Table 2.
The CT number changes of several tissues according to the energy level.
| Polyenergetic images | ||||||
|---|---|---|---|---|---|---|
| Tube voltage (kVp) | 100 | 120 | 140 | |||
| Left ventricle (HU) | 459.7 ± 84.5 | 358.7 ± 62.5 | 257.2 ± 41.2 | |||
| Myocardium (HU) | 100.9 ± 20.4 | 86.4 ± 13.7 | 71.3 ± 9.2 | |||
| Pericardial fat (HU) | −96.1 ± 11.3 | −86.2 ± 10.9 | −76.8 ± 13.0 | |||
| Vertebrae (HU) | 1034.0 ± 156.3 | 912.4 ± 140.7 | 790.1 ± 125.7 | |||
|
| ||||||
| Monoenergetic images | ||||||
| Effective energy (keV) | 40 | 70 | 100 | 130 | 160 | 190 |
|
| ||||||
| Left ventricle (HU) | 1218.0 ± 240.0 | 446.5 ± 78.7 | 247.6 ± 38.5 | 178.0 ± 25.7 | 147.7 ± 20.9 | 132.6 ± 18.9 |
| Myocardium (HU) | 211.4 ± 77.5 | 98.8 ± 19.1 | 69.7 ± 8.9 | 59.6 ± 9.7 | 55.1 ± 10.9 | 53.0 ± 11.6 |
| Pericardial fat (HU) | −177.2 ± 43.8 | −97.2 ± 10.8 | −76.6 ± 12.1 | −69.3 ± 14.2 | −66.2 ± 15.4 | −64.6 ± 15.9 |
| Vertebrae (HU) | 1949.0 ± 276.7 | 1019.0 ± 153.3 | 778.7 ± 124.2 | 694.8 ± 114.5 | 658.3 ± 110.5 | 640.0 ± 108.5 |
CT: computed tomography.