Related topics: brain , magnetic resonance imaging
Magnetic resonance imaging
hideMagnetic Resonance Imaging (MRI), or nuclear magnetic resonance imaging (NMRI), is primarily a medical imaging technique most commonly used in radiology to visualize the internal structure and function of the body. MRI provides much greater contrast between the different soft tissues of the body than computed tomography (CT) does, making it especially useful in neurological (brain), musculoskeletal, cardiovascular, and oncological (cancer) imaging. Unlike CT, it uses no ionizing radiation, but uses a powerful magnetic field to align the nuclear magnetization of (usually) hydrogen atoms in water in the body. Radio frequency (RF) fields are used to systematically alter the alignment of this magnetization, causing the hydrogen nuclei to produce a rotating magnetic field detectable by the scanner. This signal can be manipulated by additional magnetic fields to build up enough information to construct an image of the body.:36
Magnetic Resonance Imaging is a relatively new technology. The first MR image was published in 1973 and the first cross-sectional image of a living mouse was published in January 1974. The first studies performed on humans were published in 1977. By comparison, the first human X-ray image was taken in 1895.
Magnetic Resonance Imaging was developed from knowledge gained in the study of nuclear magnetic resonance. In its early years the technique was referred to as nuclear magnetic resonance imaging (NMRI). However, as the word nuclear was associated in the public mind with ionizing radiation exposure it is generally now referred to simply as MRI. Scientists still use the term NMRI when discussing non-medical devices operating on the same principles. The term Magnetic Resonance Tomography (MRT) is also sometimes used.
For more information about Magnetic resonance imaging, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with mri
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Jan 26, 2010 |
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Dutch researchers from the University of Twente's MIRA research institute, UMC St Radboud and various other institutions have developed a highly detailed computer model of the musculoskeletal system of the ...
Little pill means big news in the treatment of MS
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Jan 08, 2010 |
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(PhysOrg.com) -- New experiments on a recently discovered class of iron-based superconductors suggest that the ability of their electrons to conduct electricity without resistance is directly connected with the magnetic properties ...
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Dec 22, 2009 |
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Computed tomography (CT), a highly accurate, readily available medical imaging technique, is the overwhelmingly preferred technique of emergency physicians and radiologists for the diagnosis of pulmonary embolism (PE), according ...
Elevated-risk women refuse MRI breast cancer screening
Dec 22, 2009 |
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In a new study published in the January issue of Radiology, 42 percent of women eligible for breast cancer screening with MRI declined to undergo the procedure.
New imaging technique reveals different heart motions by age, gender
Dec 08, 2009 |
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Using a new noninvasive imaging technique, scientists said they have discovered important, fundamental differences in heart motion by age and gender.
Dutch PhD student develops device to combat noise
Dec 01, 2009 |
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Johan Wesselink of the University of Twente, The Netherlands, has developed a device to actively combat noise nuisance. This invention curtails sound waves and vibrations by producing anti-noise. The researcher is confident ...
Study uses brain scans to discover how children 'read' faces
Medicine & Health / Psychology & Psychiatry
Nov 20, 2009 |
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(PhysOrg.com) -- Oxford University scientists are using brain-scanning technology to understand how we learn to recognise and 'read' faces as children.
Formerly conjoined twins to need years of care
Nov 20, 2009 |
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(AP) -- Formerly conjoined Bangladeshi twins separated this week in a marathon surgery will remain in the care of a humanitarian group for at least two years, the organization's CEO said Friday.
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Nov 19, 2009 |
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(AP) -- A Bangladeshi toddler separated this week from her conjoined twin sister was talking and behaving normally Thursday after waking from a medically induced coma, the head of the surgery team said.
Analyzing structural brain changes in Alzheimer's disease
Nov 16, 2009 |
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In a study that promises to improve diagnosis and monitoring of Alzheimer's disease, scientists at the University of California, San Diego have developed a fast and accurate method for quantifying subtle, ...
EKG can show false positive readings for diagnosing heart condition
Nov 16, 2009 |
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The electrical measurements on the electrocardiogram can often mislead physicians in diagnosing the heart condition left ventricular hypertrophy, causing other screening tests to be ordered before a definitive conclusion ...
Disease-matching software could save children
Nov 13, 2009 |
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(PhysOrg.com) -- By matching children with rare or life-threatening diseases and modelling potential disease progression, researchers hope to find new routes forward.
