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Dose normalization
Prescription dose (D
pr
) to %volume of PTV
95% of PTV should be covered by D
pr
99% of PTV should receive ≥ 90% of D
pr
Common prescription levels: 65-85% isodoseline
High dose constraints
Dose > 105% of D
pr
must be inside PTV
D
max
< 125-140% of D
pr
Dose calculation:
type B algorithm is advised
(especially lung)
15
Planning aims
Features of SABR