Fig. 2From: Tumor dosimetry using 177Lu: influence of background activity, measurement method and reconstruction algorithmSketch of imaged 177Lu distribution from 177Lu within a sphere or tumor (solid line) with actual, but unknown, mean concentration C, volume V and diameter d. The threshold-based VOI (dashed line) has mean concentration CVOI, volume VVOI and corresponding effective diameter deff, i.e., the diameter of a sphere with volume VVOIBack to article page