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