Table 1. Patient characteristics and scan-related parameters.
| Patient characteristics (N = 24 patients) | |
| Men / women | 18 / 6 |
| Age (years) (mean ± SD) | 61.2 ± 9.6 |
| BMI (kg/m2) (mean ± SD) | 29.6 ± 6.7 |
| Smoker (n*, %) | 11 (46) |
| Hypertension (n, %) | 13 (54) |
| Hypercholesterolemia (n, %) | 17 (71) |
| Diabetes (n, %) | 4 (17) |
| Stented segments / patient (mean ± SD) | 2.96 ± 1.27 |
| Time interval between stent implantation and CT (days) (mean ± SD) (range) | 17.3 ± 3.4 (11–22) |
| Scan-related parameters | |
| Mean heart rate during scan (bpm) (mean ± SD) | 54.6 ± 7.8 |
| Heart rate variability ** during scan (bpm) (mean ± SD) | 2.7 ± 6.9 |
| Prescan betablocker administration, n (%) | 14 (58.3) |
| Prescan nitroglycerin administration, n (%) | 19 (79.2) |
| Contrast agent (ml) (mean ± SD) | 96.0 ± 10.5 |
| DLP *** (mGy-cm) (mean ± SD) | 380.2 ± 65.0 |
| Effective dose **** (mSv) (mean ± SD) (range) | 5.3 ± 0.9 (3.7–6.9) |
Standard deviation (SD); body mass index (BMI); beats per minutes (bpm)
*: n, number of patients
**: The standard deviation of the heart rate in a given patient was the parameter used for heart rate variability measurement.
***: DLP, dose-length product for MDCT angiography
****: The effective radiation dose was estimated by the product of the DLP and a conversion coefficient for the chest (k = 0.014 mSv*mGy−1*cm−1). Prospective ECG-gating was used in all patients.