Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is the gold standard imaging modality for soft tissues. It produces detail cross-sectional images of soft tissue and bone anatomy, including muscles, tendons, ligaments, brain and organs, without the use of ionizing radiation. In addition to orthopedic imaging, MRI is also used for heart, brain and breast. MRI uses gadolinium contrast in many exams to highlight tissues and blood vessels, which enhances images and offers better diagnostic quality. It can also be used in conjunction with PET scans. How does MRI work? MR creates images by using powerful magnets to polarize hydrogen atoms in water (the body is made of of more than 80% water) so they face in one direction. A radiofrequency pulse is then used to ping these atoms, causing them to wobble, or resonate. The MRI coils detect this and computers can assemble images from the signals. Basic MRI scans will focus on the resonance of fat and water in two different sequences, which highlight and contrast different features in the anatomy.

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Take a break? fMRI shows videogaming fatigues brain area associated with attention span

Playing videogames during breaktimes reduces activation in the brain’s supplementary motor area, and the falloff shows up in findings on fMRI and as poorer functional performance in short-term memory tests when people get back to work.

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Why women are skipping their follow-up breast cancer MRI

Women initially deemed to have a less than 2% chance of developing breast cancer often skip the recommended follow-up MRI six months later. Johns Hopkins researchers are attempting to understand why, and recently published some early insights into the issue.

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New MRI technique uses lower magnetic field

National Institutes of Health experts have developed a new high-performing MRI method that uses a low magnetic field and could open a whole new wealth of possibilities for the technology.

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How superheroes are helping one imaging center drop its sedation rates

It can be difficult to convince a child to sit still through an MRI scan, especially without an assist from anesthesiology. One academic medical center is changing that norm with the help of Captain America and Iron Man. 

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Fast MRI scans ID brain injuries in young patients without radiation, sedation

“Fast MRI” scans, which use quicker imaging techniques and don’t require sedation or ionizing radiation, can identify traumatic brain injuries (TBIs) in young patients, according to a new study published in Pediatrics.

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New MRI technique predicts dementia in stroke patients

A new MRI technique using diffusion tensor imaging (DTI) can help predict when patients might suffer from stroke-related dementia, according to new research published in Stroke: A Journal of Cerebral Circulation.

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New MRI technique tracks molecular changes in the brain as it ages

A team of researchers has found that quantitative MRI (qMRI) can be used to monitor molecular changes in the brain, sharing its findings in Nature Communications.

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New MRI technique measures heart strain without gadolinium

Researchers have developed a new MRI technique that allows providers to measure strain in heart muscles without the use of gadolinium, according to new findings published in Scientific Reports.

Around the web

The nuclear imaging isotope shortage of molybdenum-99 may be over now that the sidelined reactor is restarting. ASNC's president says PET and new SPECT technologies helped cardiac imaging labs better weather the storm.

CMS has more than doubled the CCTA payment rate from $175 to $357.13. The move, expected to have a significant impact on the utilization of cardiac CT, received immediate praise from imaging specialists.

The all-in-one Omni Legend PET/CT scanner is now being manufactured in a new production facility in Waukesha, Wisconsin.