Regional variations in normal brain shown by quantitative magnetization transfer imaging.

Autor: Sled JG; McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada. jgsled@sickkids.ca, Levesque I, Santos AC, Francis SJ, Narayanan S, Brass SD, Arnold DL, Pike GB
Jazyk: angličtina
Zdroj: Magnetic resonance in medicine [Magn Reson Med] 2004 Feb; Vol. 51 (2), pp. 299-303.
DOI: 10.1002/mrm.10701
Abstrakt: A quantitative magnetization transfer imaging (qMTI) study, based on a two-pool model of magnetization transfer, was performed on seven normal subjects to determine, on a regional basis, normal values for the pool sizes, exchange, and relaxation parameters that characterize the MT phenomenon. Regions were identified on high-resolution anatomical scans using a combination of manual and automatic methods. Only voxels identified as pure tissue at the resolution of the quantitative scans were considered for analysis. While no left/right differences were observed, significant differences were found among white-matter regions and gray-matter regions. These regional differences were compared with existing cytoarchitectural data. In addition, the pattern and magnitude of the regional differences observed in white matter was found to be different from that reported previously for an alternative putative MRI measure of myelination, the 10-50-ms T2 component described as myelin water.
(Copyright 2004 Wiley-Liss, Inc.)
Databáze: MEDLINE
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