Brain 17 Vienna
Metric
calculation
conformity index (RTOG)
rCI V Rx
/ V PTV
conformity index (Paddick)
pCI V 2
/ V PTV
x V Rx
PTV,Rx
homogeneity index
HI
D max
/ D Rx
gradient index / V 100% normal tissue volume (brain/ROIs) irradiated to Dx (DVH) planning time, treatment time etc. GI V 50%
V Rx V PTV D max D Rx V PTV,Rx
- volume covered by prescription isodose
- PTV volume
- overlapping volume
Metrics for high precision RT
- maximum dose at the PTV - prescription dose in the PTV
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