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 ...

Cancer

New, revised topics released in ACR appropriateness criteria

(HealthDay)—The latest edition of the American College of Radiology (ACR) Appropriateness Criteria has been released and includes 188 diagnostic imaging and interventional radiology topics, with 908 clinical variants covering ...

Psychology & Psychiatry

Negative emotions can reduce our capacity to trust

It is no secret that a bad mood can negatively affect how we treat others. But can it also make us more distrustful? Yes, according to a new study, which shows that negative emotions reduce how much we trust others, even ...

Neuroscience

New MRI sensor can image activity deep within the brain

Calcium is a critical signaling molecule for most cells, and it is especially important in neurons. Imaging calcium in brain cells can reveal how neurons communicate with each other; however, current imaging techniques can ...

Medical research

MRI and computer modeling reveals how wrist bones move

We use our wrists constantly, but how do they work? In a just-published Journal of Biomechanics article, the researchers proved a longtime assumption about individuals' right and left wrists, while also finding differences ...

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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.

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