350 / 1084
•
Gradient Index:
A measure for dose fall-off
Dose homogeneity & Conformity
PIV: Prescription isodose volume, in this case PIV
95
GI
=
PIV
50
PIV
PIV
50
: Volume that receives half of prescription dose
The lower the better
(eg for SRS a GI less than 3 is suggested).
CompetitivePlans 2017 - D. Verellen