Brainlab EXACTRAC INFRARED MONITORING Clinical User Manual page 101

Ambiguities due to • Reduced numbers of markers applied.
Hidden/Invisible
• One marker is damaged or reflects insufficiently.
Markers
• The patient's body covers a second marker.
• A marker is covered by another marker.
• The linac gantry is blocking markers from the camera's field of view, e.g. prostate patients with
Clinical User Guide Rev. 1.1, ExacTrac Infrared Monitoring Ver. 1.0
markers applied to the thorax.
No. Description
a
Markers hidden by the patient's body
s
One marker hidden by another marker
Handle the markers carefully and exchange damaged or poorly visible markers.
a
Figure 43
s
Figure 44
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