Radiology & Imaging

AI-based system could help triage brain MRIs

An artificial intelligence-driven system that automatically combs through brain MRIs for abnormalities could speed care to those who need it most, according to a study published in Radiology: Artificial Intelligence.

Oncology & Cancer

An important step towards live imaging in proton therapy

Researchers at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) want to build the world's first prototype that tracks moving tumors with magnetic resonance imaging (MRI) in real time during proton therapy. They are combining ...

Neuroscience

Incidental findings on brain MRI common in children

(HealthDay)—More than 20 percent of children have incidental findings (IFs) on brain magnetic resonance imaging (MRI) conducted at age 9 to 10 years, according to a study published online March 22 in JAMA Neurology.

Gerontology & Geriatrics

Some folks do age slower than others

(HealthDay)—People really do vary in how fast they age, and the divergence starts in young adulthood, a new study suggests.

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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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