System | Discovery NM/CT 670 Pro | Precedence 6 | Symbia Intevo 6 | Symbia T16 system 1 | Symbia T16 system 2 | All |
---|---|---|---|---|---|---|
Imaging center | Leiden University Medical Center | Maastricht University Medical Center | Noord West ziekenhuis Groep | Radboud University Medical Center | Erasmus University Medical Center | All |
Reconstruction | OSEM* + Evolution with PSF* correction | OSEM* + Astonish with PSF* correction | Weighted Conjugate Gradient + xSPECT with PSF* correction | OSEM* + Flash 3D with PSF* correction | OSEM* + Hybrid Recon V1.2 with PSF* correction | OSEM* + Hybrid Recon V1.2 with PSF* correction |
Quantification | Q.Metrix | Manual analysis | xSPECT Quant | Manual analysis | Hermes SUV SPECT | Hermes SUV SPECT |
Iterations | 9 [5] | 3 | 24 | 6 | 5 | 5 |
Subsets | 10 | 16 | 2 | 16 | 16 | 16 |
Post-reconstruction filter | None | None | 7.5 mm (Gaussian) | 8.4 mm (Gaussian) | 5 mm (Gaussian) | 5 mm (Gaussian) |
Processing | GE Xeleris 4.0 workstation | Philips Extended Brilliance Workspace | Siemens Syngo.via | Siemens Inveon Research Workplace | Hermes Hybrid Viewer | In-house developed Python algorithm |
Attenuation correction | CT-based, bilinear conversion of HU into attenuation coefficients at 140 keV | CT-based, HU segmentation using a step-like law, bilinear conversion of HU into attenuation coefficients at 140 keV | CT-based, bilinear conversion of HU into attenuation coefficients at 140 keV | CT-based, bilinear conversion of HU into attenuation coefficients at 140 keV | CT-based, Bilinear conversion of HU into attenuation coefficients at 140 keV | CT-based, bilinear conversion of HU into attenuation coefficients at 140 keV |
Scatter Correction | DEW* (120 keV ± 10%) | Kernel based | DEW* (119 keV ± 7.5%) | DEW* (119 keV ± 10%) | Monte Carlo-based | Monte Carlo-based |
Image voxel size | 2.21 × 2.21 × 2.21 mm3†| 4.7 × 4.7 × 4.7 mm3 | 2.54 × 2.54 × 2.54 mm3 | 4.8 × 4.8 × 4.8 mm3 | 4.8 × 4.8 × 4.8 mm3 | 4.8 × 4.8 × 4.8 mm3 |