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