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
CT: The first-line imaging choice of physicians for the diagnosis of pulmonary embolism
18 hours ago |
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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.
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 ...
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.
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FDA researchers identify new MRI safety risk for patients with pacemakers
Dec 15, 2009 |
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FDA researchers have found that certain cardiac pacemakers may inadequately stimulate a patient's heart while undergoing a magnetic resonance imaging (MRI) scan due to the magnetic pulses mixing with the electronic pulses ...
MRI detects breast cancer at earlier stage
Dec 10, 2009 |
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Magnetic resonance imaging (MRI) coupled with mammography detects almost all cancers at an early stage, thereby reducing the incidence of advanced stage breast cancer in high-risk women.
Annual screening with breast ultrasound or MRI could benefit some women
Dec 02, 2009 |
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Results of a large-scale clinical trial presented today at the annual meeting of the Radiological Society of North America (RSNA) provide the first strong evidence of the benefit of annual screening ultrasound for women with ...
MRI helps detect life-threatening pregnancy complication
Dec 01, 2009 |
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A study presented today at the annual meeting of the Radiological Society of North America (RSNA) revealed that MRI is a highly accurate means of identifying placenta accreta, a potentially life-threatening and increasingly ...
Diffusion tensor imaging increases ability to remove benign tumors in children
Medicine & Health / Neuroscience
Dec 04, 2009 |
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A new study published this week in the Journal of Neurosurgery: Pediatrics finds that operative plans for removing Juvenile Pilocytic Astrocytoma, or JPA, tumors in the thalamus of the brain can be augmented with Diffusion Tensor ...
Most radiation oncologists utilize advanced medical imaging techniques, study suggests
Nov 25, 2009 |
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A recent study shows that 95 percent of radiation oncologists use advanced imaging techniques such as positron emission tomography (FDG-PET), magnetic resonance imaging (MRI), and 4-dimensional computed tomography (4DCT) ...
Tracking new cancer-killing particles with MRI
Nanotechnology / Nanomaterials
Dec 14, 2009 |
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Researchers at Rice University and Baylor College of Medicine (BCM) have created a single nanoparticle that can be tracked in real time with MRI as it homes in on cancer cells, tags them with a fluorescent ...
Severe asymptomatic heart disease may accompany narrowing in leg arteries
Dec 01, 2009 |
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Results of a randomized, controlled clinical trial presented today at the annual meeting of the Radiological Society of North America (RSNA) reveal that one in five patients with narrowing or blockage in arteries that supply ...
Overweight children may develop back pain and spinal abnormalities
Dec 01, 2009 |
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Being overweight as a child could lead to early degeneration in the spine, according to a study presented today at the annual meeting of the Radiological Society of North America (RSNA).
Researchers are on the path to creating nano-MRI images
Dec 22, 2009 |
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(PhysOrg.com) -- Cornell researchers are devising methods to detect the magnetic fields of individual electrons and atomic nuclei, which they hope to use to make a nanoscale version of magnetic resonance imaging.
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