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CT imaging protocols.
| Projection gating | Cardiac phases | Energies | Projection No. | Sampling time (min) | mAs/projection (80, 40 kVp) | Approximate dose (mGy) |
|---|---|---|---|---|---|---|
| Prospective | 10 | Dual | 6000 | 40 | 1.6, 4 | 1300 |
| Retrospective | 10 | Single | 2250 | 5 | 1, 2 | 290 |
| Low dose retrospective | 10 | Dual | 450 | <1 | 1, 2 | 60 |
