Dose 2016
Probabilistic planning
PTV based planning
CTV based planning
Sample different instances of patient/CTV/beams using known/assumed variations
CT planning study snapshot of CTV
Unknown, mean position of the CTV
PTV formed from the snapshot CTV
Calc./opt. dose Calc./opt. dose Calc./opt. dose
DVH:s
V
Calculate/optimize dose
DVH
D
V
Planning using dose coverage probability* gives better treatment plans!
V
D
D
* e.g. Gordon etal, MedPhys 2010 37 p550-63
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