X-ray tube-based phase CT: spectrum polychromatics and imaging performance

Xiangyang Tang; Yi Yang; Shaojie Tang

doi:10.1117/12.878211

16 March 2011 X-ray tube-based phase CT: spectrum polychromatics and imaging performance

Xiangyang Tang, Yi Yang, Shaojie Tang

Proceedings Volume 7961, Medical Imaging 2011: Physics of Medical Imaging; 79614Y (2011) https://doi.org/10.1117/12.878211
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

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.

Citation Download Citation

Xiangyang Tang, Yi Yang, and Shaojie Tang "X-ray tube-based phase CT: spectrum polychromatics and imaging performance", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79614Y (16 March 2011); https://doi.org/10.1117/12.878211

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