Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Jul 2006
Comparing real-world advantages for the clinical neuroradiologist between a high field (3 T), a phased array (1.5 T) vs. a single-channel 1.5-T MR system.
To evaluate signal-to-noise ratio (SNR) and neuroradiologists' subjective assessments of image quality in 3-Tesla (3-T) or phased-array MR systems that are now available for clinical neuroimaging. ⋯ Both quantitatively and qualitatively, the phased-array system provided image quality superior to that of the 1.5-T and 3-T single-channel systems.
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J Magn Reson Imaging · Jul 2006
Phase contrast MR imaging to measure changes in collateral blood flow after stenting of recurrent aortic coarctation: initial experience.
To assess the feasibility of using phase contrast magnetic resonance (PC-MR) imaging to measure the change in collateral blood flow early after stenting of aortic coarctation. ⋯ PC-MR can be used to measure changes in collateral circulation after stent treatment of coarctation of the aorta.
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J Magn Reson Imaging · Jul 2006
Prospective longitudinal proton magnetic resonance spectroscopic imaging in adult traumatic brain injury.
To investigate whether longitudinal magnetic resonance proton spectroscopic imaging (MRSI) demonstrates regional metabolite abnormalities after traumatic brain injury (TBI) that predict long-term neurologic outcome. ⋯ The NAA/Cr ratio from the corpus callosum was most useful for outcome prediction. Chronic alterations of metabolite ratios are likely due to neuronal loss and glial proliferation long after injury.
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J Magn Reson Imaging · Jul 2006
Effect of using local arterial input functions on cerebral blood flow estimation.
To investigate a previously developed method for perfusion-weighted MRI (PWI) cerebral blood flow (CBF) estimation that uses local arterial input functions (AIFs) in stroke patients, and determine its ability to correct delay and/or dispersion (D/D) errors. ⋯ The local-AIF technique results in an increase in the calculated CBF values for tissues with D/D, consistent with a reduction in the errors associated with D/D.
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To demonstrate the feasibility of in vivo calf muscle fiber tracking in human subjects. ⋯ The study clearly shows that in vivo fiber tracking of muscle fibers is feasible and could potentially be applied to study muscle structure function relationships.