Table 1.
Summary of CSCT and CCTA protocols
| Parameter | Reference CSCT | CCTA |
|---|---|---|
| Technique | Axial | Axial |
| Tube voltage [kVp] | 120 | 120 |
| Automatic exposure control | Clinical CARE keV IQ level 16 | Clinical CARE keV IQ level 65 |
| CTDIvol | 3.3 | 18.3 |
| Collimation [mm] | 144 × 0.4 | 144 × 0.4 |
| Field of View [mm] | 220 | 220 |
| Rotation time [s] | 0.25 | 0.25 |
| Slice thickness/increment [mm] | 3.0/1.5 |
0.4/0.2 3.0/1.5 |
| Reconstruction kernel | Qr36 | Qr44/Qr36 |
| Matrix size [pixels] |
Automatic 512 × 512 |
Automatic 512 × 512 |
| Reconstruction method | QIR off | QIR off, QIR strength 2 |
| monoE level [keV] | 70 | 70 |
| Repetitions | 5 | 5 |
| Artery velocity [mm/s] | 0, 10, 20 | 0, 10, 20 |
| Scan length [cm] | 10 | 10 |
CSCT calcium scoring computed tomography, CCTA coronary computed tomography angiography, IQ image quality, QIR quantum iterative reconstruction, CTDIvol Volumetric CT dose index