TABLE 1.
Scanning Protocol Characteristics
| Characteristic (PET emission images) | Discovery STE (both) | Gemini TF 64 | Biograph 20 mCT | Biograph 6 |
| N | 17 3D, 18 2D | 6 | 2 | 3 |
| Slice thickness (mm) | 3.27 | 4 | 5 | 5 |
| Pixel size (mm) | 5.47 | 4 | 4.07 | 4.06 |
| Pixel volume (cm3) | 0.098 | 0.064 | 0.083 | 0.083 |
| Reconstruction diameter (mm) | 700 | 576 | 815 | 683 |
| Array size (pixels) | 128 × 128 | 144 × 144 | 200 × 200 | 168 × 168 |
| Bed-position duration (min) | 5, 7 | 4 | 2, 3.5 | 3 |
| Average coverage (total cm/total min) | 2.1, 2.4 | 2.3 | 2.8, 4.9 | 4.0, 4.1 |
| Reconstruction method | OSEM 3D/2D | BLOB-OS-TOF | PSF+TOF 2i21s | PSF, 3i24s |
| Scatter correction method | Model-based | SS-SIMUL | Model-based | Model-based |
3D = 3-dimensional; 2D = 2-dimensional; OSEM = ordered-subset expectation maximization; TOF = time-of-flight; PSF = point-spread function; 2i21s = 2 iterations, 21 subsets; 3i24s = 3 iterations, 24 subsets; SS-SIMUL = single-scatter simulation.
All scans were in inferior-to-superior direction.