How to use a prospective gated technique for cardiac CT.
How to use a prospective gated technique for cardiac CT.
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DOI：
10.1016/j.jcct.2008.10.013
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发表时间：
2009-01-01
影响因子：
5.4
通讯作者：
Earls, James P
中科院分区：
文献类型：
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作者：
Earls, James P
最近，一种前瞻性心电图门控技术被调整用于冠状动脉和心脏多探测器行CT研究。最广泛使用的前瞻性门控形式使用“步进-拍摄”轴向数据采集、增量移动床、自适应心电图触发、改进的图像重建算法和多相重建能力。研究表明，与回顾性门控相比，有效辐射剂量减少了77%-87%，相当于显著改善了图像质量。与传统血管造影术的比较证明，它与回顾性门控检测冠状动脉狭窄一样准确。该技术并不适用于所有患者，因为临床使用有一些限制，包括有限数量的重建相位和68-75次/分钟的最大扫描心率。然而，通过仔细选择患者和有效的心率控制，前瞻性门控可以用于心脏CT检查的高比例。本文回顾了前瞻性门控的扫描和患者选择协议，并讨论了如何在临床实践中使用。
A prospective, electrocardiographically gated technique was recently adapted for use with coronary and cardiac multidetector row CT studies. The most widely available form of prospective gating uses "step-and-shoot" axial data acquisition, an incrementally moving table, adaptive electrocardiographic triggering, an improved image reconstruction algorithm, and multiphase reconstruction capability. Studies have shown a 77%-87% effective radiation dose reduction compared with retrospective gating and equal to significantly improved image quality. Comparison with conventional angiography has proven it to be as accurate as retrospective gating for coronary stenosis detection. The technique is not applicable to all patients because there are some restrictions for clinical use, including a limited number of reconstructed phases and a maximum scan heart rate of 68-75 beats/min. However, with careful patient selection and effective heart rate control, prospective gating can be used in a high percentage of cardiac CT examinations. This article reviews the scanning and patient selection protocols for prospective gating and discusses how it may be used in clinical practice.