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| 适用于多重强峰的脉冲梯度场自动匀场技术 | |
| 引用本文： | 陈长忠,陈忠,程恩,肖芬.适用于多重强峰的脉冲梯度场自动匀场技术[J].厦门大学学报(自然科学版),2000,39(3):317-322. |
| 作者姓名： | 陈长忠 陈忠 程恩 肖芬 |
| 作者单位： | 1. 厦门大学物理学系,福建,厦门,361005 2. 厦门大学物理学系,福建,厦门,361005,厦门大学化学系,福建,厦门,361005 3. 厦门大学电子工程系,福建,厦门,361005 |
| 基金项目： | 国家自然科学基金!重点资助项目(2 9832 0 2 0 )和面上资助项目(196 0 50 0 4 )，福建省自然科学基金资助项目!(C9910 0 0 1) |
| 摘 要： | 提出了一种适用于高分辨率ＮＭＲ的快速，通用且可靠的全自动均方法。利用一个带有预饱和辐照的脉冲梯度场匀场序列来提高具有多重强峰的样品在Ｘ轴方向高阶匀场的质量。通过对Ｚ轴磁场梯度和匀场线圈电流的多项式拟合，以获得磁场不均匀而引起的相位分布。该方法不仅简化了具有多重强峰时匀场最优化过程，而且能够扩展到包括非轴向的三维自动匀场。 |
| 关 键 词： | 核磁共振 脉冲梯度场 自动匀场 多重强峰 |
| 修稿时间： | 1999-09-28 |
Automatic Shimming for Multiple Strong Peaks Using Pulse Field Gradient |
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| CHEN Chang-zhong,CHEN Zhong,CHENG En,XIAO Fen.Automatic Shimming for Multiple Strong Peaks Using Pulse Field Gradient[J].Journal of Xiamen University(Natural Science),2000,39(3):317-322. | |
| Authors: | CHEN Chang-zhong CHEN Zhong CHENG En XIAO Fen |
| Abstract: | A fast,reliable,and versatile method has been developed for fully automatic shimming in high- resolution nuclear magnetic resonance.A shimming pulse sequence combined with a pre- saturation irradiation is proposed for the first time to improve the quality of high- order shimming in the Z direction when a sample has multiple strong peaks. The phase mapping method of a field inhomogeneity based on an Z axis pulse field gradient and polynomial fitting procedures of the axial shimming coil currents were described.This method proposed herein greatly simplifies the shim optimization and is readily to be extended to three dimensions to include off- axis shimming. |
| Keywords: | nuclear magnetic resonance pulsed field gradient automatic shimming multiple strong peaks |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |