Conference contribution
(Conference Contribution)


Fast iterative beam hardening correction based on frequency splitting in computed tomography


Publication Details
Author(s): Yang Q, Elter M, Schasiepen I, Maass N, Hornegger J
Publication year: 2013
Volume: 8668
Journal issue: null
Pages range: -
ISSN: 1605-7422
Event: Medical Imaging 2013: Physics of Medical Imaging
Event location: Lake Buena Vista, FL

Abstract

In computed tomography (CT), the nonlinear characteristics of beam hardening are due to the polychromaticity of X-rays, which severely degrade the CT image quality and diagnostic accuracy. The correction of beam hardening has been an active area since the early years of CT, and various techniques have been developed. State of- the-art works on multi-material beam hardening correction (BHC) are mainly based on segmenting datasets into different materials, and correcting the non-linearity iteratively. Those techniques are limited in correction effectiveness due to inaccurate segmentation. Furthermore, most of them are computationally intensive. In this study, we introduce a fast BHC scheme based on frequency splitting with the fact that beam hardening artifacts mainly contain in the low frequency components and take more iterations to be corrected in comparison with high frequency components. After low-pass filtering and correcting artifacts at down-sampled projections, an artifact reduced high resolution reconstruction will be obtained by incorporating the original edge information from the high frequency components. Evaluations in terms of correction accuracy and computational eficiency are performed using simulated and real CT datasets. In comparison to the BHC algorithm without frequency splitting, the proposed accelerated algorithm yields comparable results in correcting cupping and streak artifacts with tremendously reduced computational effort. We conclude that the presented framework can achieve a significant speedup while still obtaining excellent artifact reduction. This is a significant practical advantage for clinical as well as industrial CT. © 2013 SPIE.



How to cite
APA: Yang, Q., Elter, M., Schasiepen, I., Maass, N., & Hornegger, J. (2013). Fast iterative beam hardening correction based on frequency splitting in computed tomography. (pp. -). Lake Buena Vista, FL.

MLA: Yang, Qiao, et al. "Fast iterative beam hardening correction based on frequency splitting in computed tomography." Proceedings of the Medical Imaging 2013: Physics of Medical Imaging, Lake Buena Vista, FL 2013. -.

BibTeX: Download


External Organisations
Share link
Last updated on 2017-09-24 at 02:30
PDF downloaded successfully