波谱学杂志 ›› 2015, Vol. 32 ›› Issue (4): 551-562.doi: 10.11938/cjmr20150401

• 研究论文 • 上一篇    下一篇

迭代软阈值法压缩感知重建谱峰较宽的二维固体谱

韩明月,郑慧,胡炳文*,杨光*   

  1. 华东师范大学 物理系,上海市磁共振重点实验室,上海 200062
  • 收稿日期:2014-11-24 修回日期:2015-10-24 出版日期:2015-12-05 发布日期:2015-12-05
  • 作者简介:韩明月(1988-),女,吉林长春人,硕士研究生,无线电物理专业. *通讯联系人:杨光,电话:021-62233873,E-mail:gyang@phy.ecnu.edu.cn;胡炳文,电话:021-62233633,E-mail:bwhu@phy.ecnu.edu.cn.
  • 基金资助:

    上海市科委资助项目(08DZ1900700)

Compressed Sensing Reconstruction with Iterative Soft Thresholding for Two-Dimensional Solid-State NMR Spectra with Broad Peaks

HAN Ming-yue,ZHENG Hui,HU Bing-wen*,YANG Guang*   

  1. Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China
  • Received:2014-11-24 Revised:2015-10-24 Online:2015-12-05 Published:2015-12-05
  • About author:*Corresponding author:YANG Guang, Tel: +86-21-62233873, E-mail: gyang@phy.ecnu.edu.cn; HU Bing-wen, Tel: +86-21-62233633, E-mail: bwhu@phy.ecnu.edu.cn.
  • Supported by:

    上海市科委资助项目(08DZ1900700)

摘要:

压缩感知技术可以打破传统奈奎斯特采样定理的限制,利用优化算法对欠采数据进行重建,并获得高质量的结果,因此在核磁共振领域得到了广泛的关注.但是当核磁共振谱的谱峰很宽时,基于共轭梯度方法的压缩感知重建却难以得到令人满意的谱图.因此,该文采用凸优化非线性重建算法,使用基于谱图域软阈值的压缩感知算法重建固体二维宽谱(1H双量子-单量子谱或MQMAS谱),有效地解决了宽峰在重建时变弱的问题.

关键词: 压缩感知(Compressed Sensing, CS), 固体核磁共振, 软阈值, 随机欠采, 共轭梯度

Abstract:

Conjugate gradient (CG) method has been used previously to reconstruct double quantum-single quantum (DQ-SQ) spectra. However, satisfactory results can be obtained only when the spectra contain only narrow peaks, but not in the case when broad peaks are present. Compressed sensing technology can break the limit of the Nyquist acquisition theorem and reconstruct under-sampled data with high quality. The technology has been applied in the field of nuclear magnetic resonance (NMR). In this paper, we propose to use compressed sensing with iterative soft thresholding (IST) to reconstruct two-dimensional solid-state NMR spectra with broad peaks, such as the spectra obtained in 1H DQ-SQ and 87Rb multiple quantum-magic angle spinning (MQ-MAS) experiments. It was found that, with the IST method, compressed sensing technology could be used to reconstruct high-quality spectra containing broad peaks from under-sampled datasets.

Key words: compressed sensing, solid-state NMR, iterative soft thresholding, pseudo- random sampling, conjugate gradient

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