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Computed tomographic beam-hardening artefacts: mathematical characterization and analysis.

Authors
 Hyoung Suk Park  ;  Yong Eun Chung  ;  Jin Keun Seo 
Citation
 PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol.373(2043) : 20140388, 2015 
Journal Title
 PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES 
ISSN
 1364-503X 
Issue Date
2015
Keywords
Radon transform ; beam-hardening artefacts ; computerized tomography ; wavefront set
Abstract
This paper presents a mathematical characterization and analysis of beam-hardening artefacts in X-ray computed tomography (CT). In the field of dental and medical radiography, metal artefact reduction in CT is becoming increasingly important as artificial prostheses and metallic implants become more widespread in ageing populations. Metal artefacts are mainly caused by the beam-hardening of polychromatic X-ray photon beams, which causes mismatch between the actual sinogram data and the data model being the Radon transform of the unknown attenuation distribution in the CT reconstruction algorithm. We investigate the beam-hardening factor through a mathematical analysis of the discrepancy between the data and the Radon transform of the attenuation distribution at a fixed energy level. Separation of cupping artefacts from beam-hardening artefacts allows causes and effects of streaking artefacts to be analysed. Various computer simulations and experiments are performed to support our mathematical analysis.
Full Text
http://rsta.royalsocietypublishing.org/content/373/2043/20140388.abstract
DOI
10.1098/rsta.2014.0388
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Chung, Yong Eun(정용은) ORCID logo https://orcid.org/0000-0003-0811-9578
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/140066
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