357 / 1228
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
F l
MC i
i
l i
ill d t
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