A new first order peak location shimming method
10.3321/j.issn:1003-3289.2009.12.040
- VernacularTitle:一种基于峰值定位法的一阶匀场新方法
- Author:
Qun HE
;
Kun ZHOU
;
Shanglian BAO
- Publication Type:Journal Article
- Keywords:
Permanent magnet MRI system;
First-order shimming;
Peak location method
- From:
Chinese Journal of Medical Imaging Technology
2009;25(12):2290-2293
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop a fast shimming method for permanent magnet MRI system. Methods Peak location method (PLM) was improved by calculating the eddy current effect, and the time deviation was replaced by their phase to increase the precision. Results Experiment showed that the new method took less than 45 s, which was 3 times faster than conventional method while providing the same homogeneity. The result of PLM satisfied the requirement of homogeneity. Conclusion This new method can significantly improve the homogeneity in a short time and satisfy further fast pulse sequence development on 0.5T permanent magnet MRI system, which can be generalized for any permanent magnet first order shimming.
