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Proceedings Paper

Noise reduction by projection direction dependent diffusion for low dose fan-beam x-ray computed tomography
Author(s): Shaojie Tang; Xuanqin Mou; Yanbo Zhang; Hengyong Yu
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Paper Abstract

We propose a novel method to reduce the noise in fan-beam computed tomography (CT) imaging. First, the inverse Radon transform is induced for a family of differential expression of projection function. Second, the diffusion partial differential equation (PDE) is generalized from image space to projection space in parallel-beam geometry. Third, the diffusion PDE is further induced from parallel-beam geometry to fan-beam geometry. Finally, the projection direction dependent diffusion is developed to reduce CT noise, which arises from the quantum variation in the low dose exposure of a medical x-ray CT (XCT) system. The proposed noise reduction processes projections iteratively and dependently on x-ray path position, followed by a general CT reconstruction. Numerical simulation studies have demonstrated its feasibility in the noise reduction of low dose fan-beam XCT imaging.

Paper Details

Date Published: 16 March 2011
PDF: 11 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79613L (16 March 2011); doi: 10.1117/12.877635
Show Author Affiliations
Shaojie Tang, Xi'an Jiaotong Univ. (China)
Xi'an Univ. of Posts and Telecommunications (China)
Xuanqin Mou, Xi'an Jiaotong Univ. (China)
Yanbo Zhang, Xi'an Jiaotong Univ. (China)
Hengyong Yu, Wake Forest Univ. Health Sciences (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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