Quantitative Parameters Derived from Simulated Images
| Value at the following window center ± width (keV): | |||||
|---|---|---|---|---|---|
| Parameter | 68 ± 10% | 73 ± 15% | 75 ± 15% | 77 ± 15% | Reference |
| Relative sensitivity | 1 | 1.18 | 1.08 | 0.97 | |
| PTSR | 0.59 | 0.88 | 1.04 | 1.21 | |
| Myocardium-to-cavity contrast | 0.52 | 0.57 | 0.62 | 0.62 | 0.91 |
| Myocardium-to-defect contrast | 0.19 | 0.19 | 0.19 | 0.23 | 0.35 |
Images were acquired with SimSET SPECT simulator in 4 energy window configurations. Reference values were directly derived from NCAT activity distribution images. Difference between conventional window setting and window setting of 77 ± 15% keV was highly significant (P < 0.01), except for relative sensitivity.