Table 2.
Diagnostic performance. The sensitivity for stone detection was calculated on a patient level, and stones, papillary calcifications and parenchymal calcifications were combined. Two patients did not have any stones. The sensitivity is presented as median (interquartile). For the assessment of extra-urinary tract pathology the number [percentage] of non-assessable reconstructions is displayed per observer
| Sensitivity | Cholecys-tectomy | Gall bladder stones | Gall bladder wall thickening | Sigmoid diverticulitis | Appendix visible | Appendicitis | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Routine dose | Obs. 1 | Obs. 2 | Obs. 1 | Obs. 2 | Obs. 1 | Obs. 2 | Obs. 1 | Obs. 2 | Obs. 1 | Obs. 2 | Obs. 1 | Obs. 2 | |
| FBP | 94.4 (80.0–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 8 [42] | 0 [0] | 0 [0] | 0 [0] | 1 [5] | 0 [0] | 2 [11] |
| HIR | 100.0 (80.0–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 2 [11] | 2 [11] | 0 [0] | 0 [0] | 0 [0] | 1 [5] | 0 [0] | 1 [5] |
| MIR (BR) | 100.0 (92.9–100.0) | 0 [0] | 0 [0] | 0 [0] | 1 [5] | 0 [0] | 3 [16] | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 1 [5] |
| MIR (ST) | 100.0 (77.8–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 2 [11] | 0 [0] | 0 [0] | 2 [11] | 1 [5] | 1 [5] | 2 [11] |
| 40% reduced dose | |||||||||||||
| FBP | 88.9 (50.0–100.0) | 0 [0] | 0 [0] | 1 [5] | 2 [11] | 4 [21] | 16 [84] | 0 [0] | 0 [0] | 0 [0] | 2 [11] | 0 [0] | 3 [16] |
| HIR | 100.0 (80.0–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 4 [21] | 8 [42] | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 2 [11] |
| MIR (BR) | 100.0 (92.9–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 4 [21] | 0 [0] | 0 [0] | 0 [0] | 1 [5] | 0 [0] | 2 [11] |
| MIR (ST) | 100.0 (92.9–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 5 [26] | 0 [0] | 0 [0] | 1 [5] | 0 [0] | 2 [5] | 2 [11] |
| 60% reduced dose | |||||||||||||
| FBP | 87.5 (50.0–100.0) | 0 [0] | 0 [0] | 2 [11] | 5 [26] | 7 [37] | 19 [100] | 0 [0] | 0 [0] | 2 [11] | 4 [21] | 4 [21] | 5 [26] |
| HIR | 88.9 (75.0–100.0) | 0 [0] | 0 [0] | 1 [5] | 2 [11] | 5 [26] | 13 [68] | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 0 [0] | 5 [26] |
| MIR (BR) | 100.0 (81.3–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 2 [11] | 8 [42] | 0 [0] | 0 [0] | 0 [0] | 1 [5] | 0 [0] | 1 [5] |
| MIR (ST) | 100.0 (80.0–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 3 [16] | 4 [21] | 1 [5] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 1 [5] |
| 80% reduced dose | |||||||||||||
| FBP | 50.0 (16.7–100.0) | 1 [5] | 3 [15] | 14 [74] | 14 [74] | 18 [95] | 10 [100] | 17 [90] | 8 [42] | 16 [84] | 16 [84] | 18 [95] | 16 [84] |
| HIR | 72.2 (62.5–100.0) | 0 [0] | 0 [0] | 4 [21] | 6 [32] | 11 [58] | 18 [95] | 1 [5] | 0 [0] | 6 [32] | 3 [16] | 4 [21] | 6 [32] |
| MIR (BR) | 100.0 (68.8–100.0) | 0 [0] | 0 [0] | 2 [11] | 3 [16] | 4 [21] | 9 [47] | 1 [5] | 0 [0] | 1 [5] | 1 [5] | 1 [5] | 4 [21] |
| MIR (ST) | 78.6 (50.0–100.0) | 0 [0] | 0 [0] | 1 [5] | 1 [5] | 4 [21] | 11 [58] | 0 [0] | 0 [0] | 0 [0] | 2 [11] | 2 [11] | 2 [11] |
FBP filtered back projection, HIR hybrid iterative reconstruction, MIR model-based iterative reconstruction, BR body routine, ST soft tissue, Obs observer