Patient Demographics and Computed Tomography Factors Analyzed Before and After Iterative Reconstruction Presented by Analysis Phase
| Assessment Timepoint | |||
|---|---|---|---|
| Phase/Variables | Pre-ASIR, July | Post-ASIR, November | |
| Phase 1 | n=243 | n=233 | P-Value |
| Mean age, years, all patients (range) | 52 ± 20 (10-92) | 53 ± 20 (4-94) | 0.59 |
| Male, n (%) | 112 (46) | 106 (45) | |
| Male mean age, years (range) | 53 ± 18 (10-87) | 56 ± 20 (4-89) | 0.45 |
| Female, n (%) | 131 (54) | 127 (55) | |
| Female mean age, years (range) | 51 ± 21 (16-92) | 51 ± 21 (20-94) | 1.0 |
| Mean CTDIvol, mGy | 17.5 ± 5.7 | 11.0 ± 6.0 | <0.001 |
| Mean AP dimension, cm | 26.4 ± 5.3 | 26.1 ± 5.0 | 0.48 |
| Mean lateral dimension, cm | 34.4 ± 4.9 | 34.3 ± 5.1 | 0.80 |
| Mean AP+lateral dimensions, cm | 60.8 ± 9.8 | 60.3 ± 9.8 | 0.62 |
| Mean length of scan, cm | 45.1 ± 7.5 | 43.7 ± 10.4 | 0.08 |
| Mean SSDE (AP), mGy | 20.3 ± 4.6 | 12.5 ± 5.1 | <0.001 |
| Mean SSDE (AP+lateral), mGy | 20.8 ± 5.0 | 12.7 ± 5.1 | <0.001 |
| Mean number of phases | 1.27 ± 0.60 | 1.29 ± 0.63 | 0.79 |
| Pre-ASIR, July | Post-ASIR, November | ||
| Phase 2 | n=199 | n=184 | |
| Mean age, years, all patients (range) | 52 ± 20 (10-92) | 52 ± 21 (4-94) | 1.0 |
| Male, n (%) | 90 (45) | 84 (46) | |
| Male mean age, years (range) | 54 ± 19 (10-87) | 53 ± 21 (4-89) | 0.74 |
| Female, n (%) | 109 (55) | 100 (54) | |
| Female mean age, years (range) | 50 ± 21 (16-92) | 50 ± 21 (20-94) | 1.0 |
| Mean number of phases | 1.3 ± 0.6 | 1.3 ± 0.6 | 0.79 |
| Mean DLP, mGy*cm | 1,076 ± 527 | 715 ± 512 | <0.001 |
| Pre-ASIR, June/July | Post-ASIR, October/November | ||
| Phase 3 | n=408 | n=389 | |
| Mean age, years, all patients (range) | 52 ± 20 (6-97) | 50 ± 21 (4-94) | 0.17 |
| Male, n (%) | 157 (38) | 171 (44) | |
| Male mean age, years (range) | 54 ± 19 (10-97) | 52 ± 21 (4-93) | 0.37 |
| Female, n (%) | 251 (62) | 218 (56) | |
| Female mean age, years (range) | 51 ± 21 (6-93) | 49 ± 21 (7-94) | 0.31 |
| Mean number of phases | 1.2 ± 0.5 | 1.3 ± 0.6 | 0.15 |
| Mean DLP, mGy*cm | 1,069 ± 634 | 676 ± 480 | <0.001 |
AP, anterior-posterior; ASIR, adaptive statistical iterative reconstruction; CDTIvol, computed tomography dose index volume; DLP, dose length product; SSDE, size-specific dose estimate.