

134 Copyright 2010, Elekta Impac Software<br />

LUGMSQ0002/4.0/23-Sep-2010

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