Brain 17 Vienna

Metric

calculation

conformity index (RTOG)

rCI V Rx

/ V PTV

conformity index (Paddick)

pCI V 2 target delivery PTV,Rx

/ V PTV

x V Rx

homogeneity index

HI

D max

/ D Rx

gradient index / V 100% volumes of normal tissue (brain/ROIs) irradiated to Dx 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