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Spatially resolved two‐dimensional spectroscopy
Author(s) -
Adalsteinsson Elfar,
Spielman Daniel M.
Publication year - 1999
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/(sici)1522-2594(199901)41:1<8::aid-mrm3>3.0.co;2-d
Subject(s) - imaging phantom , pixel , image resolution , voxel , scanner , bandwidth (computing) , spiral (railway) , resolution (logic) , spectroscopy , optics , spectral resolution , spectral line , dimension (graph theory) , physics , nuclear magnetic resonance , computer science , artificial intelligence , mathematics , telecommunications , mathematical analysis , quantum mechanics , astronomy , pure mathematics
A method is presented to collect spatially resolved two‐dimensional spectra on a conventional clinical scanner. Time‐varying gradients during the readout period rapidly sample data simultaneously for two spatial and two spectral dimensions. The k ‐space trajectories are based on spiral paths that make efficient use of the gradient hardware. A gridding algorithm is used for reconstruction. With the spiral‐based readout gradients, current single‐voxel two‐dimensional techniques can be extended to spatially resolved volumetric acquisitions. The method is demonstrated with a two‐dimensional J‐resolved acquisition of a phantom with separate compartments of lactic acid and ethyl alcohol in water. Data were acquired with a spatial resolution of 18 × 18 pixels over a 24 cm field of view, 400 Hz spectral bandwidth in the chemical shift dimension with a 3.8 Hz resolution, and 50 Hz spectral bandwidth in the second frequency dimension with a 1.56 Hz resolution. Magn Reson Med 41:8‐12, 1999. © 1999 Wiley‐Liss, Inc.