Dual-Energy CT: New Horizon in Medical Imaging.
Dual-Energy CT: New Horizon in Medical Imaging.
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DOI：
10.3348/kjr.2017.18.4.555
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发表时间：
2017-07
影响因子：
4.8
通讯作者：
Goo JM
中科院分区：
文献类型：
--
作者：
Goo HW;Goo JM
在过去十年中，双能 CT 仍未得到充分利用，这可能是由于繁琐的工作流程问题和当前的技术限制。应让临床放射科医生意识到双能 CT 相对于单能 CT 的潜在临床益处。为了实现这一目标，需要详细阐述双能CT的基本原理、当前采集方法的优缺点以及临床应用中的各种材料特异性成像方法。目前的双能CT采集方法包括带或不带束过滤的双管、快速电压切换、双层探测器、分流过滤技术和顺序扫描。双能材料特异性成像方法包括虚拟单能或单色成像、有效原子序数图、虚拟非对比或非增强成像、虚拟非钙成像、碘图、吸入氙图、尿酸成像、自动去骨和肺血管分析。在这篇综述中，我们重点关注双能CT成像，包括患者辐射暴露的相关问题、扫描和后处理选项以及潜在的临床益处，主要是为了提高临床放射科医生的认识，从而扩大双能CT的临床应用；此外，我们还简要介绍了双能CT当前的技术局限性以及光子计数探测器的当前发展。
Dual-energy CT has remained underutilized over the past decade probably due to a cumbersome workflow issue and current technical limitations. Clinical radiologists should be made aware of the potential clinical benefits of dual-energy CT over single-energy CT. To accomplish this aim, the basic principle, current acquisition methods with advantages and disadvantages, and various material-specific imaging methods as clinical applications of dual-energy CT should be addressed in detail. Current dual-energy CT acquisition methods include dual tubes with or without beam filtration, rapid voltage switching, dual-layer detector, split filter technique, and sequential scanning. Dual-energy material-specific imaging methods include virtual monoenergetic or monochromatic imaging, effective atomic number map, virtual non-contrast or unenhanced imaging, virtual non-calcium imaging, iodine map, inhaled xenon map, uric acid imaging, automatic bone removal, and lung vessels analysis. In this review, we focus on dual-energy CT imaging including related issues of radiation exposure to patients, scanning and post-processing options, and potential clinical benefits mainly to improve the understanding of clinical radiologists and thus, expand the clinical use of dual-energy CT; in addition, we briefly describe the current technical limitations of dual-energy CT and the current developments of photon-counting detector.