Fig. 12From: Comprehensive SPECT/CT system characterization and calibration for 177Lu quantitative SPECT (QSPECT) with dead-time correctionDead-time-corrected SPECT sensitivity (observed primary photons count rate per activity) as a function of observed wide-spectrum count rate when activity segmentation was applied to the reconstructed SPECT images by drawing circular regions of interest around source regions (a), or by thresholding at one percent of maximum voxel (b). Planar data (Air-2D, averaged for both detectors) is shown for comparisonBack to article page