ATP Barcelona 2017

How DVH cost functions are calculated

Dose ( Gy ) in voxel i . . .

PTV: MinDVH d=75Gy vol=99% 1. Sort voxels by dose 2. MinDVH: select highest 99% of voxels 3. Compute and add costs

Cost . . .

0 0 0 0 0 1 1 4

77 77 76 75 75 74 74 73 73 72 X X

99 %

Sum

1 %

20