Cross-Comparison Between Systems for Images Without Attenuation Correction
| Systems 1 and 2 software | System 3 software | System 4 software | System 5 software | |||||
| SPECT system | Contrast (%) | RMS (%) | Contrast (%) | RMS (%) | Contrast (%) | RMS (%) | Contrast (%) | RMS (%) |
| System 1 | 53.93 | 3.4 | 64.73 | 3.31 | 54.92 | 3.5 | 52 | 3.2 |
| System 2 | 67.24 | 3.01 | 72.95 | 3.04 | 61.25 | 3.21 | 60.17 | 2.92 |
| System 3 | 69.26 | 3.02 | 83.9 | 2.94 | 65.41 | 3.09 | 95.2 | 3.86 |
| System 4 | 58.2 | 4.01 | 62.96 | 3.85 | 58.62 | 4.15 | 65.33 | 3.85 |
| System 5 | 34.27 | 3.35 | 41.64 | 3.24 | 34.25 | 3.2 | 34.85 | 3.02 |