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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Lyme disease neuroimaging uncovers compensatory brain repair

Lyme disease patients treated for “brain fog” may develop compensatory alterations in white matter that show up on MRI and correspond—unexpectedly—with slow but sound cognitive performance.

November 9, 2022
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Neuroimaging recedes behind other cost compilers in stroke care

Contrary to older research that showed neuroimaging emerging as the single most dominating cost contributor in ischemic stroke care for older Americans, a new study shows treatment and other line items account for bigger slices of the bill.

November 8, 2022
MRI system advances include helium-free MRI systems (left is Philips version of this system), and compressed sensing (right, GE's version of this technology), which can greatly reduce scan times. Both technologies were mentioned in an overview by Signet Research of new tech that will be at RSNA 2022.

VIDEO: Overview of MRI market and technology trends

Bhvita Jani, research manager, Signify Research, explains some key trends and technology advances in the magnetic resonance imaging (MRI) market leading into the Radiological Society of North America (RSNA) 2022 meeting. 

November 3, 2022
The University of Southern California was among the first imaging centers in the U.S. to install a 7T MRI. This high-end part of the MRI market is small and is mainly made up of academic research centers. The main MRI market is made of of 1.5T systems, but there is rising demand for 3T, which Signify research may eventually become the standard for MRI.

Top MRI trends include helium-free systems, compressed sensing and AI

Signify Research outlines several key technologies and trends in MRI to look for at the Radiological Society of North America 2022 meeting.

November 3, 2022
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Philips running short on MRI coil disposables, FDA advising providers to consider image-guidance alternatives

In a letter to providers, the agency recommends Philips clients in the affected product category consider any of three steps to cope with the interruption. 

October 31, 2022
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X-rays may suffice for assessing some low-back fractures

It’s unlikely radiography will unseat MRI for routinely distinguishing between acute and chronic compression fractures of the lumbar vertebrae, but certain X-ray findings might, in cases, obviate the need for the pricier imaging option.

October 28, 2022
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The brain imaging-based argument for letting kids play video games

Functional MRI brain imaging studies have revealed higher brain activity associated with attention and memory for gamers who play three or more hours per day. 

October 27, 2022
Safety information for patients taking Aduhelm has been updated by the FDA to include the addition of two MRI scans during the first year of treatment. #alzheimers #alzheimerstreatment

Depression treatments can change the brain’s infrastructure in just 6 weeks

The adult brain may be more malleable than scientists previously thought, according to new research presented at the 35th European College of Neuropsychopharmacology.

October 19, 2022

Around the web

"This was an unneeded burden, which was solely adding to the administrative hassles of medicine," said American Society of Nuclear Cardiology President Larry Phillips.

SCAI and four other major healthcare organizations signed a joint letter in support of intravascular ultrasound. 

The newly approved AI models are designed to improve the detection of pulmonary embolisms and strokes in patients who undergo CT scans.

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