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Table 5 Camera calibration factor and dead-time constant (± SE) derived from segmented SPECT images

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

Phantom18–680 keV wide spectrum & TEW
Region-of-interest segmentationThreshold segmentation
Calibration factor (cps/MBq)Dead-time constant (μs)Calibration factor (cps/MBq)Dead-time constant (μs)
Air-3D9.51 ± 0.060.570 ± 0.0149.25 ± 0.050.577 ± 0.012
CTDI-109.58 ± 0.040.535 ± 0.0109.30 ± 0.070.578 ± 0.016
CTDI-169.68 ± 0.060.522 ± 0.0239.36 ± 0.080.512 ± 0.032
CTDI-329.69 ± 0.040.538 ± 0.0099.25 ± 0.050.516 ± 0.016
Jaszczak9.39 ± 0.040.568 ± 0.0119.38 ± 0.050.565 ± 0.013
  1. Method B (full-range CF), with wide-spectrum (18–680 keV) acquisition count rate, was used to derive the calibration factor and the dead-time constant. TEW: Triple-energy window scatter correction