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Probabilistic planning
Unknown, mean position of the
CTV
CT planning study snapshot of
CTV
PTV
formed from the snapshot
CTV
PTV based planning
CTV based planning
Sample different instances of patient/CTV/beams using
known/assumed variations
D
V
DVH
Calculate/optimize dose
Calc./opt. dose Calc./opt. dose Calc./opt. dose
D
V
DVH:s
D
V
Planning using dose coverage probability*
gives better treatment plans!
* e.g. Gordon etal, MedPhys 2010 37 p550-63