Table 3.
Estimates of effective dose (E)
| E range in mSv (mean) | ECG tube modulation | |
|---|---|---|
| Average background radiation (United States) | 1.0-10 (3.6) | - |
| Conventional coronary angiography | 3.1-21.8 (5.6) | - |
| Nuclear MPI studies | 2.2-31.5 | - |
| Ca scoring (retrospectively gated helical) | 1.0-6.2 | - |
| Ca scoring (prospectively gated axial) | 1.0-3.0 | - |
| CTCA (retrospectively gated helical) | ||
| 16-slice | 5.7-13 | No |
| 16-slice | 2.9-5.6 | Yes |
| 64-slice | 9.4-21.4 | Yes |
| 64-slice dual source | 7.8-16.9 | Yes |
| 320-slice | 10.1-18.1 | No |
| CTCA (prospectively gated axial) | ||
| 64-slice | 0.75-6.7 (2.8) | - |
| 320-slice | 4.9-16.5 | - |