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Table 6 Camera calibration factor and dead-time constant (± SE) derived from planar and threshold-segmented SPECT data with reduced wide-spectrum window width

From: Comprehensive SPECT/CT system characterization and calibration for 177Lu quantitative SPECT (QSPECT) with dead-time correction

Phantom55–250 keV wide spectrum and TEW55–229 keV wide spectrum and DEW
Calibration factor (cps/MBq)Dead-time constant (μs)Calibration factor (cps/MBq)Dead-time constant (μs)
Air-2Da9.36 ± 0.010.632 ± 0.0039.54 ± 0.010.534 ± 0.003
Air-3D9.19 ± 0.050.638 ± 0.0149.39 ± 0.050.565 ± 0.018
CTDI-109.30 ± 0.070.686 ± 0.0199.48 ± 0.070.555 ± 0.021
CTDI-169.35 ± 0.080.606 ± 0.0389.54 ± 0.080.462 ± 0.041
CTDI-329.31 ± 0.060.658 ± 0.0209.44 ± 0.070.476 ± 0.026
Jaszczak9.38 ± 0.050.673 ± 0.0159.70 ± 0.060.496 ± 0.029
  1. TEW: triple-energy window scatter correction. DEW: dual-energy windows scatter correction. Method B (full-range CF), with wide-spectrum acquisition count rate, was used to derive the calibration factor and the dead-time constant. aPlanar images of Air-2D phantom were not segmented, and data from both detectors was averaged