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Patient setup
•
Systematic uncertainty related to IGRT workflow, in this particular
case the CBCT – CT registration and automated set-up.
•
The registration uncertainty was already accounted for.
•
The positioning uncertainty after automated couch movement can
be assessed by the weekly QA (alternative: an extra CBCT)
in this case the so-called PentaCheck: data from January 2016-May 2016.
Laser setup
CBCT
Couch correction
EPID verification
Average uncertainty antero-posterior: -1.08mm (SD: 0.80mm)
The PTV 2017 - D. Verellen