Advanced TP

Principle of calculation of Dose Volume Histograms

PTV

Be careful when evaluating D max

and

D min

from DVH statistics

 each ROI contains of a number of dose voxels  the dose is constant within a voxel (center point)  the relative ROI volume in each dose voxel gives the dose value from the center point

Dose voxels

Trade off between calculation time and dose accuracy !