Title: Dual-source CT angiography of the coronary arteries: comparison with 64-slice spiral CT
Abstract: Objective To compare the image quality and visibility of coronary arteries by dual-source CT (DSCT) and 64-slice CT. Methods 100 patients (group A, 54 male, aged 57.9±11.3 years) with suspected coronary artery disease (CAD) were examined by DSCT. The other 100 patients (group B, 59 male, aged 58.0±11.1 years) with suspected CAD were studied by 64-slice spiral CT. Patients of group B with a heart rate above 70 bpm received oral β-blockers before the scan. Data were retrospectively reconstructed and reviewed by two observers. Image quality was assessed using a 3-point grading scale from excellent (1) to non-assessable (3) and the rate of displayed coronary segments was calculated. The optimal reconstruction phase was registered for each patient. Results The mean heart rates of group A was significantly higher than that of group B [(71±12) bpm vs (61±6) bpm; P0.05]. The mean scan time of group A was significantly shorter than that of group B [(7.95±1.01) s vs (11.85±0.89) s; P0.01]. In the evaluation of image quality, no significant difference was found between the two groups (1.31±0.53 vs 1.25±0.50; P0.05). The rates of diagnostic coronary segments for two groups were 98.9% and 99.1%, respectively (P0.05). For patients with heart rates 70 bpm, most optimal reconstruction phase ranged from 50% to 80%; For patients with heart rates ≥70 bpm, that ranged from 30% to 80%. Conclusion With high and heart rate independent temporal resolution, DSCT provides high diagnostic image quality in a wide range of heart rates as compared to 64-slice CT and is promising for clinical use.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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