Iterative image reconstruction for multienergy computed tomography via structure tensor total variation regularization

Dong Zeng; Zhaoying Bian; Changfei Gong; Jing Huang; Ji He; Hua Zhang; Lijun Lu; Qianjin Feng; Zhengrong Liang; Jianhua Ma

doi:10.1117/12.2217335

31 March 2016 Iterative image reconstruction for multienergy computed tomography via structure tensor total variation regularization

Dong Zeng, Zhaoying Bian, Changfei Gong, Jing Huang, Ji He, Hua Zhang, Lijun Lu, Qianjin Feng, Zhengrong Liang, Jianhua Ma

Author Affiliations +

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 978349 (2016) https://doi.org/10.1117/12.2217335
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

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.

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Dong Zeng, Zhaoying Bian, Changfei Gong, Jing Huang, Ji He, Hua Zhang, Lijun Lu, Qianjin Feng, Zhengrong Liang, and Jianhua Ma "Iterative image reconstruction for multienergy computed tomography via structure tensor total variation regularization", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978349 (31 March 2016); https://doi.org/10.1117/12.2217335

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