Department of Radiology, Massachusetts General Hospital, 55 Fruit Street, White 270, Boston, MA 02114, USA.
Department of Radiology, NYU Langone Health, 660 1st Avenue, New York, NY 10016, USA.
Radiol Clin North Am. 2023 Nov;61(6):945-961. doi: 10.1016/j.rcl.2023.05.002. Epub 2023 Jul 31.
Compared to conventional single-energy CT (SECT), dual-energy CT (DECT) provides additional information to better characterize imaged tissues. Approaches to DECT acquisition vary by vendor and include source-based and detector-based systems, each with its own advantages and disadvantages. Despite the different approaches to DECT acquisition, the most utilized DECT images include routine SECT equivalent, virtual monoenergetic, material density (eg, iodine map), and virtual non-contrast images. These images are generated either through reconstructions in the projection or image domains. Designing and implementing an optimal DECT workflow into routine clinical practice depends on radiologist and technologist input with special considerations including appropriate patient and protocol selection and workflow automation. In addition to better tissue characterization, DECT provides numerous advantages over SECT such as the characterization of incidental findings and dose reduction in radiation and iodinated contrast.
与传统的单能量 CT（SECT）相比，双能量 CT（DECT）提供了更多的信息来更好地描述成像组织。DECT 的采集方法因供应商而异，包括基于源和基于探测器的系统，每种方法都有其自身的优点和缺点。尽管 DECT 的采集方法不同，但最常用的 DECT 图像包括常规 SECT 等效图像、虚拟单能量图像、物质密度（例如碘图）和虚拟非对比图像。这些图像是通过在投影域或图像域中的重建生成的。将最佳的 DECT 工作流程设计并实施到常规临床实践中，取决于放射科医生和技术人员的输入，其中包括适当的患者和方案选择以及工作流程自动化等特殊考虑因素。除了更好的组织特征描述外，DECT 还为 SECT 提供了许多优势，例如偶然发现的特征描述和减少辐射和碘对比剂的剂量。
