Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · May 2011
In vivo detection of GABA and glutamate with MEGA-PRESS: reproducibility and gender effects.
To evaluate the reproducibility of γ-amino-butyric acid (GABA) and glutamate concentrations derived using three different spectral fitting methods, and to investigate gender-related differences in neurotransmitter levels. ⋯ GABA and glutamate can be quantified in vivo with high reproducibility (CV 6-7%) using frequency-domain spectral fitting methods like LCModel. However, the GABA and glutamate concentrations vary significantly between men and women, emphasizing the importance of gender-matching for studies investigating differences in neurotransmitter concentrations between mixed-cohort groups.
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J Magn Reson Imaging · Apr 2011
Effect of MRI strength and propofol sedation on pediatric core temperature change.
To determine core body temperature variations in children undergoing MRI exams on 1.5 Tesla (T) and 3T magnetic field strengths and with and without propofol sedation. ⋯ Clinically significant core body temperature change is uncommon in children undergoing MRI with different magnetic field strengths, and with and without propofol sedation.
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J Magn Reson Imaging · Mar 2011
In vivo three-dimensional MR wall shear stress estimation in ascending aortic dilatation.
To estimate surface-based wall shear stress (WSS) and evaluate flow patterns in ascending aortic dilatation (AscAD) using a high-resolution, time-resolved, three-dimensional (3D), three-directional velocity encoded, radially undersampled phase contrast MR sequence (4D PC-MRI). ⋯ Changes in WSS in the ascending aorta of AscAD correspond to observed alterations in flow patterns compared to controls.
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J Magn Reson Imaging · Feb 2011
Support vector machine multiparametric MRI identification of pseudoprogression from tumor recurrence in patients with resected glioblastoma.
To automatically differentiate radiation necrosis from recurrent tumor at high spatial resolution using multiparametric MRI features. ⋯ Machine learning using multiparametric MRI features may be a promising approach to identify the distribution of radiation necrosis tissue in resected glioblastoma multiforme patients undergoing chemoradiation.
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J Magn Reson Imaging · Feb 2011
Comparative StudyFast spin-echo triple echo dixon: Initial clinical experience with a novel pulse sequence for simultaneous fat-suppressed and nonfat-suppressed T2-weighted spine magnetic resonance imaging.
To evaluate a prototype fast spin-echo (FSE) triple-echo Dixon (FTED) technique for T2-weighted spine imaging with and without fat suppression compared to conventional T2-weighted fast recovery (FR) FSE and short-tau inversion recovery (STIR) imaging. ⋯ FTED efficiently provides both fat-suppressed and nonfat-suppressed T2-weighted spine images with excellent image quality, equal disease depiction, and 56% reduction in scan time compared to conventional STIR and T2 FRFSE.