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Patient setup
•
In-house study on 10 patients, followed for 10 fractions each.
•
Patient set-up on laser and skin marks, daily CBCT and
appropriate correction pre-treatment, daily post-treatment CBCT.
Interfraction systematic and random uncertainty based on laser setup
(i.e. difference between laser setup and CBCT)
Pat 1
Pat 2
… Pat 10
Fraction 1
Fraction 2
…
The PTV 2017 - D. Verellen
Fraction 25
Average
SD
SD (averages) = Σ
interfr
= 19.13 mm
average (SD) = σ
interfr
= 4.52 mm