Suppression of metal artifact in computed tomography by reweighted total variation reconstruction

LI Ming; ZHENG Jian; ZHANG Cheng; ZHOU Zhe; ZHANG Tao

doi:10.3788/OPE.20152306.1714

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Suppression of metal artifact in computed tomography by reweighted total variation reconstruction

更新时间：2020-08-13

- Suppression of metal artifact in computed tomography by reweighted total variation reconstruction
- Optics and Precision Engineering Vol. 23, Issue 6, Pages: 1714-1721(2015)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
  3. 中国科学院苏州生物医学工程技术研究所,江苏苏州,中国,215163
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152306.1714
  CLC： R814.42;TP391.4
- Received：04 August 2014，
  
  Revised：30 September 2014，
  
  Published：25 June 2015
- 稿件说明：
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李铭, 郑健, 章程等. 应用变权全变分重建抑制CT金属伪影[J]. 光学精密工程, 2015,23(6): 1714-1721

LI Ming, ZHENG Jian, ZHANG Cheng etc. Suppression of metal artifact in computed tomography by reweighted total variation reconstruction[J]. Editorial Office of Optics and Precision Engineering, 2015,23(6): 1714-1721
李铭, 郑健, 章程等. 应用变权全变分重建抑制CT金属伪影[J]. 光学精密工程, 2015,23(6): 1714-1721 DOI： 10.3788/OPE.20152306.1714.

LI Ming, ZHENG Jian, ZHANG Cheng etc. Suppression of metal artifact in computed tomography by reweighted total variation reconstruction[J]. Editorial Office of Optics and Precision Engineering, 2015,23(6): 1714-1721 DOI： 10.3788/OPE.20152306.1714.

摘要

提出一种基于变权全变分(RWTV )迭代重建的金属伪影校正算法以抑制CT系统重建图像中出现的金属伪影.该算法应用自定义的权值函数对全变分模型做加权惩罚

生成权值全变分模型;通过交替解权值全变分最小化过程和更新权值步骤实现变权全变分重建算法.应用该算法对数值模型和临床图像前向投影生成的投影数据分别进行了重建实验.数值模型实验结果表明:在60个采样角度下

用提出算法重建的图像具有最高的空间分辨率特性;且信噪比值较平滑插值金属伪影校正算法、全变分约束最优化算法的重建结果分别高出17.523 6和 7.145 2 dB.临床数据实验结果表明:该算法重建结果有效抑制了CT金属伪影

清晰重建出颅骨内的细节解剖结构

极大提高了重建图像的质量.

Abstract

A novel metal artifact reduction algorithm based on a Reweighted Total Variation (RWTV) reconstruction was proposed to suppress the metal artifacts in Computed Tomography (CT) images to improve the image quality. A user-defined weight function was used as penalty weight to generate the weighted Total Variation(TV) model. The reweighted TV reconstruction algorithm was implemented through solving alternately the weighted TV minimization problem and updating the weight procedure. Then

the algorithm was used in the reconstruction experiments for projections from forward projecting phantom and clinical data respectively. The digital phantom experiments show that the proposed algorithm has the topmost spatial resolution of reconstructed images in 60 sampling angles. Furthermore

the signal-to-noise ratios of images through the proposed algorithm are 17.523 6

7.145 2 dB higher than those of images reconstructed by Smooth Interpolation Metal Artifact Reduction (SI-MAR) algorithm and TV minimization based on Constrained Optimization-Penalized Smoothness (CO-PS) algorithm respectively. Clinical experimental results demonstrate that the proposed algorithm successfully suppresses the metal artifacts and clearly restores the anatomical structure in the skull. Moreover

the quality of reconstructed images has been greatly improved by the proposed metal artifact suppression algorithm.

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Keywords

references

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