| Radiation parameters | Tube voltage (kV) | |||||
| 120 (n = 45) | 120 (n = 36) | 120 (n = 14) | 100 (n = 16) | 100 (n = 6) | 100 (n = 3) | |
| ECG pulsing window (%) | 70–70 | 70–70 | 70–70 | 70–70 | 70–70 | 70–70 |
| Heart rate (bpm) | <60 | 60–70 | >70 | <60 | 60–70 | >70 |
| Mean scan length (mm) | 135 (26) | 134 (22) | 112 (22) | 123 (10) | 120 (11) | 127 (12) |
| Mean DLP (mGy*cm) | 594 (259) | 537 (128) | 461 (120) | 237 (84) | 205 (131) | 162 (14) |
| Mean CTDIvol (mGy) | 35 (13) | 33 (8) | 25 (8) | 15 (5) | 10 (2) | 9 (1) |
| Estimated mean radiation dose (mSv) | 10.1 (4.4) | 9.1 (2.2) | 7.8 (2.2) | 4.0 (1.5) | 3.5 (2.5) | 3.1 (1.1) |
Results are shown as mean (SD) unless stated otherwise.
Minimum tube current for dose estimates calculated is 4% of full tube current level.
CTDIvol, volume computed tomography dose index; DLP, dose–length product.