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 scan
Study uses brain scans to discover how children 'read' faces
Medicine & Health / Psychology & Psychiatry
Nov 20, 2009 |
not rated yet |
1
(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 |
not rated yet |
0
(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.
1 conjoined twin talking after separation surgery
Nov 19, 2009 |
not rated yet |
0
(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.
EKG can show false positive readings for diagnosing heart condition
Nov 16, 2009 |
not rated yet |
0
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 |
not rated yet |
0
(PhysOrg.com) -- By matching children with rare or life-threatening diseases and modelling potential disease progression, researchers hope to find new routes forward.
iPhone the body electric: New 'apps' visualize human anatomy
Oct 08, 2009 |
4 / 5 (2) |
0
University of Utah researchers created new iPhone programs - known as applications or "apps" - to help scientists, students, doctors and patients study the human body, evaluate medical problems and analyze ...
Healthy older brains not significantly smaller than younger brains, new imaging study shows
Medicine & Health / Neuroscience
Sep 08, 2009 |
5 / 5 (1) |
0
The belief that healthy older brains are substantially smaller than younger brains may stem from studies that did not screen out people whose undetected, slowly developing brain disease was killing off cells in key areas, ...
Experts warn over health check brain scans
Sep 03, 2009 |
5 / 5 (2) |
0
A new study has voiced concern about the growing market for brain screening tests, which people can buy as part of a general health MOT.
MRI may cause more harm than good in newly diagnosed early breast cancer
Aug 13, 2009 |
4 / 5 (1) |
0
A new review says using magnetic resonance imaging (MRI) before surgery to assess the extent of early breast cancer has not been shown to improve surgical planning, reduce follow-up surgery, or reduce the risk of local recurrences. ...
Dips and Swells of Your Brain May Reveal Early Mental Disorders
Medicine & Health / Psychology & Psychiatry
Jul 09, 2009 |
5 / 5 (1) |
2
(PhysOrg.com) -- John Csernansky wants to take your measurements. Not the circumference of your chest, waist and hips. No, this doctor wants to stretch a tape measure around your hippocampus, thalamus and ...
Study challenges routine use of MRI scans to evaluate breast cancer
Jun 26, 2009 |
1 / 5 (1) |
1
Reviewing the records of 577 breast cancer patients, Fox Chase Cancer Center researchers found that women with newly diagnosed breast cancer who receive a breast MRI are more likely to receive a mastectomy after their diagnosis ...
When it comes to intelligence, size matters
Medicine & Health / Neuroscience
Mar 25, 2009 |
4.7 / 5 (6) |
1
A collaborative study led by researchers at the Montreal Neurological Institute (MNI), McGill University has demonstrated a positive link between cognitive ability and cortical thickness in the brains of healthy ...
Study gives more proof that intelligence is largely inherited
Medicine & Health / Neuroscience
Mar 17, 2009 |
4 / 5 (7) |
0
They say a picture tells a thousand stories, but can it also tell how smart you are? Actually, say UCLA researchers, it can.
