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EJNMMI Physics

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
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