TY - GEN
T1 - Spectral CT image restoration using average image induced nonlocal means filter
AU - Zeng, Dong
AU - Ma, Jianhua
AU - Zhang, Hua
AU - Bian, Zhaoying
AU - Niu, Shanzhou
AU - Huang, Jing
AU - Chen, Wufan
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/7/29
Y1 - 2014/7/29
N2 - Spectral computed tomography (CT) with energy-resolved detector has gained considerable interests in recent years due to its remarkable abilities in yielding high energy resolution and material differentiation. However, because of the limited photon counts using narrow energy bin, spectral CT images usually suffer from poor SNR and strong streak artifacts. In this work, to restore each energy-specific image, we propose an average image induced nonlocal means (aviNLM) filter by exploiting redundant information in the whole energy domain. Specifically, the average image is generated by averaging all images reconstructed from each energy domain, which is used to induce each energy-specific image restoration. The numerical simulation studies have shown that the present aviNLM filter for spectral CT image restoration can achieve noticeable gains than direct filtered back-projection image reconstruction in terms of noise-induced artifacts suppression.
AB - Spectral computed tomography (CT) with energy-resolved detector has gained considerable interests in recent years due to its remarkable abilities in yielding high energy resolution and material differentiation. However, because of the limited photon counts using narrow energy bin, spectral CT images usually suffer from poor SNR and strong streak artifacts. In this work, to restore each energy-specific image, we propose an average image induced nonlocal means (aviNLM) filter by exploiting redundant information in the whole energy domain. Specifically, the average image is generated by averaging all images reconstructed from each energy domain, which is used to induce each energy-specific image restoration. The numerical simulation studies have shown that the present aviNLM filter for spectral CT image restoration can achieve noticeable gains than direct filtered back-projection image reconstruction in terms of noise-induced artifacts suppression.
KW - Energy-resolved detector
KW - Image restoration
KW - Nonlocal means
KW - Spectral CT
UR - https://www.scopus.com/pages/publications/84927922589
U2 - 10.1109/isbi.2014.6867917
DO - 10.1109/isbi.2014.6867917
M3 - 会议稿件
AN - SCOPUS:84927922589
T3 - 2014 IEEE 11th International Symposium on Biomedical Imaging, ISBI 2014
SP - 497
EP - 500
BT - 2014 IEEE 11th International Symposium on Biomedical Imaging, ISBI 2014
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 11th IEEE International Symposium on Biomedical Imaging, ISBI 2014
Y2 - 29 April 2014 through 2 May 2014
ER -