2017_IGRT course book

Impact on dose to the rectum and CT/MRI delineation of the prostate

Differences in target results in increased therapeutic ratio. This can be used in two ways:

Prostate dose 78 Gy (5 mm ctv-ptv margin) EUD rectum 68 Gy is reduced to 62 Gy If EUD 68 Gy is acceptable (5 mm margin) Dose prostate 78 Gy is increased to 85 Gy

ESTRO IG and Adaptive Course Parikh Athens 2017