Fig. 5
From: Quantitative SPECT (QSPECT) at high count rates with contemporary SPECT/CT systems
SPECT quantification accuracy for the whole NEMA phantom and the small saline bag (CT-based VOIs expanded by 1 cm for both) vs. activity (a and b) and observed averaged wide-spectrum count rate (c and d), for System A1 and A2 (Symbia T6 with only detector 1 and both detectors activated, respectively) and System B (Discovery 670 with both detectors activated), without (a and c) and with (b and d) dead-time correction using the paralyzable model