Contrast and RMS Results for Images Without Attenuation Correction
| System 1 | System 2 | System 3 | System 4 | System 5 | ||||||
| Protocol | Contrast (%) | RMS (%) | Contrast (%) | RMS (%) | Contrast (%) | RMS (%) | Contrast (%) | RMS (%) | Contrast (%) | RMS (%) |
| Brain (CO) | 51.65 (z = 1.46) | 10.48 (z = 1.46) | 67.41 (z = 1.28) | 19.87 (z = 1.28) | 48.28 (z = 1.45) | 9.28 (z = 1.45) | 52.63 | 16.22 | 32.17 (z = 1.46) | 8.36 (z = 1.45) |
| Brain (NCO) | 49.19 | 5.32 | — | — | 26.63 | 5.16 | 60 | 15.81 | — | — |
| Brain (NCO) (zoom) | 53.26 (z = 1.46) | 11.02 (z = 1.46) | — | — | 41.89 (z = 1.45) | 10.21 (z = 1.45) | — | — | — | — |
| General SPECT (CO) | 46.67 | 10.54 | 32.48 | 4.36 | 56.76 | 11.55 | 57.14 | 14.29 | 39.13 | 9.33 |
| General SPECT (NCO) | 54.35 | 10.43 | — | — | 67.47 | 10.98 | 67.39 | 14.74 | — | — |
CO = circular orbit; NCO = noncircular orbit.