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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

Phantom

55–250 keV wide spectrum and TEW

55–229 keV wide spectrum and DEW

Calibration factor (cps/MBq)

Dead-time constant (μs)

Calibration factor (cps/MBq)

Dead-time constant (μs)

Air-2Da

9.36 ± 0.01

0.632 ± 0.003

9.54 ± 0.01

0.534 ± 0.003

Air-3D

9.19 ± 0.05

0.638 ± 0.014

9.39 ± 0.05

0.565 ± 0.018

CTDI-10

9.30 ± 0.07

0.686 ± 0.019

9.48 ± 0.07

0.555 ± 0.021

CTDI-16

9.35 ± 0.08

0.606 ± 0.038

9.54 ± 0.08

0.462 ± 0.041

CTDI-32

9.31 ± 0.06

0.658 ± 0.020

9.44 ± 0.07

0.476 ± 0.026

Jaszczak

9.38 ± 0.05

0.673 ± 0.015

9.70 ± 0.06

0.496 ± 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