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Proceedings Paper

Iterative image reconstruction for multienergy computed tomography via structure tensor total variation regularization
Author(s): Dong Zeng; Zhaoying Bian; Changfei Gong; Jing Huang; Ji He; Hua Zhang; Lijun Lu; Qianjin Feng; Zhengrong Liang; Jianhua Ma
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Paper Abstract

Multienergy computed tomography (MECT) has the potential to simultaneously offer multiple sets of energy- selective data belonging to specific energy windows. However, because sufficient photon counts are not available in the specific energy windows compared with that in the whole energy window, the MECT images reconstructed by the analytical approach often suffer from poor signal-to-noise (SNR) and strong streak artifacts. To eliminate this drawback, in this work we present a penalized weighted least-squares (PWLS) scheme by incorporating the new concept of structure tensor total variation (STV) regularization to improve the MECT images quality from low-milliampere-seconds (low-mAs) data acquisitions. Henceforth the present scheme is referred to as `PWLS- STV' for simplicity. Specifically, the STV regularization is derived by penalizing the eigenvalues of the structure tensor of every point in the MECT images. Thus it can provide more robust measures of image variation, which can eliminate the patchy artifacts often observed in total variation regularization. Subsequently, an alternating optimization algorithm was adopted to minimize the objective function. Experiments with a digital XCAT phantom clearly demonstrate that the present PWLS-STV algorithm can achieve more gains than the existing TV-based algorithms and the conventional filtered backpeojection (FBP) algorithm in terms of noise-induced artifacts suppression, resolution preservation, and material decomposition assessment.

Paper Details

Date Published: 31 March 2016
PDF: 9 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978349 (31 March 2016); doi: 10.1117/12.2217335
Show Author Affiliations
Dong Zeng, Southern Medical Univ. (China)
Zhaoying Bian, Southern Medical Univ. (China)
Changfei Gong, Southern Medical Univ. (China)
Jing Huang, Southern Medical Univ. (China)
Ji He, Southern Medical Univ. (China)
Hua Zhang, Southern Medical Univ. (China)
Lijun Lu, Southern Medical Univ. (China)
Qianjin Feng, Southern Medical Univ. (China)
Zhengrong Liang, State Univ. of New York (United States)
Jianhua Ma, Southern Medical Univ. (China)

Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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