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Table 1 CFs for 123I with the LEHR and ME collimator and 131I with the HE collimator, in cps/MBq, for the four CF

From: Evaluation of Iodine-123 and Iodine-131 SPECT activity quantification: a Monte Carlo study

VOI diameter 123I LEHR (cps/MBq) 123I ME (cps/MBq) 131I HE (cps/MBq)
1 CFcylinder 89.3 119.0 27.7
2 CFcylinder 88.4 115.6 26.8
  CFwater 84.4 118.2 27.6
  CFair 82.4 116.4 27.2
  CFpoint 84.1 115.5 27.8
  Average ± SD 84.8 ± 2.5 116.4 ± 1.3 27.4 ± 0.4
  Relative SD (%) 2.9 1.1 1.5
3 CFcylinder 100.4 118.9 28.6
  CFwater 102.2 120.2 29.1
  CFair 98.4 117.7 29.4
  CFpoint 102.4 118.7 31.7
  Average ± SD 100.9 ± 1.9 118.9 ± 1.0 29.7 ± 1.4
  Relative SD (%) 1.9 0.8 4.7
  1. VOI diameters were defined as (1) less than the physical source diameter, (2) equal to the physical source diameter plus a 3-cm margin and (3) equal to the physical size of the detector