MOSAIQ User's Guide - UCSF Radiation Oncology

CHAPTER 7: Image Management-ViewStation & Photos and Diagrams
6. Click to open the Reticle Scaling dialog box, shown in Figure 28.
Figure 28: Reticle Scaling Dialog Box
7. Click Auto Detect to automatically detect the beam isocenter and calculate distances.
The Reticle Scaling dialog box lets you correct film rotation. When
you align the graticule and the beam isocenter, the reticle angle
should be the same as the collimator angle of the image. When
these values do not match, which is often caused by film/cassette
rotation, you can type the actual collimator angle to correct the film
rotation.
8. After you reticle scale the verification image, you can click to zoom all images
together. Move your mouse to the left to decrease the magnification and to the right to
increase the magnification.
9. Click your mouse again to return to the regular view.
10. You can also click to show only one image.
Field Edge Image Center and Scaling (for Images without Graticules)
Field edge image center and scaling lets you automatically or manually attach isocenter and
scale information to a single exposure verification image that does not have a “burned in”
graticule.
1. In the Image Work List dialog box, click the image pair, and click Review.
2. Click the Patient Offset tab in the Image Review window, and click Register.
3. Click the verification image to activate it, then click to open the Reticle Scaling
dialog box.
4. Click the Field Edge radio button to show treatment field edges on the verification (teal)
and reference (red) images. The isocenter and any field aperture imported annotation
curves show on the reference image. The Field Edge radio button is unavailable when
you apply the AHE filter.
5. If the field edge automatically extracted from the verification image is unacceptable, click
the Extract Field Edge check box to manually adjust the extraction threshold, then
move the threshold bar in the Field Edge Threshold group to extract a new field edge
from the treatment image.
The treatment field edge changes automatically when you change the threshold.
Copyright 2010, Elekta Impac Software 157
LUGMSQ0002/4.0/23-Sep-2010