Phase contrast imaging with polycapillary optics

摘要

Conventional diagnostic radiography is limited by the similarity between x-ray absorption coefficients of normal tissueand carcinoma, which results in poor inherent subject contrast. Differences in x-ray refractive indices are much larger, sophase imaging has the potential for higher contrast. Unfortunately, the spatial coherence necessary for simple in-linephase contrast requires small sources at large distances, and hence excessive exposure times. Other schemes such asgrating techniques require multiple images and complex alignment. In this work, polycapillary optics were employed toincrease the intensity of the x-ray beam for simple propagation in-line imaging. Focusing through pinhole aperturescreated a small virtual source of high intensity from which phase contrast edge effects were observed with tissueequivalentphantoms.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.