Table 2 Summary of acquisition and processing parameters used. See text for full details
From: Inter-comparison of quantitative imaging of lutetium-177 (177Lu) in European hospitals
Site | |||||||
|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | |
Camera | Siemens Symbia T2 | Siemens Symbia T2 | GE Infinia Hawkeye 4 | Siemens Intevo | Ge Optima 640 | Siemens Symbia T6 | GE Discovery 670 |
Collimator | ME | ME | MEGP | ME | MEGP | MELP | MEGP |
Crystal thickness | 5/8″ | 3/8″ | 3/8″ | 3/8″ | 3/8″ | 3/8″ | 5/8″ |
Photopeak(s), keV | – | 113 ± 7.5% | 113 ± 10% | 113 ± 10% | – | – | – |
208 ± 10% | 208 ± 10% | 208 ± 10% | 208 ± 10% | 208 ± 10% | 208 ± 10% | 208 ± 10% | |
Scatter window(s), keV | – | – | – | 98.7 ± 5% | – | – | – |
– | – | – | 131 ± 5% | – | – | – | |
176.8 ± 5% | – | – | 178 ± 5% | 178 ± 5% | – | – | |
239.2 ± 5% | – | – | 214 ± 5% | 214 ± 5% | – | – | |
Orbit type | Contoured | Circular | Contoured | Contoured | Contoured | Circular | Contoured |
Matrix | 128 × 128 | 128 × 128 | 128 × 128 | 128 × 128 | 128 × 128 | 128 × 128 | 128 × 128 |
Number of projections | 120 | 120 | 120 | 120 | 120 | 120 | 120 |
Time per projection | 30 s | 30 s | 30 s | 30 s | 30 s | 30 s | 60 s * |
Reconstruction type | OSEM | OSEM | OSEM | OSEM | OSEM | OSEM | OSEM |
Iterations/subsets | 6/6 | 8/4 | 16/5 | 24/24 | 5/10 | 5/15 | 8/10 |
Attenuation correction | CT | CT | CT | CT | CT | CT | CT |
Scatter correction | TEW | No | Monte Carlo | TEW | TEW | Monte Carlo | ESSE |
Resolution recovery | Yes | No | Yes | Yes | No | Yes | Yes |
Segmentation method | CT VOI + 10 mm | SPECT threshold | CT VOI | CT VOI | CT VOI | CT VOI | CT VOI plus SPECT auto-threshold |