Table 2. Differences between the follow-up examinations in radiation exposure, scan parameters and maximal effective abdominal diameter.
| Contrast-enhanced CT of the chest | Non-enhanced CT of the liver | Contrast-enhanced CT of the abdomen | |
|---|---|---|---|
| Δ CTDIvol [mGy] | |||
| Median: | 0.4 | 0.65 | 0.59 |
| 95% CI for the median: | 0.37 to 0.50 | 0.51 to 0.73 | 0.51 to 0.71 |
| IQR: | 0.63 | 0.78 | 0.88 |
| range: | 0 to 5.5 | 0 to 5.8 | 0 to 5.0 |
| Δ DLP [mGy*cm] | |||
| Median: | 21.0 | 19.0 | 37.0 |
| 95% CI for the median: | 17.4 to 23.6 | 15.4 to 21.0 | 27.4 to 42.0 |
| IQR: | 31.0 | 23 | 50.5 |
| range: | 0 to 194 | 0 to 174 | 0 to 315 |
| Δ scan length [cm] | |||
| Median: | 1.4 | 1.3 | 1.5 |
| 95% CI for the median: | 1.1 to 1.6 | 1.0 to 1.5 | 1.2 to 2.0 |
| IQR: | 1.7 | 1.7 | 2.8 |
| Δ table height [cm] | |||
| Mean: | 1.1 | 1.1 | 1.1 |
| 95% CI for the median: | 0.9 to 1.3 | 0.9 to 1.3 | 0.9 to 1.3 |
| IQR: | 1.3 | 1.3 | 1.3 |
| Δ tube voltage | |||
| 0 kV (n) | 160 | 146 | 180 |
| 20 kV (n) | 20 | 34 | 0 |
| Δ mean mAs | |||
| Median: | 6.4 | 7.9 | 8.8 |
| 95% CI for the median: | 5.4 to 7.8 | 6.1 to 9.1 | 7.1 to 10.4 |
| IQR: | 16.9 | 12.8 | 12.8 |
| Δ max. effective diameter [cm] | |||
| Median: | 0.5 | 0.5 | 0.5 |
| 95% CI for the median: | 0.4 to 0.6 | 0.4 to 0.6 | 0.4 to 0.6 |
| IQR: | 0.7 | 0.7 | 0.7 |
Abbreviations: CTDIvol = volume computed tomography dose index, DLP = dose-length-product, CI = confidence interval, IQR = interquartile range.