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Children's National Medical Center Breaks MRI Speed Sound Barrier
Date:5/8/2012

BETHESDA, Md., May 8, 2012 /PRNewswire/ -- A team of scientists led by Dr. Stanley Fricke of the Children's National Medical Center in Washington DC, broke the "Magnetic resonance imaging (MRI) sound barrier," a finding that could lead to a hundred-fold increase in MRI speed, according to a new clinical study published this week in the peer-reviewed journal Medical Physics. "Our ultimate goal," said Dr. Fricke, "is to image small children in seconds rather than minutes. In this way children will not need to be anesthetized prior to imaging."

Past attempts to substantially accelerate MR imaging failed because gradient pulse sequences (the technology responsible for image formation in an MR machine) can cause twitching or more serious nerve stimulation. To prevent such unwanted and potentially dangerous side effects, the FDA and European regulators put in place limits on gradient strength and speed, based on older clinical studies that used relatively slow gradients. The new Medical Physics study used pulse sequences with rise times 100x faster than conventional MRI to prove that nerve stimulation could be eliminated by employing ultra-fast magnetic gradients.

According to Dr. Fricke, "the old speed limits may need to be reviewed in light of this new data. The new technology could lead to the adoption of MRI as a first-line method of assessing coronary artery disease, improve high-resolution brain mapping, and implement low-cost dental MRI as a potential non-ionizing-radiation alternative to x-rays." Dr. Benjamin Shapiro, a team member from University of Maryland's Fischell Department of Bioengineering, has proposed using the high gradients with magnetic nanoparticles to improve image-guided minimally-invasive therapy.  

The landmark study, funded by the National Institute of Neurological Disorders and Stroke and the National Heart Lung and Blood Institute, challenges decades of conventional
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SOURCE Weinberg Medical Physics LLC
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