논문
Technical Note: A model-based sinogram correction for beam hardening artifact reduction in CT
- 저자Sung Min Lee, Jin Keun Seo, Yong Eun Chung, Jongduk Baek, Hyoung Suk Park*
- 학술지Medical Physics 44(9)
- 등재유형
- 게재일자(2017)
Purpose
This study aims to propose a physicsbased method of reducing beamhardening artifacts induced by highattenuation 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 highattenuation materials. This inconsistency formula more accurately represents the inconsistencies of the sinogram than that of a previously reported formula6 (called the MACBC method). This is achieved by considering the properties of the highattenuation materials, which include the materials’ shapes and locations and their effects on the incident Xray spectrum, including their attenuation coefficients.
Results
Numerical simulation and phantom experiment demonstrate that the modeling error of MACBC method are nearly completely red by means of the proposed method.
Conclusion
The proposed method reduces beamhardening artifacts arising from highattenuation materials by relaxing the assumptions of the MACBC method. In doing so, it outperforms the original MACBC method. Further research is required to address other potential sources of metal artifacts, such as photon starvation, scattering, and noise.
Purpose
This study aims to propose a physicsbased method of reducing beamhardening artifacts induced by highattenuation 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 highattenuation materials. This inconsistency formula more accurately represents the inconsistencies of the sinogram than that of a previously reported formula6 (called the MACBC method). This is achieved by considering the properties of the highattenuation materials, which include the materials’ shapes and locations and their effects on the incident Xray spectrum, including their attenuation coefficients.
Results
Numerical simulation and phantom experiment demonstrate that the modeling error of MACBC method are nearly completely red by means of the proposed method.
Conclusion
The proposed method reduces beamhardening artifacts arising from highattenuation materials by relaxing the assumptions of the MACBC method. In doing so, it outperforms the original MACBC method. Further research is required to address other potential sources of metal artifacts, such as photon starvation, scattering, and noise.
