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Magnetic Resonance Imaging definition: Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
magnetic resonance imaging definition: non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images; concept includes proton spin tomographic techniques.
nuclear magnetic resonance imaging definition: (mag-NET-ik REZ-o-nans IM-a-jing) MRI. A procedure in which a magnet linked to a computer is used to create detailed pictures of areas inside the body. Also called nuclear magnetic resonance imaging.
Magnetic Resonance Imaging definition: Imaging that uses radiofrequency waves and a strong magnetic field rather than x-rays to provide amazingly clear and detailed pictures of internal organs and tissues. The technique is valuable for the diagnosis of many pathologic conditions, including cancer, heart and vascular disease, stroke, and joint and musculoskeletal disorders.
Magnetics definition: The study of magnetic phenomena and magnetic fields. Magnetism produced by electric currents is ELECTROMAGNETICS.
Nuclear Magnetic Resonance definition: A physical phenomenon involving the interaction of atomic nuclei placed in an external magnetic field with an applied electromagnetic field oscillating at a particular frequency. Magnetic conditions within the material are measured by monitoring the radiation absorbed and emitted by the atomic nuclei. It is the underlying principle of Magnetic Resonance Imaging (MRI).
Echo-Planar Imaging definition: A type of MAGNETIC RESONANCE IMAGING that uses only one nuclear spin excitation per image and therefore can obtain images in a fraction of a second rather than the minutes required in traditional MRI techniques. It is used in a variety of medical and scientific applications.
Echo-Planar Imaging definition: A type of Magnetic Resonance Imaging that uses only one nuclear spin excitation per image and therefore can obtain images in a fraction of a second rather than the minutes required in traditional MRI techniques. It is used in a variety of medical and scientific applications.(From MSH 2001).
Magnetic Resonance Angiography definition: Non-invasive method of vascular imaging and determination of internal anatomy without injection of contrast media or radiation exposure. The technique is used especially in CEREBRAL ANGIOGRAPHY as well as for studies of other vascular structures.
Magnetic Resonance Imaging, Cine definition: A type of imaging technique used primarily in the field of cardiology. By coordinating the fast gradient-echo MRI sequence with retrospective ECG-gating, numerous short time frames evenly spaced in the cardiac cycle are produced. These images are laced together in a cinematic display so that wall motion of the ventricles, valve motion, and blood flow patterns in the heart and great vessels can be visualized.
COIL, MAGNETIC RESONANCE, SPECIALTY definition: A magnetic resonance diagnostic device is intended for general diagnostic use to present images which reflect the spatial distribution and/or magnetic resonance spectra which reflect frequency and distribution of nuclei exhibiting nuclear magnetic resonance. Other physical parameters derived from the images and/or spectra may also be produced. The device includes hydrogen-1 (proton) imaging, sodium-23 imaging, hydrogen-1 spectroscopy, phosphorus-31 spectroscopy, and chemical shift imaging (preserving simultaneous frequency and spatial information).
Nuclear Magnetic Resonance, Biomolecular definition: NMR spectroscopy on small- to medium-size biological macromolecules. This is often used for structural investigation of proteins and nucleic acids, and often involves more than one isotope.
magnetism definition: processes and behaviors associated with magnetic fields.
magnetic field definition: portion of space near a magnetic body or a current-carrying body in which the magnetic forces due to the body or current can be detected.
circular magnetic dichroism definition: magnetically induced circular dichroism is the differential absorption of left and right circularly polarized light in the presence of a magnetic field; measurements are made by taking a circular dichroism, or CD measurement, with the magnetization oriented in the positive sense, and then a CD measurement with the magnetization oriented in the negative sense; the two signals are then subtracted.
Cholangiopancreatography, Magnetic Resonance definition: Non-invasive diagnostic technique for visualizing the PANCREATIC DUCTS and BILE DUCTS without the use of injected CONTRAST MEDIA or x-ray. MRI scans provide excellent sensitivity for duct dilatation, biliary stricture, and intraductal abnormalities.
Diffusion Magnetic Resonance Imaging definition: A diagnostic technique that incorporates the measurement of molecular diffusion (such as water or metabolites) for tissue assessment by MRI. The degree of molecular movement can be measured by changes of apparent diffusion coefficient (ADC) with time, as reflected by tissue microstructure. Diffusion MRI has been used to study BRAIN ISCHEMIA and tumor response to treatment.
Diffusion MRI definition: MRI method that measure the diffusion of water in the tissue, rather than the content of water as measured in conventional MRI.
diffusion magnetic resonance imaging definition: diagnostic technique that incorporates the measurement of molecular diffusion (such as water or metabolites) for tissue assessment by MRI; degree of molecular movement can be measured by changes of apparent diffusion coefficient with time, as reflected by tissue microstructure; used to study brain ischemia and tumor response to treatment.
Ferumoxytol definition: A superparamagnetic iron oxide nanoparticle coated with a low molecular weight semi-synthetic carbohydrate, polyglucose sorbitol carboxymethyl ether, with potential anti-anemic and imaging properties. After intravenous administration, ferumoxytol replaces iron stores with fewer side effects compared to the use of oral iron. In addition, this agent generates T1 relaxation, producing a magnetic field and enhancing T2 relaxation, thereby darkening contrast media-containing structures in magnetic resonance imaging (MRI). Due to small particle size, ferumoxytol remains in the intravasculature for a prolonged period and so may be used as a blood pool agent. (NCI05)
ferumoxytol definition: A superparamagnetic iron oxide nanoparticle coated with a low molecular weight semi-synthetic carbohydrate, polyglucose sorbitol carboxymethyl ether, with potential anti-anemic and imaging properties. After intravenous administration, ferumoxytol replaces iron stores with fewer side effects compared to the use of oral iron. In addition, this agent generates T1 relaxation, producing a magnetic field and enhancing T2 relaxation, thereby darkening contrast media-containing structures in magnetic resonance imaging (MRI). Due to small particle size, ferumoxytol remains in the intravasculature for a prolonged period and so may be used as a blood pool agent. Check for "http://www.cancer.gov/Search/ClinicalTrialsLink.aspx?id=377345&idtype=1" active clinical trials or "http://www.cancer.gov/Search/ClinicalTrialsLink.aspx?id=377345&idtype=1&closed=1" closed clinical trials using this agent. ("http://nciterms.nci.nih.gov:80/NCIBrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&code=C38138" NCI Thesaurus)
Magnetic Resonance Elastography definition: This imaging technique returns information about the mechanical properties (feel) of tissues by combining MRI with ultrasound. A properly equipped MRI machine captures a cross sectional image of the sound waves, produced by ultrasound techniques, which are then processed by computer to produce an image showing the hardness or elasticity of tissues within the cross section.
Magnetic resonance definition: Computed, Magnetic resonance
LOCATOR, MAGNETIC definition: A permanent magnet is a nonelectric device that generates a magnetic field intended to find and remove metallic foreign bodies from eye tissue.
Electro-magnetic interference (EMI) definition: Issue associated with a measure of electromagnetic radiation from equipment.
Magnetic Field Therapy definition: The magnetic stimulation of specific target tissues or areas of the body for therapeutic purposes via the application of magnetic fields generated by magnets or electromagnets.