TABLE I.
Protocol information for the Elekta XVI, Varian OBI, and GE LightSpeed system scans used in this study.
| Protocol | Collimator/filter settings | Field of view (cm) | Matrix size | Pixel size (mm) | Slice thickness (mm) | Tube voltage (kVp) | Total mAs | Frames | Scan angle (deg) |
|---|---|---|---|---|---|---|---|---|---|
| Elekta XVI Pelvis M20 | M20/F1 | 42.64 | 410 × 410 | 1.0 | 2.5 | 120 | 1056 | 660 | 360 |
| Elekta XVI Prostate Seed S10 | S10/F0 | 27.68 | 270 × 270 | 1.0 | 2.5 | 120 | 117.1 | 366 | 200 |
| Elekta XVI Chest M20 | M20/F1 | 42.64 | 410 × 410 | 1.0 | 2.5 | 120 | 1056 | 660 | 360 |
| Elekta XVI Head and Neck S20 | S20/F0 | 27.68 | 270 × 270 | 1.0 | 2.5 | 100 | 36.6 | 366 | 200 |
| Varian OBI Pelvis | Half-Fan | 46.0 | 512 × 512 | 0.90 | 2.5 | 125 | 1056 | 660 | 364 |
| Varian OBI Spotlight | Full-Fan | 26.0 | 512 × 512 | 0.51 | 2.5 | 125 | 1320 | 367 | 200 |
| Varian OBI Thorax | Half-Fan | 46.0 | 512 × 512 | 0.90 | 2.5 | 125 | 264 | 660 | 364 |
| Varian OBI Head | Full-Fan | 26.0 | 512 × 512 | 0.51 | 2.5 | 100 | 264 | 367 | 200 |
| GE LightSpeed Pelvis (Helical Mode) | … | 46.0 | 512 × 512 | 0.90 | 2.5 | 120 | 1056 | 660 | … |
| GE LightSpeed Head (Helical Mode) | … | 26.0 | 512 × 512 | 0.51 | 2.5 | 120 | 117.1 | 366 | … |