Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Mar 2007
Visualization of hemodynamics in intracranial arteries using time-resolved three-dimensional phase-contrast MRI.
To visualize the hemodynamics of the intracranial arteries using time-resolved three-dimensional phase-contrast (PC)-MRI (4D-Flow). ⋯ 4D-Flow helped to elucidate the in vivo 3D hemodynamics of human intracranial arteries. This method may be a useful noninvasive means of analyzing the hemodynamics of intracranial arteries in vivo.
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To study the feasibility of three-dimensional (3D) whole-body, head-to-toe, water/fat resolved MRI, using continuously moving table imaging technology. ⋯ Whole-body water/fat sensitive MRI using continuous table motion is feasible and could be of interest for clinical practice. Some improvements of the method are desirable.
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J Magn Reson Imaging · Mar 2007
Selective maximization of (31)P MR spectroscopic signals of in vivo human brain metabolites at 3T.
To develop a short TR, short TE, large flip angle (LFA), in vivo (31)P MR spectroscopy (MRS) technique at 3T that selectively maximizes the signal-to-noise ratio (SNR) of long T(1) human brain metabolites implicated in bipolar disorder. ⋯ The data show that the LFA technique can be employed in vivo to maximize the signal of long T(1) (31)P brain metabolites at a given TE and TR. LFAs ranging between 120 degrees and 150 degrees are shown to maximize the (31)P signal of human brain metabolites at 3T.
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J Magn Reson Imaging · Mar 2007
Correction of proton resonance frequency shift temperature maps for magnetic field disturbances using fat signal.
To improve the immunity of the proton resonance frequency shift (PRFS) method of MRI temperature mapping against magnetic field disturbances. Since PRFS is a phase-sensitive method, it misinterprets magnetic field disturbances as artifact temperature changes. If not corrected, the resulting temperature artifacts can completely obscure the true temperature estimation, especially if the temperature elevations are small. ⋯ Our approach can be used for the guidance of thermal therapies involving tissues containing fat or surrounded by fat.
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J Magn Reson Imaging · Mar 2007
Comparative Study Controlled Clinical TrialDifferentiation of SCA2 from MSA-C using proton magnetic resonance spectroscopic imaging.
To assess and compare biochemical and volumetric features of the cerebellum in patients with spinocerebellar ataxia type 2 (SCA2) and patients with the cerebellar variant of multiple system atrophy (MSA-C). ⋯ MRSI revealed Lac pathology in SCA2 but not in MSA-C. Whether this indicates distinct pathogenetic mechanisms of cerebellar degeneration remains to be established.