News tagged with magnetic resonance imaging

Related topics: brain · breast cancer · brain regions · functional magnetic resonance imaging · brain images

More research needed on evaluation of dense breasts

A systematic review of the scientific literature on dense breasts by researchers at UC Davis and other institutions has found that determinations of breast density can be unreliable and that as many as 19 percent of women ...

Jan 11, 2016
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New device approved for fecal incontinence

(HealthDay)—The Fenix Continence Restoration System has been approved by the U.S. Food and Drug Administration to treat an inability to control bowel movements for people who can't tolerate or use other approved methods.

Dec 18, 2015
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UA researchers developing brain-mapping technology

Researchers at the University of Arizona are developing a noninvasive brain-scanning technology that could produce images far superior to those obtained with the most commonly used systems—electroencephalography and functional ...

Dec 17, 2015
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Magnetic resonance imaging

Magnetic 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.

This text uses material from Wikipedia, licensed under CC BY-SA

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