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Out‐and‐in spiral spectroscopic imaging in rat brain at 7 T
Author(s) -
Hiba Bassem,
Faure Bérengère,
Lamalle Laurent,
Décorps Michel,
Ziegler Anne
Publication year - 2003
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10622
Subject(s) - spiral (railway) , physics , nuclear magnetic resonance , voxel , image resolution , bandwidth (computing) , signal (programming language) , encoding (memory) , temporal resolution , resolution (logic) , nuclear medicine , optics , computer science , mathematics , medicine , mathematical analysis , artificial intelligence , programming language , computer network
Abstract With standard spectroscopic imaging, high spatial resolution is achieved at the price of a large number of phase‐encoding steps, leading to long acquisition times. Fast spatial encoding methods reduce the minimum total acquisition time. In this article, a k ‐space scanning scheme using a continuous series of growing and shrinking, or “out‐and‐in,” spiral trajectories is implemented and the feasibility of spiral spectroscopic imaging for animal models at high B 0 field is demonstrated. This method was applied to rat brain at 7 T. With a voxel size of about 8.7 μl (as calculated from the point‐spread function), a 30 × 30 matrix, and a spectral bandwidth of 11 kHz, the minimum scan time was 9 min 20 sec for a signal‐to‐noise ratio of 7.1 measured on the N‐acetylaspartate peak. Magn Reson Med 50:1127–1133, 2003. © 2003 Wiley‐Liss, Inc.