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Table 4 Fitted parameters (offset and slope) of the setup-specific cross-calibration line for each individual setup, with their corresponding standard uncertainties determined from the linear fit. The theoretical ratio of gamma-ray emission probabilities of 133Ba and 131I is 0.764 ± 0.005

From: On the use of solid 133Ba sources as surrogate for liquid 131I in SPECT/CT calibration: a European multi-centre evaluation

Cross-calibration linear model parameters

Setup

Offset

Slope

S1

2.80 ± 0.43

0.716 ± 0.014

S2a

7.8 ± 1.8

0.607 ± 0.014

S2b

4.30 ± 0.93

0.752 ± 0.018

S2c

2.88 ± 0.30

0.766 ± 0.011

S2d

1.00 ± 0.50

0.573 ± 0.014

S3

1.84 ± 0.90

0.725 ± 0.030

S4

6.8 ± 3.5

0.701 ± 0.030

S5

2.0 ± 2.2

0.701 ± 0.018

S7

0.57 ± 0.85

0.644 ± 0.022

S8

1.7 ± 1.3

0.553 ± 0.021