Table 2.
Body size and radiation dose of 1178 patients.
| Anatomic region | CT scanner | Number (n) | d w (cm) | f | CTDIvol (mGy) | SSDE (mGy) |
|---|---|---|---|---|---|---|
| Chest | 40- and 128-slice | 616 | 24.47 ± 2.36 | 1.53 ± 0.16 | 7.26 ± 2.33 | 10.66 ± 2.75 |
| 40-slice | 264 | 24.53 ± 2.36 | 1.53 ± 0.16 | 6.25 ± 1.81 | 9.08 ± 1.82 | |
| 128-slice | 352 | 24.42 ± 2.37 | 1.53 ± 0.16 | 8.02 ± 2.38 | 11.84 ± 2.73 | |
|
| ||||||
| Abdomen-pelvis | 40- and 128-slice | 562 | 25.50 ± 2.37 | 1.46 ± 0.15 | 9.66 ± 2.21 | 13.72 ± 1.83 |
| 40-slice | 239 | 25.38 ± 2.35 | 1.47 ± 0.15 | 9.60 ± 2.35 | 13.65 ± 2.06 | |
| 128-slice | 323 | 25.61 ± 2.38 | 1.46 ± 0.15 | 9.71 ± 2.12 | 13.77 ± 1.65 | |
Abbreviation: dw: water-equivalent diameter; f: size-dependent conversion factor; CTDIvol: volume CT dose index; SSDE: size-specific dose estimate.