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Proceedings Paper

X-ray tube-based phase CT: spectrum polychromatics and imaging performance
Author(s): Xiangyang Tang; Yi Yang; Shaojie Tang
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Paper Abstract

Owing to its advantages in differentiating low-atomic materials over the conventional attenuation-based CT, the x-ray refraction-based phase contrast CT implemented with grating interferometer (namely grating-based differential phase contrast CT) has drawn increasing attention recently. Through the Talbot-effect, the phase variation of an object is retrieved and reconstructed to characterize the object's refraction property. The Talbot-effect is wavelength dependent, and a quantitative investigation into the influence of x-ray source spectrum polychromatics on the imaging performance of the grating-based differential phase contrast CT can provide guidelines on its architecture design and performance optimization. In this work, we conduct a computer simulation study of the x-ray grating-based differential phase contrast CT imaging under the condition of both monochromatic and polychromatic x-ray sources. The preliminary data shows that, the modulation transfer function (MTF) of a grating-based differential phase contrast CT with polychromatic source changes little in comparison to that with a monochromatic one. Furthermore, it is shown that the spectrum polychromatics leads to a remarkable improvement in the contrast-to-noise ratio of a grating-based differential phase contrast CT, which implies that a commercially available x-ray tube can be well suited to build a differential phase contrast CT with a grating-based interferometer to image the refractive property of an object.

Paper Details

Date Published: 17 March 2011
PDF: 9 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79614Y (17 March 2011); doi: 10.1117/12.878211
Show Author Affiliations
Xiangyang Tang, Emory Univ. School of Medicine (United States)
Yi Yang, Emory Univ. School of Medicine (United States)
Shaojie Tang, Emory Univ. School of Medicine (United States)


Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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