Dual-source cardiac computed tomography: image quality and dose considerations
Dual-source cardiac computed tomography: image quality and dose considerations
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DOI：
10.1007/s00330-008-0883-3
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发表时间：
2008-06-01
影响因子：
5.9
通讯作者：
Kalender, Willi A.
中科院分区：
文献类型：
--
作者：
Achenbach, Stephan;Anders, Katharina;Kalender, Willi A.
心脏的计算机断层扫描 (CT) 成像，尤其是冠状动脉 CT 血管造影，目前引起了人们的浓厚兴趣，并越来越多地纳入临床决策。尽管过去十年 CT 技术取得了巨大进步，但有限的时间分辨率仍然是最严重的问题之一，特别是对于心脏成像而言。双源 CT (DSCT) 的新颖设计理念可实现 83 毫秒的有效扫描时间，与心率无关。虽然仍缺少大型试验，但初步研究表明图像质量有所改善，特别是在冠状动脉可视化和检测冠状动脉狭窄方面。进一步的研究表明，为了可靠地获得诊断图像质量，不需要常规的β阻断来降低心率。其他可能特别受益于时间分辨率提高的应用是心室功能和心脏瓣膜的分析。详细讨论了心脏 CT 普遍关注的剂量问题，包括剂量值和三维剂量分布的定量分析。目前有多种降低辐射暴露的策略，而 DSCT 在这方面提供了特殊的潜力。
Computed tomography (CT) imaging of the heart, most prominently coronary CT angiography, is currently subject to intense interest and is increasingly incorporated into clinical decision-making. In spite of tremendous progress in CT technology over the past decade, the limited temporal resolution has remained one of the most severe problems, especially for cardiac imaging. The novel design concept of dual-source CT (DSCT) allows for an effective scan time of 83 ms independent of heart rate. While large trials are still missing, initial studies have shown improved image quality, especially for visualizing the coronary arteries and detecting coronary artery stenoses. Further investigations have shown that routine beta blockade to lower the heart rate is not necessary to reliably achieve diagnostic image quality. Other applications that may particularly benefit from increased temporal resolution are the analysis of ventricular function and of the cardiac valves. Dose issues which are of interest for cardiac CT in general are discussed in some detail, including a quantitative analysis of dose values and three-dimensional dose distributions. Various strategies to lower radiation exposure are available today, and DSCT offers specific potential for this.