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Table 8 Uncertainty budget for spleen activity ratios (ASPECT: SPECT-based activity, ACalibrator: radionuclide calibrator-based activity, R(α) / R(β) / R(V): uncertainty components introduced by the recovery originating from α, β and V, respectively)

From: A multicentre and multi-national evaluation of the accuracy of quantitative Lu-177 SPECT/CT imaging performed within the MRTDosimetry project

Setup ASPECT/ ACalibrator Uncertainty components (%) Combined uncertainty (%)
Time Counts R(α) R(β) R(V) ACalibrator ICF
S1 0.85 0.03 0.03 0.74 2.22 1.86 2.60 2.74 4.82
S2a 1.05 0.03 0.02 1.73 4.42 3.00 2.83 3.13 7.02
S2b 0.89 0.03 0.04 1.68 4.19 1.50 2.83 3.13 6.36
S2c 0.91 0.03 0.04 0.57 1.71 0.77 2.83 3.13 4.65
S4 0.96 0.03 0.04 2.24 2.22 6.05 0.52 0.52 6.86
S5 1.03 0.03 0.02 2.11 5.56 3.84 4.00 7.07 10.77
S6 0.90 0.03 0.02 0.62 1.84 0.63 4.00 4.00 6.01
S7 0.93 0.03 0.02 0.84 2.60 1.96 4.24 4.24 6.87
S8 0.90 0.08 0.05 0.18 0.76 0.41 2.20 2.20 3.23
S9 0.96 0.08 0.04 0.66 2.02 1.78 2.20 2.20 4.17