Table 1. Comparison of radiation dose between RD-CT and LD-CT scans.
| Parameters | RD scans | LD scans | P value |
|---|---|---|---|
| Plain scans | |||
| CTDIvol (mGy) | 10.65±0.96 | 4.39±0.34 | 0.000 |
| Scan length chest (cm) | 17.38±1.62 | 16.27±2.03 | 0.569 |
| Scan length abdomen (cm) | 50.04±4.36 | 50.48±3.96 | 0.372 |
| ED (mSv) | 10.58±1.28 | 4.32±0.73 | 0.000 |
| Arterial phase | |||
| CTDIvol (mGy) | 10.65±0.96 | 4.42±0.47 | 0.000 |
| Scan length chest (cm) | 17.38±1.62 | 16.27±2.03 | 0.569 |
| Scan length abdomen (cm) | 25.85±2.65 | 26.73±2.40 | 0.625 |
| ED (mSv) | 4.53±0.67 | 2.78±0.52 | 0.000 |
| Portal vein phase | |||
| CTDIvol (mGy) | 10.65±0.96 | 4.51±0.39 | 0.000 |
| Scan length abdomen (cm) | 46.90±3.86 | 47.35±3.92 | 0.783 |
| ED (mSv) | 7.49±0.86 | 3.20±0.62 | 0.000 |
| Delayed phase | |||
| CTDIvol (mGy) | 10.65±0.96 | 4.78±0.52 | 0.000 |
| Scan length abdomen (cm) | 26.85±2.65 | 25.73±2.40 | 0.625 |
| ED (mSv) | 4.29±0.54 | 1.84±0.22 | 0.000 |
| In total | |||
| CTDIvol (mGy) | 42.60±3.84 | 18.10±1.72 | 0.000 |
| ED (mSv) | 26.89±3.35 | 12.14±2.09 | 0.000 |
CTDIvol, CT dose index volume; ED, effective radiation dose; RD, routine dose computed tomography; LD, low dose; CT, computed tomography.