Radiol Technol. 2020 Jul;91(6):561CT-576CT.
X-ray spectra consist of high- and low-energy components that interact differently with atomic components of tissues and materials in the human body. Dual-energy computed tomography (CT) uses these differences to produce detailed anatomic and functional images not possible with traditional single-energy CT. Dual-energy CT can digitally subtract materials and tissues from images and enhance iodine contrast without the added image noise typical with low-energy settings. Techniques such as iterative reconstruction with postprocessing algorithms can improve image quality and provide more information without increasing overall radiation dose and can lower dose in some cases.
X 射线光谱由高能和低能成分组成，它们与人体组织和材料的原子成分相互作用方式不同。双能计算机断层扫描（CT）利用这些差异生成传统单能 CT 无法实现的详细解剖和功能图像。双能 CT 可以从图像中数字减去物质和组织，并增强碘对比，而不会增加典型的低能设置的图像噪声。诸如后处理算法迭代重建等技术可以在不增加总辐射剂量的情况下提高图像质量并提供更多信息，在某些情况下还可以降低剂量。
