Definitions for magnetic resonance imaging
This page provides all possible meanings and translations of the word magnetic resonance imaging
Random House Webster's College Dictionary
magnet′ic res′onance im`aging(n.)
a process of producing images of the body regardless of intervening bone by means of a strong magnetic field and low-energy radio waves.
Ref: Abbr.: MRI
magnetic resonance imaging, MRI(noun)
the use of nuclear magnetic resonance of protons to produce proton density images
magnetic resonance imaging(Noun)
A technique that uses nuclear magnetic resonance to form cross sectional images of the human body for diagnostic purposes.
Magnetic resonance imaging
Magnetic resonance imaging, nuclear magnetic resonance imaging, or magnetic resonance tomography is a medical imaging technique used in radiology to visualize internal structures of the body in detail. MRI makes use of the property of nuclear magnetic resonance to image nuclei of atoms inside the body. MRI can create more detailed images of the human body than possible with X-rays. An MRI scanner is a device in which the patient lies within a large, powerful magnet where the magnetic field is used to align the magnetization of some atomic nuclei in the body, and radio frequency magnetic fields are applied to systematically alter the alignment of this magnetization. This causes the nuclei to produce a rotating magnetic field detectable by the scanner—and this information is recorded to construct an image of the scanned area of the body. Magnetic field gradients cause nuclei at different locations to precess at different speeds, which allows spatial information to be recovered using Fourier analysis of the measured signal. By using gradients in different directions, 2D images or 3D volumes can be obtained in any arbitrary orientation. MRI provides good contrast between the different soft tissues of the body, which makes it especially useful in imaging the brain, muscles, the heart, and cancers compared with other medical imaging techniques such as computed tomography or X-rays. Unlike CT scans or traditional X-rays, MRI does not use ionizing radiation.
U.S. National Library of Medicine
Magnetic Resonance Imaging
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.
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"magnetic resonance imaging." Definitions.net. STANDS4 LLC, 2014. Web. 22 Nov. 2014. <http://www.definitions.net/definition/magnetic resonance imaging>.