TABLE 3.
As overview of the imaging performance of the IRm, the weighted cone‐beam dose index (CBDIw), contrast‐noise‐ratio (CNR) (for the LDPE, polystyrene, and Delrin® insert), non‐uniformities (determined from the lateral/anterior–posterior (AP) CTP486 computed tomography (CT)‐number profiles), image noise (from integrating the noise power spectrum (NPS)) converted to a CBDIw of 1 mGy, as well as the imaging fidelity, that were altogether measured for each investigated scan protocol, are listed
| CNR | Non‐uniformity (HU) | |||||||
|---|---|---|---|---|---|---|---|---|
| Protocol | CBDIw (mGy) | LDPE | Polystyrene | Delrin® | Lateral | AP | Noise (HU) at 1 mGy | Imaging fidelity (mm) |
| Pelvis | ||||||||
| ‐ Low dose (PL) | 9.7 ± 0.3 | 10.4 ± 0.2 | 8.4 ± 0.3 | 14.8 ± 0.5 | ‐6 ± 11 | ‐6 ± 14 | 43.6 ± 0.6 | 0.18 ± 0.11 |
| ‐ Standard (PS) | 13.6 ± 0.2 | 15.4 ± 0.2 | 10.2 ± 0.3 | 21.2 ± 0.8 | 2 ± 11 | ‐34 ± 10 | 39.9 ± 0.7 | 0.21 ± 0.18 |
| ‐ Obese (PO) | 16.8 ± 0.2 | 17.0 ± 0.4 | 10.3 ± 0.3 | 20.8 ± 0.7 | ‐20 ± 10 | ‐35 ± 7 | 41.3 ± 0.8 | 0.19 ± 0.16 |
| ‐ High‐quality (PH) | 16.8 ± 0.2 | 21.5 ± 1.6 | 14.7 ± 1.7 | 28.1 ± 2.9 | ‐2 ± 15 | ‐3 ± 23 | 35.2 ± 1.3 | 0.39 ± 0.53 |
| Breast | ||||||||
| ‐ Standard (BS) | 5.0 ± 0.2 | 7.5 ± 0.5 | 5.6 ± 0.2 | 10.5 ± 0.5 | ‐2 ± 12 | ‐2 ± 17 | 43.8 ± 0.9 | 0.19 ± 0.23 |
| ‐ Obese (BO) | 7.8 ± 0.3 | 10.4 ± 0.3 | 7.2 ± 0.3 | 14.1 ± 0.5 | 9 ± 10 | 12 ± 11 | 39.7 ± 0.9 | 0.17 ± 0.12 |
| ‐ High‐quality (BH) | 8.7 ± 0.2 | 10.9 ± 0.2 | 8.3 ± 0.2 | 14.8 ± 0.4 | 1 ± 10 | 3 ± 18 | 39.7 ± 1.4 | 0.20 ± 0.15 |
| Abdomen | ||||||||
| ‐ Low dose (AL) | 2.0 ± 0.2 | 1.79 ± 0.04 | 1.41 ± 0.04 | 2.39 ± 0.05 | 120 ± 60 | 136 ± 19 | 115.8 ± 0.9 | 0.18 ± 0.14 |
| ‐ Standard (AS) | 11.9 ± 0.4 | 4.23 ± 0.09 | 3.22 ± 0.06 | 5.67 ± 0.10 | 144 ± 16 | 131 ± 6 | 113.6 ± 0.2 | 0.18 ± 0.14 |
| ‐ Obese (AO) | 40.6 ± 0.5 | 8.59 ± 0.09 | 6.25 ± 0.06 | 11.44 ± 0.15 | ‐45 ± 10 | ‐40 ± 5 | 122.9 ± 1.3 | 0.19 ± 0.18 |
Abbreviations: AP, anterior–posterior; HU, Hounsfield Unit.