Magnetic Resonance in Medical Sciences
Online ISSN : 1880-2206
Print ISSN : 1347-3182
ISSN-L : 1347-3182
Major Papers
Feasibility of Internally Referenced Brain Temperature Imaging with a Metabolite Signal
Kagayaki KURODANaoyuki TAKEIRobert V. MULKERNKoichi OSHIOToshiharu NAKAITomohisa OKADAAkira MATSUMURAKiyoyuki YANAKAKullervo HYNYNENFerenc A. JOLESZ
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2003 Volume 2 Issue 1 Pages 17-22


The feasibility of using a metabolite signal as an internal reference for self-referenced temperature distribution measurement was examined. Line scan echo-planar spectroscopic imaging (LSEPSI) was applied to obtain quick multi-voxel spectroscopic measurements and to avoid possible spectral degradation from motion. Temperature distribution in a rabbit brain in vivo was successfully visualized by means of the chemical shift of water, which was measured by using naturally abundant (up to 10 mM) N-acetyl-aspartate (NAA) as the reference signal. Unlike the phase-mapping approach, this technique does not require a pixel-by-pixel subtraction. Therefore, in theory, it is more resistant to inter-scan motion or changes in susceptibility. The spatial and temporal resolutions of this technique are 1.5 cm3 and 4.5 min. A higher signal-to-noise ratio and optimization of the water and outer-volume suppression capabilities will be required to further enhance the temperature-mapping capabilities.

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© 2003 by Japanese Society for Magnetic Resonance in Medicine
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