波谱学杂志 ›› 1998, Vol. 15 ›› Issue (6): 527-531.

• 研究论文 • 上一篇    下一篇

结合脉冲梯度场(PFG)的选择性形状脉冲的相位特性研究

郑绍宽1, 林东海2, 廖新丽2, 林国兴2, 吴钦义2   

  1. 1. 厦门大学物理系, 厦门 361005;
    2. 厦门大学化学系, 厦门 361005
  • 收稿日期:1998-06-08 修回日期:1998-09-07 出版日期:1998-12-05 发布日期:2018-01-17
  • 作者简介:郑绍宽,男,32岁,硕士,讲师,在职博士
  • 基金资助:
    福建省自然科学基金资助项目

A STUDY OF PHASE PROPERTY OF SELECTIVE SHAPED PULSESIN COMBINATION WITH PFG

Zheng Shaokuan1, Lin Donghai2, Liao Xinli2, Lin Guoxing2, Wu Qinyi2   

  1. 1. Dept. of Phys. Xiamen University, Xiamen 361005;
    2. Dept. of Chem. Xiamen University, Xiamen 361005
  • Received:1998-06-08 Revised:1998-09-07 Online:1998-12-05 Published:2018-01-17

摘要: 从转动矩阵理论与实验两方面研究了结合脉冲梯度场的选择性形状脉冲的相位特性,结果表明:单梯度自旋回波(SPFGSE)和双梯度自旋回波(DPFGSE)对于对称和反对称的形状脉冲,都能很好地克服其相位畸变;而双梯度自旋回波(DPFGSE)对于非对称的形状脉冲也能克服其相位畸变;双选择性单梯度自旋回波无法克服形状脉冲的相位畸变.

关键词: NMR, 脉冲梯度场(PFG), 形状脉冲(shaped pulse), 相位特性(phase property)

Abstract: The phase properties of selective pulses in combination with PFG has been studied theoretically and experimentally.The results show that:for symmetric and antisymmetric shaped pulses, by using selective single PFG spin-echo(SPFGSE) and selective double PFG spin-echo (DPFGSE), pure in-phase magnetization can be obtained in their whole excitation bandwidth.However, for other shaped pulses, the magnetization without phase distortions can only be obtained by using DPFGSE.Moreover, using doubly-selective SPFGSE, neither symmetric (orantisy mmetric) nor non-symmetric shaped pulses can provide pure in-phase magnetization.

Key words: NMR, PFG, Shaped pulse, Phase property