In vivo 1H NMR spectroscopy of the human brain at 9.4 T: initial results.
In vivo 1H NMR spectroscopy of the human brain at 9.4 T: initial results.
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DOI:
10.1016/j.jmr.2010.06.006
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发表时间:
2010-09
期刊:
影响因子:
--
通讯作者:
Henry PG
中科院分区:
文献类型:
--
作者:
Deelchand DK;Van de Moortele PF;Adriany G;Iltis I;Andersen P;Strupp JP;Vaughan JT;Uğurbil K;Henry PG
In vivo proton NMR spectroscopy allows non-invasive detection and quantification of a wide range of biochemical compounds in the brain. Higher field strength is generally considered advantageous for spectroscopy due to increased signal-to-noise and increased spectral dispersion. So far 1H NMR spectra have been reported in the human brain up to 7 Tesla. In this study we show that excellent quality short echo time STEAM and LASER 1H NMR spectra can be measured in the human brain at 9.4 Tesla. The information content of the human brain spectra appears very similar to that measured in the past decade in rodent brains at the same field strength, in spite of broader linewidth in human brain. Compared to lower fields, the T1 relaxation times of metabolites were slightly longer while T2 relaxation values of metabolites were shorter (< 100 ms) at 9.4 Tesla. The linewidth of the total creatine (tCr) resonance at 3.03 ppm increased linearly with magnetic field (1.35 Hz/Tesla from 1.5 T to 9.4 T), with a minimum achievable tCr linewidth of around 12.5 Hz at 9.4 Tesla. At very high-field, B0 microsusceptibility effects are the main contributor to the minimum achievable linewidth.
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