Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Nov 2002
Single-voxel long TE 1H-MR spectroscopy of the normal brainstem and cerebellum.
To evaluate the feasibility of single voxel 1H-MRS of the CNS structures contained in the posterior cranial fossa and to determine the distribution of the normal metabolite ratios, concentrations, and T2 relaxation times in the midbrain, pons, medulla, dentate nucleus and cerebellar vermis. ⋯ With the exception of the medulla, single voxel 1H-MRS enables an in vivo biochemical analysis of the CNS structures contained in the posterior cranial fossa. Regional differences in the metabolite ratios and concentrations must be considered when employing 1H-MRS for evaluation of diseases of the brainstem and cerebellum.
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J Magn Reson Imaging · Nov 2002
Tissue thermal conductivity by magnetic resonance thermometry and focused ultrasound heating.
To investigate the combined use of magnetic resonance (MR) temperature imaging and focused ultrasound (FUS) for the noninvasive determination of tissue thermal properties. ⋯ This study has developed a method for determining tissue thermal properties specific to the patient and organ at the site of interest, and allows repeated application. This capability is relevant in thermal therapy planning of tumor ablation using MR-guided FUS systems.
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J Magn Reson Imaging · Nov 2002
Multiplanar MR temperature-sensitive imaging of cerebral thermal treatment using interstitial ultrasound applicators in a canine model.
To study the feasibility of an interleaved gradient-echo, echo-planar imaging (iGE-EPI) sequence for multiplanar magnetic resonance temperature imaging (MRTI) to monitor intracerebral thermal treatment three-dimensionally using multielement ultrasound applicators. ⋯ Multiplanar MRTI is feasible for measuring necrosing thermal doses during intracerebral thermal delivery by interstitial ultrasound applicators.
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To examine functional magnetic resonance imaging (fMRI) of the rat cervical spinal cord using painful stimulation. ⋯ Spinal fMRI using electrical stimulation and capsaicin-induced painful stimulation can be a useful tool in an animal model of pain and injury.