A new gradient shimming method based on undistorted field map of B-0 inhomogeneity

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 高技术创新与发展中心

	A new gradient shimming method based on undistorted field map of B-0 inhomogeneity
	Bao, Qingjia 1; Chen, Fang 1; Chen, Li 1; Song, Kan 1,2; Liu, Zao 1,2; Liu, Chaoyang 1
刊名	JOURNAL OF MAGNETIC RESONANCE
	2016-04-01
卷号	265 页码:25-32
关键词	NMR spectrometer Automatic shimming Gradient shimming High resolution spectra B-0 inhomogeneity Field mapping
英文摘要	Most existing gradient shimming methods for NMR spectrometers estimate field maps that resolve B-0 inhomogeneity spatially from dual gradient-echo (GRE) images acquired at different echo times. However, the distortions induced by B-0 inhomogeneity that always exists in the GRE images can result in estimated field maps that are distorted in both geometry and intensity, leading to inaccurate shimming. This work proposes a new gradient shimming method based on undistorted field map of B-0 inhomogeneity obtained by a more accurate field map estimation technique. Compared to the traditional field map estimation method, this new method exploits both the positive and negative polarities of the frequency encoded gradients to eliminate the distortions caused by B-0 inhomogeneity in the field map. Next, the corresponding automatic post-data procedure is introduced to obtain undistorted B-0 field map based on knowledge of the invariant characteristics of the B-0 inhomogeneity and the variant polarity of the encoded gradient. The experimental results on both simulated and real gradient shimming tests demonstrate the high performance of this new method. (C) 2015 Elsevier Inc. All rights reserved.
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]	NORMAL SPECTROMETER HARDWARE ; IN-VIVO ; PHASE ; RECONSTRUCTION ; OPTIMIZATION ; ACQUISITION ; HOMOGENEITY ; IMAGES
收录类别	SCI
语种	英语
WOS记录号	WOS:000374513600004
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/9351]
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, State Key Lab Magnet Resonance & Atom Mol Phys, Key Lab Magnet Resonance Biol Syst, Wuhan Ctr Magnet Resonance,Wuhan Inst Phys & Math, Wuhan 430071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Bao, Qingjia,Chen, Fang,Chen, Li,et al. A new gradient shimming method based on undistorted field map of B-0 inhomogeneity[J]. JOURNAL OF MAGNETIC RESONANCE,2016,265:25-32.
APA	Bao, Qingjia,Chen, Fang,Chen, Li,Song, Kan,Liu, Zao,&Liu, Chaoyang.(2016).A new gradient shimming method based on undistorted field map of B-0 inhomogeneity.JOURNAL OF MAGNETIC RESONANCE,265,25-32.
MLA	Bao, Qingjia,et al."A new gradient shimming method based on undistorted field map of B-0 inhomogeneity".JOURNAL OF MAGNETIC RESONANCE 265(2016):25-32.