494-495 / 2437
Metric
calculation
worse ideal
value
conformity index (RTOG)
rCI V
Rx
/ V
PTV
low 1.0
conformity index (Paddick)
pCI V
2
PTV,Rx
/ V
PTV
x
V
Rx
low 1.0
homogeneity index
HI
D
max
/ D
Rx
high 1.0
gradient index
GI V
50%
/ V
100%
high 1.0
Metrics for high precision RT
V
Rx
- volume covered by prescription isodose
V
PTV
- PTV volume
V
PTV,Rx
- overlapping volume
D
max
- maximum dose in the PTV
D
Rx
- prescription dose in the PTV