A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance
In conventional computed tomography (CT) systems, X-ray beams used for imaging are polyenergetic. These beams cause hardening artifacts in the reconstructed images owing to their polychromatic nature. For a multi-material imaging object, prior information about the X-ray spectrum and composition of...
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| Format: | Article |
| Language: | English |
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Editorial Office of Computerized Tomography Theory and Application
2025-07-01
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| Series: | CT Lilun yu yingyong yanjiu |
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| Online Access: | https://www.cttacn.org.cn/cn/article/doi/10.15953/j.ctta.2025.064 |
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| author | Yuxin LIU Jiaotong WEI Xiaojie ZHAO Ping CHEN Jinxiao PAN |
| author_facet | Yuxin LIU Jiaotong WEI Xiaojie ZHAO Ping CHEN Jinxiao PAN |
| author_sort | Yuxin LIU |
| collection | DOAJ |
| description | In conventional computed tomography (CT) systems, X-ray beams used for imaging are polyenergetic. These beams cause hardening artifacts in the reconstructed images owing to their polychromatic nature. For a multi-material imaging object, prior information about the X-ray spectrum and composition of the imaging object is required for correcting the beam hardening. To avoid relying on such prior information, this study proposes a beam-hardening artifact correction method for CT imaging of multi-material objects under single voltage. In this method, the X-ray image is considered as a non-negative weighted sum of multiple single-energy X-ray images. The decomposition model for the X-ray transmission images is constructed using the maximum likelihood function of a Gaussian distribution as the objective function under the constraint of the projection integral invariance at different angles. To solve this model, the projection of the spatial terms on the X-ray path is obtained. Thus, CT images for X-ray beams with different energies can be reconstructed. For imaging experiments with dual-material and multi-material models, compared with directly reconstructed CT images, the hardening artifacts in the reconstructed images were significantly reduced using this method, indicating its effectiveness. |
| format | Article |
| id | doaj-art-2593e2f3134e4765bf809ce90ecf13b8 |
| institution | Kabale University |
| issn | 1004-4140 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Editorial Office of Computerized Tomography Theory and Application |
| record_format | Article |
| series | CT Lilun yu yingyong yanjiu |
| spelling | doaj-art-2593e2f3134e4765bf809ce90ecf13b82025-08-20T03:49:46ZengEditorial Office of Computerized Tomography Theory and ApplicationCT Lilun yu yingyong yanjiu1004-41402025-07-0134457157910.15953/j.ctta.2025.0642025-064A Correction Method for Hardening Artifacts in CT Images Based on Integral InvarianceYuxin LIUJiaotong WEIXiaojie ZHAOPing CHENJinxiao PANIn conventional computed tomography (CT) systems, X-ray beams used for imaging are polyenergetic. These beams cause hardening artifacts in the reconstructed images owing to their polychromatic nature. For a multi-material imaging object, prior information about the X-ray spectrum and composition of the imaging object is required for correcting the beam hardening. To avoid relying on such prior information, this study proposes a beam-hardening artifact correction method for CT imaging of multi-material objects under single voltage. In this method, the X-ray image is considered as a non-negative weighted sum of multiple single-energy X-ray images. The decomposition model for the X-ray transmission images is constructed using the maximum likelihood function of a Gaussian distribution as the objective function under the constraint of the projection integral invariance at different angles. To solve this model, the projection of the spatial terms on the X-ray path is obtained. Thus, CT images for X-ray beams with different energies can be reconstructed. For imaging experiments with dual-material and multi-material models, compared with directly reconstructed CT images, the hardening artifacts in the reconstructed images were significantly reduced using this method, indicating its effectiveness.https://www.cttacn.org.cn/cn/article/doi/10.15953/j.ctta.2025.064single voltageintegral invariancebeam hardening correctionwithout prior informationmulti-materials |
| spellingShingle | Yuxin LIU Jiaotong WEI Xiaojie ZHAO Ping CHEN Jinxiao PAN A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance CT Lilun yu yingyong yanjiu single voltage integral invariance beam hardening correction without prior information multi-materials |
| title | A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance |
| title_full | A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance |
| title_fullStr | A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance |
| title_full_unstemmed | A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance |
| title_short | A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance |
| title_sort | correction method for hardening artifacts in ct images based on integral invariance |
| topic | single voltage integral invariance beam hardening correction without prior information multi-materials |
| url | https://www.cttacn.org.cn/cn/article/doi/10.15953/j.ctta.2025.064 |
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