Avrin D E, Macovski A, Zatz L E
Invest Radiol. 1978 May-Jun;13(3):217-22. doi: 10.1097/00004424-197805000-00007.
Although computed tomography has demonstrated some promise in the direction of quantative radiology, valuable information related to the varying response of tissues to x-rays of different energy is still not utilized on a routine basis. Advancements in a method proposed by Alvarez and Macovski for decomposing dual-spectra CT projection data into its material-dependent Compton and photo-electric components are described. Results are presented to demonstrate that such a separation can be performed. Reconstructed images of separated Compton and photo-electric data obtained from clinical scans are shown. With the improvements described, the Compton images begin to approach the quality of conventional reconstructions with evidence of improved polychromatic correction. The photo-electric data, while separable, suffers from unacceptable noise level. Analysis of this difficulty is presented, with recommendations for future improvement by careful selection of the effective energy of the low energy spectrum. The encouraging results suggest that this technique warrants continued development and evaluation.
尽管计算机断层扫描在定量放射学方面已展现出一定前景，但与不同能量X射线作用下组织的不同反应相关的有价值信息仍未在常规检查中得到利用。本文描述了阿尔瓦雷斯和马科夫斯基提出的一种方法的进展，该方法可将双谱CT投影数据分解为与物质相关的康普顿和光电成分。展示的结果表明这种分离是可以实现的。呈现了从临床扫描获得的分离后的康普顿和光电数据的重建图像。通过所述改进，康普顿图像开始接近传统重建的质量，有证据表明多色校正得到了改善。光电数据虽然可以分离，但噪声水平过高。文中分析了这一难题，并建议通过精心选择低能谱的有效能量来实现未来的改进。令人鼓舞的结果表明，这项技术值得持续开发和评估。
