Brain 17 Vienna

Metric

worse ideal value low 1.0

calculation

conformity index (RTOG)

rCI V Rx

/ V PTV

conformity index (Paddick)

pCI V 2

/ V PTV

x V Rx

low 1.0

PTV,Rx

homogeneity index

HI

D max

/ D Rx

high 1.0

gradient index

GI V 50%

/ V 100%

high 1.0

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 in the PTV - prescription dose in the PTV