Quantitative analysis of the effects of physiologic brain motion on point-resolved spectroscopy.

Document Type

Article

Abstract

BACKGROUND AND PURPOSE: Although single-voxel proton MR spectroscopy is a noninvasive method that enables measurement of brain metabolite concentrations, it has been shown that physiologic brain motion causes inaccuracies in measurement of metabolite concentrations and increases the overall SD of the measurements when the stimulated echo acquisition mode (STEAM) is used. We tested the hypothesis that the point-resolved spectroscopy (PRESS) technique is less sensitive to physiologic brain motion than the STEAM technique.

METHODS: In 10 healthy subjects, spectra were obtained from a voxel located in the left basal ganglia by using the PRESS sequence with cardiac gating and without water suppression to assess global phase change as a function of physiologic brain motion. This was accomplished by acquiring data at various time delays from the R wave throughout the cardiac cycle. Subsequently, spectra were obtained in 10 healthy subjects by using PRESS both without and with cardiac gating, and with water suppression, to determine whether brain motion resulted in a statistically significant difference in mean and SD of measured metabolite concentration.

RESULTS: At various time delays from the R wave throughout the cardiac cycle, no significant global phase difference was noted in water signal intensity. In addition, when PRESS data were obtained both without and with cardiac gating (by using an optimal delay obtained from previously published data by using STEAM), no significant difference was seen in measured metabolite concentrations and SDs.

CONCLUSION: The PRESS technique is relatively insensitive to physiologic brain motion.

Medical Subject Headings

Adult; Brain; Humans; Magnetic Resonance Spectroscopy; Male; Middle Aged; Movement

Publication Date

5-1-2006

Publication Title

AJNR. American journal of neuroradiology

ISSN

0195-6108

Volume

27

Issue

5

First Page

1070

Last Page

1073

PubMed ID

16687544

Digital Object Identifier (DOI)

PMC7975735

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