Brainlab EXACTRAC INFRARED MONITORING Clinical User Manual page 65

Safety Notes
Clinical User Guide Rev. 1.1, ExacTrac Infrared Monitoring Ver. 1.0
Accuracy may be reduced if one or more of the reflective marker spheres on your ref-
erence system are not visible to the infrared camera. This also applies if infrared body
markers are used. Verify that the surface of all marker spheres is dry and in good con-
dition prior to use. Damaged marker spheres should be replaced.
To ensure accurate patient monitoring using the infrared camera, any IR reference de-
vices not required for the procedure must be removed from the camera field of view.
The camera's illuminator filters and lenses should be inspected before use to ensure
that they are not damaged and that they are sufficiently clean.
Do not adjust the camera position during treatment. Always calibrate the system after
an equipment collision occurs. In the case of extreme collisions, contact Brainlab sup-
port.
Never reposition the patient according to the displayed shift or isocenter cross. The
displayed shift information is only intended to support the decision whether a new
IGRT setup procedure is required due to patient motion. Due to skin shift, patient de-
formation or partially hidden Infrared Body Markers, the real isocenter offset will typ-
ically be different from the displayed values. Repositioning of the patient will always
require acquisition of new IGRT data.
Partly hidden Infrared Markers could affect whether a patient movement is shown dur-
ing couch rotation. To identify this, the couch can be rotated back to 0°. If the patient
is now in right position it is not mandatory to verify the patient positioning with the
IGRT system as the shown deviation is based on partly hidden Infrared Body Markers.
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