Table 1.
Optimized parameters chosen according to the model of the scanner
| GE models | Number | Installation year | Slice thickness (mm) | Recons. method | Number of iterations (iterations × subsets) | Post-reconstruction filter type and FWHM if relevant (mm) | Matrix | Pixel spacing (mm × mm) | Others |
|---|---|---|---|---|---|---|---|---|---|
| Discovery 690 | 3 | 2009/2010/2011 | 3.27 | VPHD | 10 × 36 | Gaussian 3.5 | 256 × 256 | 1.17 × 1.17 | Z-filter: standard |
| Discovery RX | 2 | 2009 | 3.27 | FORE + OSEM 2D | 7 × 35 | Gaussian 3.5 | 128 × 128 | 2.34 × 2.34 | Loop filter: 2.34 mm Z-filter: standard |
| Discovery DST - E | 1 | 2004 | 3.27 | FORE + OSEM 2D | 5 × 35 | Gaussian 2.57 | 128 × 128 | 2.34 × 2.34 | Loop filter: 2.34 mm Z-filter: standard |
| Discovery ST 4 | 1 | 2004 | 3.27 | FORE + OSEM 2D | 7 × 35 | Gaussian 3 | 256 × 256 | 1.17 × 1.17 | Loop filter: 2 mm Z-filter: standard |
| Discovery ST | 2 | 2003/2004 | 3.27 | FORE + OSEM 2D | 7 × 32 | Gaussian 2 or 2.57 | 128 × 128 | 2.34 × 2.34 | Loop filter: 2.34 mm |
| Philips models | Number | Installation year | Slice thickness (mm) | Recons. method | Number of iterations (iterations × subsets) | Smoothing (mm) | Matrix | Pixel spacing (mm × mm) | Others |
| Gemini TF | 2 | 2008/2010 | 2 | LOR - RAMLA | 10 × 33 | Smooth B | 128 × 128 | 2 × 2 | – |
| Gemini GXL | 1 | 2006 | 2 | LOR - RAMLA | 10 × NA | Smooth | 128 × 128 | 2 × 2 | – |
| Siemens models | Number | Installation year | Slice thickness (mm) | Recons. method | Number of iterations (iterations × subsets) | Post-reconstruction filter type and FWHM if relevant (mm) | Matrix | Pixel spacing (mm × mm) | Others |
| Biograph mCT 40/64 | 3 | 2009/2012 | 2.027 | OSEM 3D | 12 × 24 | Gaussian 3 or 4 | 256 × 256 | 1.59 × 1.59 | – |
| Biograph Hirez TruePoint | 1 | 2008 | 3 | OSEM 3D | 8 × 21 | Gaussian 4 | 336 × 336 | 1.02 × 1.02 | – |
| Biograph 6 VB 20B True V | 1 | 2006 | 2 | FORE + OSEM 2D | 8 × 21 | Gaussian 4 | 256 × 256 | 1.34 × 1.34 | – |
| Biograph 6 | 2 | 2004/2005 | 2 | FORE + OSEM 2D | 8 × 24 | Gaussian 2 or 3 | 256 × 256 | 1.33 × 1.33 | – |
| Biograph 16 VB40B | 1 | 2004 | 2 | FORE + OSEM 2D | 8 × 24 | Gaussian 3 | 336 × 336 | 1.02 × 1.02 | – |
| Biograph LSO DUO | 2 | 2003/2004 | 3.375 | FORE + OSEM 2D | 8 × 16 | Gaussian 2 | 256 × 256 | 1.33 × 1.33 | – |
NA non applicable, OSEM Ordered Subset Expectation Maximization, VPHD VUE Point High Definition, LOR-RAMLA Line-of-Response Row-Action Maximum Likelihood Algorithm, FORE Fourier Rebinning