Results 291 to 300 of about 660,753 (347)
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Diffusion-Weighted Magnetic Resonance Imaging
Journal of Neuro-Ophthalmology, 2002Diffusion-weighted magnetic resonance imaging is a specialized technique that measures the degree of diffusion of water molecules within extracellular space and between intracellular and extracellular space. Diffusion-weighted imaging signal is high (bright) when diffusion is restricted, as occurs in cytotoxic damage from ischemia, inflammation, trauma,
Suresh K. Mukherji +2 more
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Magnetic resonance: perfusion and diffusion imaging
Neuroradiology, 1990The use of magnetic resonance imaging to detect normal and pathological problems of perfusion and diffusion is reviewed. Motion sensitised spin-echo images can be used to detect changes in slow flow velocity within a voxel (intravoxel coherent motion (IVCM)) as well as intravoxel incoherent motion (IVIM) effects attributable to both diffusion and ...
Graeme M. Bydder, M. Doran
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Diffusion of magnetic resonance imaging in Iran
International Journal of Technology Assessment in Health Care, 2007Objectives:The aim of this article is to describe the diffusion of magnetic resonance imaging (MRI) in Iran, including regional variations during the period of 1990 to 2005 and international comparisons.Methods:Data on the diffusion of MRI were obtained from the Medical Equipment Office of the Ministry of Health (MOH) and, using self-administered ...
Mohammad Palesh +4 more
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Magnetic resonance imaging of diffusion and perfusion
Topics in Magnetic Resonance Imaging, 1991Two promising advances in MRI have recently evolved. Water proton directional "diffusion" as well as "perfusion" processes can be imaged in a rapid (on the order of milliseconds) and accurate manner. MR diffusion imaging is shown to effectively allow determination of the presence of anisotropic water diffusion in animal and human cerebral and spinal ...
John Kucharczyk +2 more
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Diffusion Magnetic Resonance Imaging of the Breast
Magnetic Resonance Imaging Clinics of North America, 2011Several studies have investigated the role of advanced magnetic resonance imaging (MRI) techniques, such as diffusion-weighted imaging (DWI), to improve the specificity of MRI for the evaluation of breast lesions. Potential roles for DWI and the apparent diffusion coefficient in characterizing breast tumors and distinguishing malignant from benign ...
Raquel de Vasconcellos Carvalhaes de Oliveira +2 more
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Diffusion Magnetic Resonance Imaging in Multiple Sclerosis
Neuroimaging Clinics of North America, 2011Multiple sclerosis (MS) is considered the most common inflammatory autoimmune neurologic disorder and the most frequent cause of nontraumatic neurologic disability in young and middle-age adults. This article reviews the basic features of its magnetic resonance (MR) imaging lesions and, primarily, the use of diffusion MR imaging, which is increasingly ...
da Cruz, L.C.H. +3 more
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Magnetization Transfer and Diffusion Tensor Magnetic Resonance Imaging [PDF]
, 2002 Patients with primary progressive (PP) multiple sclerosis (MS) represent a subgroup with clinical and magnetic resonance (MR) imaging (MRI) characteristics which differ from those of patients with relapsing-remitting (RR) MS or secondary progressive (SP) MS [1,2]. Although they experience a progressive disease course from onset, the burden and activity
Rovaris M +2 more
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Measurement of thermal diffusivity by magnetic resonance imaging
Magnetic Resonance Imaging, 2006Nuclear magnetic resonance (NMR) may be used for monitoring temperature changes within samples based on measurements of relaxation times, the diffusion coefficient of liquids, proton resonance frequency or phase shifts. Such methods may be extended to the explicit measurement of the thermal diffusivity of materials by NMR imaging.
David H. Gultekin, John C. Gore
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Diffusion magnetic resonance imaging: a biomarker for treatment response in oncology.
Journal of Clinical Oncology, 2007Imaging of response to oncology treatments, either on clinical protocol or as part of standard practice, is a complicated process that has evolved during the last 10 years due to the improvement of existing imaging technologies and the introduction of ...
D. Hamstra, A. Rehemtulla, B. Ross
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Phenylketonuria: Diffusion Magnetic Resonance Imaging and Proton Magnetic Resonance Spectroscopy
Journal of Computer Assisted Tomography, 2003Two patients with phenylketonuria are reported with white matter lesions. Diffusion magnetic resonance (MR) imaging revealed restricted diffusion patterns (high signal) on b = 1000 s/mm2 images associated with low apparent diffusion coefficient values ranging between 0.44 x 10-3 mm2/s and 0.56 x 10-3 mm2/s.
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