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Optical Engineering

Data consistency condition-based beam-hardening correction
Author(s): Shaojie Tang; Xuanqin Mou; Qiong Xu; Yanbo Zhang; James Bennett; Hengyong Yu
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Paper Abstract

In medical x ray computed tomography (CT) imaging devices, the x ray tube usually emits a polychromatic spectrum of photons resulting in beam-hardening artifacts in the reconstructed images. The bone-correction method has been widely adopted to compensate for beam-hardening artifacts. However, its correction performance is highly dependent on the empirical determination of a scaling factor, which is used to adjust the ratio of the reconstructed value in the bone region to the actual mass density of bone-tissue. A significant problem with bone-correction is that a large number of physical experiments are routinely required to accurately calibrate the scaling factor. In this article, an improved bone-correction method is proposed, based on the projection data consistency condition, to automatically determine the scaling factor. Extensive numerical simulations have verified the existence of an optimal scaling factor, the sensitivity of bone-correction to the scaling factor, and the efficiency of the proposed method for the beam-hardening correction.

Paper Details

Date Published: 1 July 2011
PDF: 14 pages
Opt. Eng. 50(7) 076501 doi: 10.1117/1.3599869
Published in: Optical Engineering Volume 50, Issue 7
Show Author Affiliations
Shaojie Tang, Xi'an Univ. of Posts and Telecommunications (China)
Xuanqin Mou, Xi'an Jiaotong Univ. (China)
Qiong Xu, Xi'an Jiaotong Univ. (China)
Yanbo Zhang, Xi'an Jiaotong Univ. (China)
James Bennett, Virginia Polytechnic Institute and State Univ. (United States)
Hengyong Yu, Wake Forest Univ. (United States)

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