Donnelly Edwin F, Price Ronald R, Lewis Kenneth G, Pickens David R
Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA.
Med Phys. 2007 Aug;34(8):3165-8. doi: 10.1118/1.2750967.
Polychromatic phase-contrast radiography differs from traditional (absorption-only) radiography in that the method requires at least a partially coherent x-ray source and the resulting images contain information about the phase shifts of x-rays in addition to the traditional absorption information. In a typical embodiment, this effect results in a measurable enhancement in image contrast at the edges of objects. In this study, a phase-contrast imaging system was adapted to allow an object to be imaged at multiple projections, and these projections were used to generate phase-contrast computed tomography images. The images obtained with this technique show edge enhancements surrounding the objects within the image.
多色相衬X射线摄影与传统（仅吸收）X射线摄影不同，因为该方法至少需要一个部分相干的X射线源，并且所得到的图像除了包含传统的吸收信息外，还包含有关X射线相移的信息。在典型的实施方式中，这种效应导致物体边缘处的图像对比度有可测量的增强。在本研究中，对一个相衬成像系统进行了改装，以便能够在多个投影角度对物体进行成像，并且这些投影用于生成相衬计算机断层扫描图像。用该技术获得的图像显示出图像内物体周围的边缘增强。
