Research Masterclass in Radiotherapy Physics 2017
Probabilistic / robust planning to replace PTV/PRV concepts
conventional planning
probabilistic planning
CTV
OAR
CTV
OAR
95% PTV P(98% of CTV gets dose > 95%) = 98%
P(98% of CTV gets dose > 95%) = 98%
Probabilistic / robust planning to replace PTV/PRV concepts • Directly optimize CTV/OAR dose • HOW: - cost functions include knowledge on motion OR - simultaneously optimize multiple scenario’s • If prostate moves anteriorly, then also the proximal part of the rectum • Automatically generate high dose area around CTV • Challenges: (individualized) motion pattern,
anatomy deformation, calculation speed • Highly relevant for IMPT (Bragg peak)
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