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6.5.3
Comparing Reference and Live Images
General
An image saved as reference image can be compared with a live image of a subsequent fraction
Information
using subtractive video.
Subtractive Image
Display
Changes to the patient position are displayed in the video image. A black screen indicates a perfect
match between the live and the reference image.
Position Change
If the patient's position has changed by more than 5 degrees in both directions, the video reference
Too Large
can no longer be used. The subtractive image is no longer displayed, and the live view is shown
instead as shown below. To continue with video verification, a new reference image must be taken
in this position.
Clinical User Guide Rev. 1.1, ExacTrac Infrared Monitoring Ver. 1.0
Figure 30
Figure 31
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