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Fast 1 H spectroscopic imaging using a multi‐element head‐coil array
Author(s) -
Schäffter Tobias,
Börnert Peter,
Leussler Christoph,
Carlsen Ingwer C.,
Leibfritz Dieter
Publication year - 1998
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.1910400204
Subject(s) - electromagnetic coil , nuclear magnetic resonance , sensitivity (control systems) , signal (programming language) , signal to noise ratio (imaging) , pulse sequence , pulse (music) , creatine , magnetic resonance spectroscopic imaging , noise (video) , phosphocreatine , magnetic resonance imaging , physics , optics , chemistry , computer science , electronic engineering , detector , artificial intelligence , medicine , energy metabolism , biochemistry , quantum mechanics , engineering , image (mathematics) , radiology , programming language
Fast proton magnetic resonance spectroscopic imaging (MRSI) using a multi‐element head‐coil array is examined with respect to three aspects: the coil design, the use of an appropriate signal combination method, and the design of the MRSl pulse sequence itself. An eight‐element head‐coil array has been developed to increase the signal‐to‐noise ratio (SNR) of MRSl in the human brain. The flexible wraparound design optimally fits different head sizes and thus provides high sensitivity. The signal combination of the individual coil elements is based on the approach proposed by Roemer et al. Magn. Reson. Med . 16, 192 (1990). An additional short prescan is performed to provide a good estimate of the complex coil sensitivity profiles, which are used in the signal combination procedure to correct the spectroscopic imaging data for the spatially varying intensity. The use of coil arrays in MRSI has some effect on the requirements for both water and lipid suppression. These techniques and a MRSl pulse sequence that provides a high spectroscopic resolution are described and discussed. Experimental results at 1.5 T show that metabolite maps of N‐acetylaspartate (NAA), choline (Cho), phosphocreatine (PCr)/creatine (Cr) can be obtained within a 5‐min acquisition time.