RTD instability and SRS cube calibration
Posted: Fri Jul 12, 2024 11:39 am
Hi,
We use 2 linacs for intracranial SRS. Both have AlignRT and 6-DoF couch (Hexapod). On one of these linacs we have the VisionRT SRS cube calibration but not on the other. Testing AlignRT with a phantom and couch rotations we have found:
Both linacs show the same sensitivity and accuracy to small deviations.
Both linacs start to show unstable RTDs for couch rotation greater than 45degrees.
Both linacs lose monitoring completely at large couch rotations (>70degrees)
Thr ROI was drawn covering the anterior and both sides of the mask
Is there something we are missing in terms of the use of AlignRT for SRS with couch rotations?
Could someone explain the benefit (if any) of using the SRS cube calibration?
We use 2 linacs for intracranial SRS. Both have AlignRT and 6-DoF couch (Hexapod). On one of these linacs we have the VisionRT SRS cube calibration but not on the other. Testing AlignRT with a phantom and couch rotations we have found:
Both linacs show the same sensitivity and accuracy to small deviations.
Both linacs start to show unstable RTDs for couch rotation greater than 45degrees.
Both linacs lose monitoring completely at large couch rotations (>70degrees)
Thr ROI was drawn covering the anterior and both sides of the mask
Is there something we are missing in terms of the use of AlignRT for SRS with couch rotations?
Could someone explain the benefit (if any) of using the SRS cube calibration?