波谱学杂志 ›› 2015, Vol. 32 ›› Issue (4): 596-605.doi: 10.11938/cjmr20150405

• 研究论文 • 上一篇    下一篇

人脑 GABA-MRS 中回顾性运动校正方法研究

张竹伟1,陈录广2,裴孟超3,李建奇1*   

  1. 1. 华东师范大学 物理系,上海市磁共振重点实验室,上海 200062
    2. 第二军医大学 附属长海医院放射科,上海 200433
    3. 上海卡勒幅磁共振技术有限公司,上海 201614
  • 收稿日期:2014-12-02 修回日期:2015-10-23 出版日期:2015-12-05 发布日期:2015-12-05
  • 作者简介:张竹伟(1990-),女,河南人,硕士研究生,无线电物理. *通讯联系人:李建奇,电话: 021-62223871,E-mail: jqli@phy.ecnu.edu.cn.
  • 基金资助:

    国家自然科学基金资助项目(81271533)

Retrospective Motion Correction in GABA-Editing Magnetic Resonance Spectroscopy Using the Residual Water Signals

ZHANG Zhu-wei1CHEN Lu-guang2PEI Meng-chao3LI Jian-qi1*   

  1. 1. Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China
    2. Department of Radiology, Changhai Hospital of Shanghai, The Second Military Medical University, Shanghai 200433, China.
    3. Shanghai Colorful Magnetic Resonance Co. Ltd., Shanghai 201614, China

  • Received:2014-12-02 Revised:2015-10-23 Online:2015-12-05 Published:2015-12-05
  • About author:*Corresponding author: LI Jian-qi, Tel: +86-21-62223871, E-mail: jqli@phy.ecnu.edu.cn.
  • Supported by:

    国家自然科学基金资助项目(81271533)

摘要:

运动会影响? -氨基丁酸(GABA)磁共振谱图质量,因此,数据采集后应对是否运动加以辨别并对运动的波谱数据作相应处理.该文报道了 GABA 磁共振活体波谱测量中回顾性运动校正后处理方法.该后处理方法通过残余水峰来判断被试扫描过程中的头部运动,重建时舍弃受运动影响的数据,从而改善最终得到的编辑谱的质量.同时该文将这种运动校正方法集成到 MEGA-PRESS 序列的重建模块中,使得扫描完成后能直接得到运动校正后的编辑谱,并可采用 LCModel 对编辑谱进行定量分析.研究结果表明,这种方法可以有效去除受运动影响的数据,使得最终得到的谱图质量明显改善,从而为医学诊断和研究提供便利.

关键词: γ-氨基丁酸(GABA), 磁共振波谱, 运动校正

Abstract:

Motions occurring during in vivo magnetic resonance spectroscopy acquisition limit the quality of the spectra and their diagnostic value. Subtraction-based spectral editing techniques, such as J-difference editing, are especially prone to motion artifacts, causing false peaks or incomplete elimination of the background. In this study, a retrospective motion correction post-processing method was introduced to analyze GABA-edited spectra acquired by a MEGA point-resolved spectroscopy (MEGA-PRESS) sequence. Head motion during each acquisition was detected and recorded by the residual water signal; the motion-corrupted data were identified and excluded prior to averaging. The gain in spectral quality by using the proposed method was analyzed using the LCModel program. The results showed that the proposed method is an effective way to discard acquisitions corrupted by motion, and to improve spectral quality.

Key words: magnetic resonance spectroscopy, motion correction, GABA

中图分类号: