MTR variations in normal adult brain structures using balanced steady-state free precession
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Meritxell Garcia & Monika Gloor & Oliver Bieri & Stephan G. Wetzel & Ernst-Wilhelm Radue & Klaus Scheffler
- چاپ و سال / کشور: 2011
Description
Introduction Magnetization transfer (MT) is sensitive to the macromolecular environment of water protons and thereby provides information not obtainable from conventional magnetic resonance imaging (MRI). Compared to standard methods, MT-sensitized balanced steady-state free precession (bSSFP) offers high-resolution images with significantly reduced acquisition times. In this study, high-resolution magnetization transfer ratio (MTR) images from normal appearing brain structures were acquired with bSSFP. Methods Twelve subjects were studied on a 1.5 T scanner. MTR values were calculated from MT images acquired in 3D with 1.3 mm isotropic resolution. The complete MT data set was acquired within less than 3.5 min. Forty-one brain structures of the white matter (WM) and gray matter (GM) were identified for each subject. Results MTR values were higher for WM than GM. In general, MTR values of the WM and GM structures were in good accordance with the literature. However, MTR values showed more homogenous values within WM and GM structures than previous studies. Conclusions MT-sensitized bSSFP provides isotropic high-resolution MTR images and hereby allows assessment of reliable MTR data in also very small brain structures in clinically feasible acquisition times and is thus a promising sequence for being widely used in the clinical routine. The present normative data can serve as a reference for the future characterization of brain pathologies.
Neuroradiology (2011) 53:159–167 DOI 10.1007/s00234-010-0714-5 Received: 23 March 2010 / Accepted: 30 April 2010 / Published online: 18 May 2010
