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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.
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).
SYSTEM, NUCLEAR MAGNETIC RESONANCE IMAGING 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).
Scanning Systems, Magnetic Resonance Imaging definition: Scanning systems that use strong magnetic fields, radio-frequency (RF) radiation, and computerized processes to translate hydrogen nuclei distribution (some systems can translate other nuclei exhibiting nuclear magnetic resonance) in body tissue into images of anatomic structures. Following exposure to high magnetic and RF fields, body-tissue nuclei emit low-power RF signals that are detected by the system RF receiver. The computer uses these RF data to construct an image of the exposed tissue. Magnetic resonance imaging (MRI) systems consist of a primary magnet (resistive, superconductive, or permanent); gradient magnets; an RF subsystem, including an RF transmitter/receiver and coils; a patient table; a computer subsystem, including software for image processing, display monitors, and a data storage unit; and an operator console. MRI scanning systems are used to obtain high-resolution images with good contrast of tissues without using ionizing radiation. Most of these systems are used to distinguish normal from diseased tissue and to diagnose and track the progress and treatment of diseases (e.g., cancer, brain edema, iron storage).
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.
nuclear magnetic resonance spectroscopy definition: spectroscopic method of measuring the characteristic energy absorbed and reemitted or dispersed by nuclei that are subjected to a static magnetic field and simultaneously irradiated with radiofrequency radiation; measurement of the magnetic moment of elementary particles such as atomic nuclei, protons or electrons.
Multidimensional NMR Techniques definition: Various NMR methods that can be used to determine 3D structures of macromolecules.
 
frFrench
remnographie definition: Image de la répartition dans l'organisme de certains atomes à partir de leur résonance magnétique nucléaire (RMN).
 
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