Chinese Journal of Magnetic Resonance ›› 2015, Vol. 32 ›› Issue (3): 462-469.doi: 10.11938/cjmr20150307

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Optimization of Limited Amplitude Radiofrequency Pulse with Variance Evaluation

ZHANG Shu-lin1,2,3,CHANG Yan1,YANG Xiao-dong1*   

  1. 1. Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences, Suzhou 215163, China; 2. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-08-14 Revised:2015-07-23 Online:2015-09-05 Published:2015-09-05
  • About author:*Corresponding author:YANG Xiao-dong, Tel: +86-0512-69588133, E-mail: xiaodong.yang@sibet.ac.cn
  • Supported by:

    国家自然科学基金资助项目(11105096),中国科学院科研装备研制项目资助(YZ201253),江苏省自然科学基金资助项目(BK20131171),苏州市科技计划资助项目(SH201207)

Abstract:

In the design of optimized radiofrequency excitation pulse with limited amplitude, the variance of the pulse excitation efficiency is taken into account to improve the excitation efficiency. It was shown that this method can significantly reduce the inhomogeneity of broadband excitation. The effects of different weights and pulse amplitude restrictions are also discussed in terms of how to achieve better excitation results.

Key words: optimal pulse, radiofrequency pulse amplitude, optimal control theory, broadband, radiofrequency inhomogeneity

CLC Number: