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Technical Note: A model-based sinogram correction for beam hardening artifact reduction in CT

Authors
 Sung Min Lee  ;  Jin Keun Seo  ;  Yong Eun Chung  ;  Jong duk Baek  ;  Hyoung Suk Park 
Citation
 Medical Physics, Vol.44(9) : e147-e152, 2017 
Journal Title
 Medical Physics 
ISSN
 0094-2405 
Issue Date
2017
Keywords
beam hardening artifacts ; computerized tomography ; metal artifact reduction
Abstract
PURPOSE: This study aims to propose a physics-based method of reducing beam-hardening artifacts induced by high-attenuation materials such as metal stents or other metallic implants. METHODS: The proposed approach consists of deriving a sinogram inconsistency formula representing the energy dependence of the attenuation coefficient of high-attenuation materials. This inconsistency formula more accurately represents the inconsistencies of the sinogram than that of a previously reported formula (called the MAC-BC method). This is achieved by considering the properties of the high-attenuation materials, which include the materials' shapes and locations and their effects on the incident X-ray spectrum, including their attenuation coefficients. RESULTS: Numerical simulation and phantom experiment demonstrate that the modeling error of MAC-BC method are nearly completely removed by means of the proposed method. CONCLUSION: The proposed method reduces beam-hardening artifacts arising from high-attenuation materials by relaxing the assumptions of the MAC-BC method. In doing so, it outperforms the original MAC-BC method. Further research is required to address other potential sources of metal artifacts, such as photon starvation, scattering, and noise.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/160923
DOI
10.1002/mp.12218
Appears in Collections:
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실)
Yonsei Authors
정용은(Chung, Yong Eun)
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Full Text
https://aapm.onlinelibrary.wiley.com/doi/full/10.1002/mp.12218
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