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PTV in practice?
•
… Use
coverage probabilities
to derive margins ...
•
... This idea is limited to effects expressed in terms of physical
dose, biological response parameters are not included ...
Stroom
et al.
:
99% of target volume receives 95% of the prescribed
dose or more
Van Herk
et al.
:
90% of patients in the population receives a
minimum cumulative CTV dose of at least 95 % of the prescribed
dose
.
•
… Not all patients will be treated to 100% of the prescription
dose in all fractions!!!
The PTV 2017 - D. Verellen