From: Towards standardization of absolute SPECT/CT quantification: a multi-center and multi-vendor phantom study
Sphere
diameter
RCmean
RCmax
Vendor-specific
Vendor-neutral
37 mm
0.01
0.05
0.03
28 mm
0.10
0.02
0.16
0.04
22 mm
0.20
0.28
0.06
17 mm
0.11
0.18
13 mm
0.09
0.13