Table 1.
Scan protocol parameters of both helical and high-pitch acquisitions
| Protocol | Cardiac | Aorta |
|---|---|---|
| Mode | Spiral | High pitch |
| Collimation (mm) | 0.6 | 0.6 |
| Acquisition (mm) | 128*0.6 | 128*0.6 |
| Tube voltage (kVp) | 80 | 70/80 (group 1/group 2) |
| Dose modulation | off | On |
| Tube current (mAs) mAsref | 370 | 400 |
| mAseff | 370 | 90–122 |
| Rot. time (s) | 0.28 | 0.28 |
| Pitch | 0.23 | 3.0 |
| Delay (s) | Test bolus technique | Test bolus technique |
| Scan time (s) | 6–7 | 2 |
| Direction | Caudo-cranial | Cranio-caudal |
| Reconstruction 1 | Best Systolic – 20 % | |
| Slice thickness (mm) | 0.6 | 2.0 |
| Increment (mm) | 0.4 | 1.4 |
| Kernel | I26f | I30f |