Characteristics of CT Used for Attenuation Correction in Our Study and of Typical Diagnostic Thoracic Spiral CT at Our Institution
| Characteristic | Study CT | Typical CT |
|---|---|---|
| X-ray tube current (mA) | 2.5 | 80 |
| X-ray tube voltage (kVp) | 140 | 120 |
| Slice width (mm) | 10 | 3 |
| Field of view | Left ventricle (ascending aorta to apex) | Entire thorax |
| Scan time | 5 min (13-cm average field of view) | 8–10 s |
| Axial resolution (mm) | 10 | 0.7 |
| Breath-hold | No (tidal breathing) | Yes |
| Use of intravenous contrast material | No | Yes (unless contraindicated) |
| Radiation | <1 mSv | 5–6 mSv |