Table 2.
Radiation dose and contrast volume of study protocols
| Protocol | Tube current-time product (mAs) | Radiation dose - CTDIvol (mGy) | Relative radiation dose (%) | Contrast media volume (mL) | Relative contrast media volume (%) |
|---|---|---|---|---|---|
| A1 | 33 (31, 35) | 3.8 (3.6, 4.0) | 100 | 23 (21, 24) | 100 |
| A2 | 21 (19, 22) | 2.4 (2.3, 2.5) | 63 | 23 (21, 24) | 100 |
| A3 | 33 (31, 35) | 3.8 (3.6, 4.0) | 100 | 18 (16, 19) | 78 |
| B1 | 21 (20, 23) | 2.4 (2.2, 2.5) | 63 | 23 (21, 24) | 100 |
| B2 | 34 (32, 36) | 3.9 (3.7, 4.1) | 102 | 18 (16, 19) | 78 |
| B3 | 15 (13, 15) | 1.6 (1.5, 1.8) | 42 | 28 (25, 29) | 122 |
Values are provided in median (Q1, Q3). B1/2/3 and A1/A2: p < 0.001 for tube current and radiation dose measurements; others were not significant. Protocol A1 was set as reference for percentage calculation. CTDIvol was used
CTDIvol volume CT dose index, CM contrast media