SPECT Image Noise, Image Contrast, and Subjective Image Quality Score
| Quality index | FBP SPECT | ASiR SPECT | P (noninferiority) |
| Likert no. 1 | 3.5 ± 0.6 | 3.5 ± 0.6 | <0.0001 |
| Likert no. 2 | 3.6 ± 0.5 | 3.6 ± 0.5 | <0.0001 |
| CR | 13.41 ± 7.83 | 13.45 ± 7.99 | <0.0001 |
| SNR | 2.33 ± 0.83 | 2.32 ± 0.84 | <0.0001 |
Likert = 5-point scale image quality score.
Data are mean ± SD.