Table 3.
Parameters of LSIM and contrast-enhanced computed tomography.
| Total (n = 30) | mPAP ≥30 mmHg (N = 12) | mPAP <30 mmHg (N = 18) | |
|---|---|---|---|
| Parameters of LSIM images | |||
| Total lung volume (mm3) | 2,991.7 (2,678.6–3,575.7) | 2,986.8 (2,856.1–3,496.9) | 3,102.6 (2,671.7–3,607.2) |
| Area with 0–10 HU (mm3) | 200.5 (143.7–388.9) | 416.5 (175.8–646.1) | 159.2 (137.8–228.9) |
| 0–10 HU area/total lung volume (%) | 6.7 (4.9–11.4) | 12.6 (7.8–20.6) | 5.6 (4.7–6.8) |
| Area with 0–15 HU (mm3) | 422.1 (301.3–791.7) | 856.2 (350.5–1,260.2) | 378.6 (297.8–535.8) |
| 0–15 HU area/total lung volume (%) | 14.6 (10.5–25.2) | 25.7 (15.9–38.9) | 12.7 (9.7–15.4) |
| Area with 0–20 HU (mm3) | 672.9 (451.2–1,068.2) | 1,036.6 (448.9–1,478.6) | 597.0 (454.4–836.0) |
| 0–20 HU area/total lung volume (%) | 22.27 (14.62–34.02) | 35.4 (20.3–43.6) | 19.1 (14.2–27.1) |
| Area with 0–30 HU (mm3) | 1,425.1 (988.7–2,098.5) | 1,675.4 (917.2–2,332.6) | 1,316.1 (1,087.2–1,698.0) |
| 0–30 HU area/total lung volume (%) | 46.06 (35.48–60.42) | 60.0 (39.6–67.0) | 41.2 (35.5–52.2) |
| PA diameter (mm) | 30.8 (28.4–32.8) | 30.8 (28.8–32.2) | 31.0 (26.0–33.3) |
| AA diameter (mm) | 30.8 (28.5–33.5) | 30.1 (28.4–31.8) | 31.2 (28.9–35.89 |
| PA/AA ratio | 0.966 (0.853–1.107) | 1.012 (0.895–1.097) | 0.962 (0.807–1.107) |
| RV diameter (mm) | 42.9 (36.0–48.0) | 47.1 (40.8–51.2) | 38.3 (33.0–45.6) |
| LV diameter (mm) | 38.5 (32.5–46.3) | 32.9 (27.0–45.2) | 41.2 (35.2–46.7) |
| RV/LV ratio | 1.004 (0.896–1.289) | 1.297 (1.070–1.770) | 0.953 (0.829–1.043) |
Data are presented as median (interquartile range). mPAP, mean pulmonary arterial pressure; LSIM, lung subtraction iodine mapping; PA, pulmonary artery; AA, ascending aorta; RV, right ventricle; LV, left ventricle; PA/AA ratio, main pulmonary artery diameter to ascending aortic diameter ratio; RV/LV ratio, right ventricular diameter to left ventricular diameter ratio.