Course book Advanced Treatment Planning 2018

Q4: what do you do with critical normal tissues (NT)

overlapping with a high-dose PTV, e.g. in SBRT?

A. We prioritize for the PTV,

no respect to NT

B. We prioritize for the NT, no

respect to PTV

C. We lower the dose (or

change fractionation) to the

whole PTV to reach the

constraint of the NT

D. We somehow compromise

in the part of the PTV which

is near the NT

33 · 1. Oktober 2018