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