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Reduced phase encoding in spectroscopic imaging

✍ Scribed by Andrew A. Maudsley; G. B. Matson; J. W. Hugg; M. W. Weiner

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
793 KB
Volume
31
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

The effect of different spatial‐encoding (k‐space) sampling distributions are evaluated for magnetic resonance spectroscopic imaging (MRSI) using Fourier reconstruction. Previously, most MRSI studies have used square or cubic k‐space functions, symmetrically distributed. These studies examine the conventional k‐space distribution with spherical distribution, and 1/2 k‐space acquisition, using computer simulation studies of the MRSI acquisition for three spatial dimensions and experimental results. Results compare the spatial response function, Gibbs ringing effects, and signal contamination for different spatial‐encoding distribution functions. Results indicate that spherical encoding, in comparison with cubic encoding, results in a modest improvement of the re sponse function with approximately equivalent spatial resolution for the same acquisition time. For spin‐echo acquired data, reduced acquisition times can readily be obtained using 1/2 k‐space methods, with a concomitant reduction in signal to noise ratio.

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