Department of Diagnostic and Interventional Radiology, University Hospital Cologne, Institute for Diagnostic and Interventional Radiology, Cologne, Germany.
Philips Healthcare, R-D CT Innovation, Haifa, Israel.
Diagn Interv Radiol. 2020 Jan;26(1):68-71. doi: 10.5152/dir.2019.19136.
Dual-energy information in computed tomography can be obtained through different technical approaches. Most available scanner designs acquire examination with two different X-ray spectra. Recently, the first detector-based approach became clinically available. Upfront, physical principles of dual-energy CT are reviewed, including the interaction of photons with matter in terms of the Photoelectric effect and Compton scattering. In addition, available concepts to dual energy computed tomography are described. Afterwards, the spectral detector CT system is described in detail. The design of the of the stacked detector design and its inherent technical advantages and disadvantages are discussed. Further, the principles of image reconstruction, their possibilities and limitations are referred. The increase in reconstructions and data pose some challenges to both, clinical and technological workflow which are hereafter addressed. Finally, the detector-based approach is discussed in light of other, emission-based DECT approaches.
计算机断层扫描中的双能量信息可以通过不同的技术途径获得。大多数现有的扫描仪设计通过两种不同的 X 射线光谱进行检查。最近，第一种基于探测器的方法已在临床上应用。首先，回顾双能 CT 的物理原理，包括光子与物质的相互作用，包括光电效应和康普顿散射。此外，还描述了现有的双能计算机断层扫描概念。然后详细描述了光谱探测器 CT 系统。讨论了堆叠探测器设计的设计及其固有的技术优势和劣势。此外，还提到了图像重建的原理、它们的可能性和局限性。重建和数据的增加给临床和技术工作流程都带来了一些挑战，下文将对此进行讨论。最后，根据其他发射式 DECT 方法讨论了基于探测器的方法。
