Phase contrast imaging with polycapillary optics

Hassan Abbas; Tianxi Sun; C. A. MacDonald

doi:10.1117/12.946119

19 October 2012 Phase contrast imaging with polycapillary optics

Hassan Abbas, Tianxi Sun, C. A. MacDonald

Proceedings Volume 8509, Penetrating Radiation Systems and Applications XIII; 85090A (2012) https://doi.org/10.1117/12.946119
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Conventional diagnostic radiography is limited by the similarity between x-ray absorption coefficients of normal tissue and carcinoma, which results in poor inherent subject contrast. Differences in x-ray refractive indices are much larger, so phase imaging has the potential for higher contrast. Unfortunately, the spatial coherence necessary for simple in-line phase contrast requires small sources at large distances, and hence excessive exposure times. Other schemes such as grating techniques require multiple images and complex alignment. In this work, polycapillary optics were employed to increase the intensity of the x-ray beam for simple propagation in-line imaging. Focusing through pinhole apertures created a small virtual source of high intensity from which phase contrast edge effects were observed with tissueequivalent phantoms.

Citation Download Citation

Hassan Abbas, Tianxi Sun, and C. A. MacDonald "Phase contrast imaging with polycapillary optics", Proc. SPIE 8509, Penetrating Radiation Systems and Applications XIII, 85090A (19 October 2012); https://doi.org/10.1117/12.946119

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