Cardiology

New imaging tool for diagnosing heart disease

An international team led by scientists from Lawson Health Research Institute and Cedars-Sinai Medical Center are the first to show that Magnetic Resonance Imaging (MRI) can be used to measure how the heart uses oxygen for ...

Pediatrics

3-D images reveal how infants' heads change shape during birth

Using Magnetic Resonance Imaging (MRI), scientists have captured 3-D images that show how infants' brains and skulls change shape as they move through the birth canal just before delivery. Olivier Ami of Auvergne University ...

Psychology & Psychiatry

CBD reduces impairment caused by cannabis

The more cannabidiol (CBD) in a strain of cannabis, the lower the impairment to brain function, finds a new UCL-led brain imaging study.

Neuroscience

Rewiring the brains of stroke patients

Neuroscientist and physical therapist Andrew Butler, professor in the Department of Physical Therapy and associate dean for research at the Byrdine F. Lewis College of Nursing & Health Professions, discusses how he is mobilizing ...

page 1 from 23

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