Table 2. LDCT Scanners and Scanning Parameters Used in Our Pilot Study for K-LUCAS Project.
| Total (n = 256) | GE Discovery 750 (n = 32) | GE Revolution (n = 9) | Somatom Definition (n = 101) | Somatom Definition Flash (n = 22) | Brilliance 64 (n = 92) |
|---|---|---|---|---|---|
| Scanning parameters | |||||
| Scan mode | Spiral | Spiral | Spiral | Spiral | Spiral |
| Rotation time (s) | 0.5 | 0.5 | 0.33 | 0.28 | 0.5 |
| Collimation (mm) | 0.625 × 64 | 0.625 × 64 | 0.6 × 32 × 2 | 0.6 × 64 × 2 | 0.625 × 64 |
| Pitch | 0.984 | 0.984 | 1 | 1 | 1 |
| kVp | 120 (n = 3) | 100 | 120 | 120 | 120 |
| 100 (n = 29) | |||||
| mAs | 50 | 30 | 30 (n = 1) | 25 (n = 18) | |
| 50 (n = 4) | |||||
| Reference mAs | 25 (n = 100) | 26 | |||
| Reconstruction | |||||
| Slice thickness/interval (mm) | 1.25/1.25 for axial images | 1.25/1.25 for axial images | 1/1 for axial images | 1/1 for axial images | 1/1 for axial images |
| 2.5/2.5 for axial and coronal images | 2.5/2.5 for axial and coronal images | 3/3 for axial and coronal images | 2.5/2.5 for axial images | ||
| Reconstruction algorithm | Lung for 1.25-mm images | Lung for 1.25-mm images | B50 for 1-mm images | I70f for 1-mm images | YA for 1-mm images |
| Standard for 2.5-mm images | Standard for 2.5-mm images | B31 for 3-mm images | I50f for 3-mm images | A for 2.5-mm images | |
| Iterative reconstruction | ASIR 50 | ASIR-V 50 | SAFIRE level 2 | SAFIRE level 1 |
ASIR = adaptive statistical iterative reconstruction, LDCT = low-dose chest computed tomography, SAFIRE = Sinogram Affirmed Iterative Reconstruction