글로벌 연구동향
의학물리학
- 2016년 03월호
[IEEE Trans Med Imaging] Metal Artifact Reduction for Polychromatic X-ray CT based on a Beam Hardening Corrector.연세대 / 박형석, 서진근*
- 출처
- IEEE Trans Med Imaging
- 등재일
- 2015 Sep 15
- 저널이슈번호
- [Epub ahead of print]
- 내용
Abstract
This paper proposes a new method to correct beam hardening artifacts caused by the presence of metal in polychromatic X-ray computed tomography (CT) without degrading the intact anatomical images. Metal artifacts due to beam-hardening, which are a consequence of X-ray beam polychromaticity, are becoming an increasingly important issue affecting CT scanning as medical implants become more common in a generally aging population. The associated higher-order beam-hardening factors can be corrected via analysis of the mismatch between measured sinogram data and the ideal forward projectors in CT reconstruction by considering the known geometry of highattenuation objects. Without prior knowledge of the spectrum parameters or energy-dependent attenuation coefficients, the proposed correction allows the background CT image (i.e., the image before its corruption by metal artifacts) to be extracted from the uncorrected CT image. Computer simulations and phantom experiments demonstrate the effectiveness of the proposed method to alleviate beam hardening artifacts.
Author information
Park H, Hwang D, Seo J.
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