Advanced Brachytherapy Physics - Vienna 2016

Type B uncertainty … scoring  CPE can be assumed and only photons need be simulated

Photon-only simulation introduces errors >2% @ distances at or below 1.6, 3, and 7mm for Ir-192, Cs-137, and Co-60 sources, respectively (Perez-Calatayud et al. 2012) but this is source specific and clinically irrelevant in most cases.  Scoring cell dimensions are important! See Taylor et al (2007) for details and . Rivard et al. (2004) and Perez-Calatayud et al. (2012) for recommendations A b t i l or ana ogue ncreas ng voxe s ze w re uce ype u ncrease vo ume averaging  For track length estimators reducing voxel thickness while preserving surface will reduce volume averaging without affecting type A  F l MC i i l i ill d t