Table 1.
List of Scanners and Scan Parameters Used in the Study.
| Manufacturer/Model | Reconstruction Kernel | Scan Type | Slice Thickness | Pixel Spacing (mm) | Spiral Pitch Factor | kVp | Image Quality Reference Parameter | Indicated CTDIvol (mGy) |
|---|---|---|---|---|---|---|---|---|
| GE Discovery CT750 HD |
Standard/Lung | Helical | 5mm | 0.762 | 0.984 | 120 | NI 14 | 9.33 |
| Phillips Brilliance 16 |
Standard(B)/Lung (L) | Helical | 5 mm | 0.762 | 0.938 | 120 | 150 mAs/Slice | 9.20 |
| Siemens Somatom Definition AS |
Standard – B40f Lung – B60f |
Helical | 5 mm | 0.762 | 0.951 | 120 | QRM 253 | 9.34 |
kVp indicates kilovoltage peak; mAs is milliampere-second. NI = Noise index. QRM = Quality Reference mAs.