Gradient shimming based on regularized estimation for B-0-field and shim functions
文献类型：期刊论文
| 作者 | Song, Kan1,2; Bao, Qingjia1; Chen, Fang1; Huang, Chongyang1; Feng, Jiwen1; Liu, Chaoyang1 |
| 刊名 | JOURNAL OF MAGNETIC RESONANCE
 |
| 出版日期 | 2016-07-01 |
| 卷号 | 268页码:1-9 |
| 关键词 | NMR spectrometer Gradient shimming B-0 inhomogeneity Penalized Maximum Likelihood Regularized estimation Field mapping |
| 英文摘要 | Mapping B-0-field and shim functions spatially is a crucial step in the gradient shimming. The conventional estimation method used in the phase difference imaging technique takes no account for noise and T-2* effects, and is prone to create noisy and distorted field maps. This paper describes a new gradient shimming based on the regularized estimation for B-0-field and shim functions. Based on a statistical model, the B-0-field and shim function maps are estimated by a Penalized Maximum Likelihood method that minimizes two regularized least-squares cost functions, respectively. The first cost function of B-0-field exploits the two facts that the noise in the phase difference measurements is Gaussian and the B-0-field maps tend to be smooth. And the other one adds an additional fact that each shim function corresponds to a given spherical harmonic of the magnetic field. Significant improvements in the quality of field mapping and in the final shimming results are demonstrated through computer simulations as well as experiments, especially when the magnetic field homogeneity is poor. (C) 2016 Published by Elsevier Inc. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences ; Technology |
| 类目[WOS] | Biochemical Research Methods ; Physics, Atomic, Molecular & Chemical ; Spectroscopy |
| 研究领域[WOS] | Biochemistry & Molecular Biology ; Physics ; Spectroscopy |
| 关键词[WOS] | FIELD MAP ; IMAGE-RECONSTRUCTION ; MRI |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000378185900001 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/9409]  |
| 专题 | 武汉物理与数学研究所_高技术创新与发展中心 |
| 作者单位 | 1.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom Mol Phys, Wuhan Ctr Magnet Resonance,Key Lab Magnet Resonan, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, Kan,Bao, Qingjia,Chen, Fang,et al. Gradient shimming based on regularized estimation for B-0-field and shim functions[J]. JOURNAL OF MAGNETIC RESONANCE,2016,268:1-9. |
| APA | Song, Kan,Bao, Qingjia,Chen, Fang,Huang, Chongyang,Feng, Jiwen,&Liu, Chaoyang.(2016).Gradient shimming based on regularized estimation for B-0-field and shim functions.JOURNAL OF MAGNETIC RESONANCE,268,1-9. |
| MLA | Song, Kan,et al."Gradient shimming based on regularized estimation for B-0-field and shim functions".JOURNAL OF MAGNETIC RESONANCE 268(2016):1-9. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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