Fig. 4
From: Accuracy of 177Lu activity quantification in SPECT imaging: a phantom study
Quantification errors (with uncertainties) for phantom inserts with different shapes and volumes scanned in warm water and segmented with three different methods: 40% fixed threshold (a), CT based (b), and IADT (c). The error distribution for both scatter correction methods, TEW and APDI (d). The horizontal lines in (a–c) mark the maximum and minimum deviations from the truth. The boxes in (d) represent the range of variation (interquartile range-IQR) of the distributions