L0_2016_Athens_Physics_Programme_V6

1118-1119 / 3107

Assumptions/simplifications in derivation of MPTV,i = 2.5Σi+0.7σ i:
- large number of fractions
- spherical tumor
- ideal conformality: 95% isodose is a sperical surface coinciding with the
PTV surface (ICRU-50: 100% of PTV should get dose ≥ 95%)
- only translational set-up errors, i.e. no intra-fraction motion, no tumor
rotations, no deformations (derived margin often has to be considered
as lower limit)