Fig. 3From: On the use of solid 133Ba sources as surrogate for liquid 131I in SPECT/CT calibration: a European multi-centre evaluationSetup-specific cross-calibration between 133Ba and 131I. The solid line represents the setup-specific cross-calibration line (linear model fit, see Table 4), and the dashed line represents the ratio of the emission probabilities between 133Ba and 131I. Note that the 133Ba pseudo-ICF values represent the combined average between both sourcesBack to article page