Table 1 Scan parameters of the standard (original) cohort and the proof-of-concept cohort
Protocol | Hip | Knee | Ankle | |||
|---|---|---|---|---|---|---|
Standard | Proof of concept | Standard | Proof of concept | Standard | Proof of concept | |
Automated tube current modulation + automated tube voltage selection | On | On | Off | Off | Off | Off |
Tube voltage (kV) | 100 (selected by software) | 100 (selected by software) | 80 | 80 | 80 | 80 |
Tube current–time product (mAs) | 50(*)/70 (ref. mAs(**)) | 15(*)/21 (ref. mAs(**)) | 35 | 10 | 25 | 8 |
Tube filter | Wedge2(*)/flat | Wedge2(*)/flat | Wedge2(*)/flat | Wedge2(*)/flat | Wedge2(*)/flat | Wedge2(*)/flat |
Pitch | 0.8 | 0.8 | 0.8 | 1.0 | 0.8 | 1.25 |
Rotation time (s) | 0.5 | 0.5 | 1 | 0.5 | 1 | 0.5 |
Total collimation (mm) | 38.4 (0.6 * 64) | 38.4 (0.6 * 64) | 38.4 (0.6 * 64) | 38.4 (0.6 * 64) | 38.4 (0.6 * 64) | 38.4 (0.6 * 64) |
CTDI vol [mGy] (SSDE/Child phantom) | 1.9 ± 0.6(*)/3.3 ± 0.6 (mean SSDE) | 0.8 ± 0.1(*)/1.4 ± 0.3 (mean SSDE) | 1.14(*)/1.48 | 0.32(*)/0.42 | 0.82(*)/1.06 | 0.24(*)/0.34 |
CTDI vol reduction (%) | 55(*)–58% | 72% | 68–71(*) % |  |  |  |