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In vivo proton spectroscopy in presence of eddy currents

✍ Scribed by Uwe Klose

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
240 KB
Volume
14
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

Spatially localized methods in spectroscopy often operate with magnetic field gradients for volume selection. The eddy currents induced by these gradients produce time‐dependent shifts of the resonance frequency in the selected volume, which results in a distortion of the spectrum after Fourier transformation. In whole‐body systems the complete compensation of eddy currents is a difficult procedure. To avoid this, a correction method is proposed for proton spectroscopy, which uses the signal of prominent water protons as a reference for the water‐suppressed signal. The correction is performed in the time domain, dividing the water‐suppressed signal by the phase factor of the water signal for each data point. The corrected spectra have a good resolution as shown by phantom measurements and brain and muscle spectra of volunteers. © 1990 Academic Press, Inc.

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