Magnetization exchange with water and T1 relaxation of the downfield resonances in human brain spectra at 3.0 T
Abstract
The use of water suppression for in vivo proton MR spectroscopy diminishes the signal intensities from resonances that undergo magnetization exchange with water, particularly those downfield of water. To investigate these exchangeable resonances, an inversion transfer experiment was performed using the metabolite cycling technique for non-water-suppressed MR spectroscopy from a large brain voxel in 11 healthy volunteers at 3.0 T. The exchange rates of the most prominent peaks downfield of water were found to range from 0.5 to 8.9 s−1, while the T1 relaxation times in absence of exchange were found to range from 175 to 525 ms. These findings may help toward the assignments of the downfield resonances and a better understanding of the sources of contrast in chemical exchange saturation transfer imaging. Magn Reson Med, 2011. Show more
Publication status
publishedExternal links
Journal / series
Magnetic Resonance in MedicineVolume
Pages / Article No.
Publisher
Wiley-BlackwellSubject
Proton MR spectroscopy; Brain; Exchangeable protons; Non-water-suppressedOrganisational unit
03656 - Bösiger, Peter
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