Results 211 to 220 of about 158,204 (264)
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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 ...
M, Doran, G M, Bydder
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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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Diffusion-Weighted Magnetic Resonance Imaging
2018Magnetic resonance imaging (MRI) is a technique based on the contents and relaxation features of water in tissues. In basic MRI sequences, diffusion phenomenon of water molecules is not taken into account although it has a notable influence in the relaxation times, and therefore in the signal intensity of images.
Irene, Guadilla +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 ...
Fernanda Philadelpho Arantes, Pereira +2 more
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Functional Diffusion Magnetic Resonance Imaging
2018Functional diffusion magnetic resonance imaging (fDMRI) is a noninvasive technique that allows elucidating physiological and anatomical changes at a microscopic scale by detection of water molecular displacements in tissue structures. These displacements likely reflect microstructural changes associated with neuronal or glial cells activation.
Rita Maria Rocha, Oliveira +2 more
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Diffusion-Weighted Magnetic Resonance Imaging
1997Contrast in magnetic resonance imaging (MRI) is generated by exploiting a variety of physicochemical properties. Conventional clinical MRI techniques are largely based upon disease-induced changes in water relaxation, but these have been complemented by a number of other approaches, including a sensitization to the diffusion of water. It has been shown
King, M. +3 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 in the Head and Neck
Magnetic Resonance Imaging Clinics of North America, 2011Diffusion weighting (DW) represents a magnetic resonance imaging contrast distinct from T1 and T2 in terms of imaging physics and its relationship to underlying physiology and pathophysiology. DW imaging has become a sine qua non of neuroimaging because of its exquisite sensitivity to the molecular motion of water that is altered in many pathologic ...
James, Schafer +2 more
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Pelvic Applications of Diffusion Magnetic Resonance Images
Magnetic Resonance Imaging Clinics of North America, 2011Diffusion-weighted imaging (DWI) is a powerful imaging technique in neuroimaging; its value in abdominal and pelvic imaging has only recently been appreciated as a result of improvements in magnetic resonance imaging technology. There is growing interest in the use of DWI for evaluating pathology in the pelvis. Its ability to noninvasively characterize
Antonio C, Coutinho +4 more
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