Dose Course 2018_Flipping book

Dose uncertainties in MC MV photon dose calculations

❑ Bazalova PMB 2008, Dual-energy CT-based material extraction for tissue segmentation in Monte Carlo dose calculations 250 kV x-rays 18 MV x-rays

Single energy CT segmentation

real

segmented

segmented

real

3% errors

17% errors

From F Verhaegen

But <1% when dual energy used