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ORIGINAL ARTICLE
Year : 2015  |  Volume : 1  |  Issue : 1  |  Page : 28-33

Application study of 640-slice computed tomography low dose coronary angiography


Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei Province, China

Correspondence Address:
Ziqiao Lei
Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei Province
China
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Source of Support: This project was supported by the Natural Science Foundation of Hubei Province, China (No. 2014CFB986), Conflict of Interest: None declared.


DOI: 10.4103/2226-8561.143948

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Objective: The aim was to explore image quality and radiation dose in patients with different heart rates in 640-slice volume computed tomography (CT) coronary angiography by using tube voltage of 100 kV. Materials and Methods: The 220 consecutive patients clinically suspected or confirmed of coronary artery disease were divided into three groups: 67 cases in 1 beat group (heart rate <65 bpm); 134 cases in 2 beats group (65 bpm ≤heart rate <80 bpm); 19 cases in 3 beats group (heart rate >80 bpm). When scanning was completed, the best phase for coronary arteries would be chosen. Various postprocessing reconstructions of coronary arteries and branches, such as volume reconstruction (VR), maximum density projection, multiplanar reconstruction, curved surface reconstruction, were used. We classified image quality and made statistical analysis according to 4-grades method. We also compared scalability of coronary arterial segments and radiation doses between the groups. Results: There were no significant differences in the scalability of coronary arterial segments between the groups. Effective radiation doses of the three groups were (2.5±0.8) mSv, (8.4±3.1) mSv and (11.2±3.8)mSv. The radiation doses between the groups showed statistical difference (P < 0.05). Conclusion: 640-slice volume CT can be adapted to changes during heart rate, and ensure the image quality under the condition of 100 kV, and radiation doses were significantly reduced in patients with heart rate <65 bpm.


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