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EJNMMI Physics

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

Phantom

18–680 keV wide spectrum & TEW

Region-of-interest segmentation

Threshold segmentation

Calibration factor (cps/MBq)

Dead-time constant (μs)

Calibration factor (cps/MBq)

Dead-time constant (μs)

Air-3D

9.51 ± 0.06

0.570 ± 0.014

9.25 ± 0.05

0.577 ± 0.012

CTDI-10

9.58 ± 0.04

0.535 ± 0.010

9.30 ± 0.07

0.578 ± 0.016

CTDI-16

9.68 ± 0.06

0.522 ± 0.023

9.36 ± 0.08

0.512 ± 0.032

CTDI-32

9.69 ± 0.04

0.538 ± 0.009

9.25 ± 0.05

0.516 ± 0.016

Jaszczak

9.39 ± 0.04

0.568 ± 0.011

9.38 ± 0.05

0.565 ± 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
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