MOSAIQ User's Guide - UCSF Radiation Oncology

CHAPTER 7: Image Management-ViewStation & Photos and Diagrams
6. If you are associating the image with a treatment field, click the Field radio button, then
click OK.
7. In the Treatment Field Definitions window, click the field you wish to associate with the
image, then click Select.
8. Click OK to close the Image Viewer window to save your changes and close the window.
Reticle Scaling Reference Images
Reticle scaling reference images is the process that defines the magnification (scaling) factors,
beam center, and rotation of a reference image (DRR or Simulation), so that MOSAIQ can
accurately show the treatment geometry on the image. You cannot display images in the
Treatment Field Definition dialog box until the image has been reticle scaled. Before reticle
scaling, you must associate the image with a prescription site or treatment field.
CAUTION
Images exported from electronic sources using DICOM RT Image can
include scaling data that can be used in MOSAIQ. Therefore, you do not
have to reticle scale these images.
To manually reticle scale an image you must have a visible reference
such as a “burned-in” graticule that represents the central axis and
relative scale of the image.
The reference image must have square pixels, must NOT have a
Shadow filter applied, must not have already been used in a
treatment field that has been treated, and must not have an
associated offset.
You must also associate the image with a treatment field,
prescription site, or patient before reticle scaling.
Reticle Scaling a Reference Image
1. Click a reference image that has already been associated a treatment field, then click
Open. There must be a red outline in the viewer of the Image window.
2. Right-click or press F4, then click Reticle Scale Image.
A red reticle tool appears in the center of the image in the Image window.
The major ticks on the reticle tool equal 5 cm, and the magenta
arrow always points toward the gantry stand with respect to the
image.
3. Click until the image is large enough to align the red reticle tool easily with the
reticle on the image. If you zoom in too much, click to decrease the size of the
image.
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LUGMSQ0002/4.0/23-Sep-2010