政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/65803

English | 正體中文 | 简体中文 | Post-Print筆數 : 27 | Items with full text/Total items : 113303/144284 (79%)
Visitors : 50799767 Online Users : 805

RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.

Home ‧ Login ‧ Upload ‧ Help ‧ About ‧ Administer

政大機構典藏 > 理學院 > 應用物理研究所 > 期刊論文 > Item 140.119/65803

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/65803

Title:	Accelerated Short-TE 3D Proton-Echo-Planar-Spectroscopic-Imaging using 2D-SENSE with a 32-Channel Array Coil
Authors:	蔡尚岳 Tsai, Shang-Yueh
Contributors:	應物所
Keywords:	echo-planar spectroscopic imaging;parallel imaging;SENSE;regularization;large array coil
Date:	2007.12
Issue Date:	2014-05-01 17:47:42 (UTC+8)
Abstract:	MR spectroscopic imaging (MRSI) with whole brain coverage in clinically feasible acquisition times still remains a major challenge. A combination of MRSI with parallel imaging has shown promise to reduce the long encoding times and 2D acceleration with a large array coil is expected to provide high acceleration capability. In this work a very high-speed method for 3D-MRSI based on the combination of proton echo planar spectroscopic imaging (PEPSI) with regularized 2D-SENSE reconstruction is developed. Regularization was performed by constraining the singular value decomposition of the encoding matrix to reduce the effect of low-value and overlapped coil sensitivities. The effects of spectral heterogeneity and discontinuities in coil sensitivity across the spectroscopic voxels were minimized by unaliasing the point spread function. As a result the contamination from extracranial lipids was reduced 1.6-fold on average compared to standard SENSE. We show that the acquisition of short-TE (15 ms) 3D-PEPSI at 3 T with a 32 × 32 × 8 spatial matrix using a 32-channel array coil can be accelerated 8-fold (R = 4 × 2) along y-z to achieve a minimum acquisition time of 1 min. Maps of the concentrations of N-acetyl-aspartate, creatine, choline, and glutamate were obtained with moderate reduction in spatial-spectral quality. The short acquisition time makes the method suitable for volumetric metabolite mapping in clinical studies. Magn Reson Med, 2007. © 2007 Wiley-Liss, Inc.
Relation:	Magn Reson Med, 58(6), 1107-1116
Data Type:	article
Appears in Collections:	[應用物理研究所 ] 期刊論文

Files in This Item:

File	Description	Size	Format
21426.pdf		795Kb	Adobe PDF2	1625	View/Open

社群 sharing

著作權政策宣告 Copyright Announcement

1.本網站之數位內容為國立政治大學所收錄之機構典藏，無償提供學術研究與公眾教育等公益性使用，惟仍請適度，合理使用本網站之內容，以尊重著作權人之權益。商業上之利用，則請先取得著作權人之授權。
The digital content of this website is part of National Chengchi University Institutional Repository. It provides free access to academic research and public education for non-commercial use. Please utilize it in a proper and reasonable manner and respect the rights of copyright owners. For commercial use, please obtain authorization from the copyright owner in advance.

2.本網站之製作，已盡力防止侵害著作權人之權益，如仍發現本網站之數位內容有侵害著作權人權益情事者，請權利人通知本網站維護人員(nccur@nccu.edu.tw)，維護人員將立即採取移除該數位著作等補救措施。
NCCU Institutional Repository is made to protect the interests of copyright owners. If you believe that any material on the website infringes copyright, please contact our staff(nccur@nccu.edu.tw). We will remove the work from the repository and investigate your claim.

Loading...