Table 1. Baseline Characteristics of Study Population.
| Patient Characteristics | n = 46 |
|---|---|
| Men | 25 (54.3) |
| Age | 58 ± 13.8 years |
| Cardiovascular risk factors | |
| Diabetes mellitus | 8 (17.4) |
| Systemic hypertension | 23 (50.0) |
| Hypercholesterolemia | 12 (26.1) |
| Current smoking | 9 (19.6) |
| Patient with significant CAD* | 6 (13.0) |
| Body mass index (kg/m2) | 25.3 ± 3.8 |
| Cardiac CT† | |
| Heart rate (beats/min) | 64.4 ± 11.6 (range, 44–98) |
| Effective radiation dose (mSv)‡ | 7.99 ± 1.24 (range, 5.54–10.45) |
| Data volume (GB) | |
| Dataset A | 3.08 ± 0.29 |
| Dataset B | 1.54 ± 0.14 |
| Dataset C | 0.67 ± 0.09 |
| Dataset D | 0.35 ± 0.03 |
| LV end-diastolic volume (mL) | |
| Dataset A | 130.8 ± 30.4 |
| Dataset B | 129.6 ± 30.9 |
| Dataset C | 111.3 ± 29.6 |
| Dataset D | 110.9 ± 29.5 |
| LV end-systolic volume (mL) | |
| Dataset A | 45.7 ± 16.8 |
| Dataset B | 46.7 ± 16.9 |
| Dataset C | 36.2 ± 16.6 |
| Dataset D | 36.7 ± 16.4 |
| LV ejection fraction (%) | |
| Dataset A | 65.5 ± 7.5 |
| Dataset B | 64.4 ± 7.3 |
| Dataset C | 68.3 ± 8.2 |
| Dataset D | 67.6 ± 8.2 |
| Echocardiography-LV ejection fraction (%) | 63.0 ± 4.4 |
Data are expressed as mean ± standard deviation or n (%). *CAD was defined as coronary artery diameter stenosis ≥ 50%, †Images are reconstructed with slice thickness/increment of 0.9/0.9 mm at 5% RR-interval in dataset A, with 0.9/0.9 mm at 10% in dataset B, with 3/3 mm at 5% in dataset C, and finally 3/3 mm at 10% in dataset D, ‡Radiation dose was determined by dose length product, which was converted to mSv by conversion factor of 0.014. CAD = coronary artery disease, GB = gigabytes, LV = left ventricle, mSv = millisievert