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. |
| Notes: |
GEN or unspecified; prefer specifics; do not confuse with MAGNETIC RESONANCE SPECTROSCOPY: check text; coord with disease, organ or tissue using pertinent qualifs; DF: MRI |
| Also Called: |
fMRI,Imaging, Chemical Shift,Magnetization Transfer Contrast Imaging,MRI Scans,Tomography, NMR,Tomography, Proton Spin |
| Previously Indexed: |
Nuclear Magnetic Resonance (1966-1987) |
Magnetic Resonance Imaging Categories.
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Diffusion Magnetic Resonance Imaging - 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. |
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Echo-Planar Imaging - 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. |
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Magnetic Resonance Angiography - 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. |
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Magnetic Resonance Imaging, Cine - 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. |
Magnetic Resonance Imaging Definitions and Terms
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