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Meet Phannie, NIST's standard 'phantom' for calibrating MRI machines
Date:5/12/2010

Magnetic resonance imaging (MRI)a widely used medical tool that relies on magnetic fields and radio waves to visualize the body's internal structures, especially soft tissuesmay soon become even more useful.

The National Institute of Standards and Technology (NIST) has unveiled the first "phantom" for calibrating MRI machines that is traceable to standardized values. The prototype, named Phannie, was developed in collaboration with the standards committee of the International Society for Magnetic Resonance in Medicine (ISMRM).

Traceable MRI calibrations are expected to enable accurate, quantitative measurements of tumors and other disease markers that can be reproduced across many different patients, scanners and clinics over timeand potentially reduce medical costs.

Displayed at the annual ISMRM meeting this past week,* the NIST phantom is a plastic sphere about the size of a person's head, filled with water-bathed grids of 100 small plastic spheres containing various salt solutions that become magnetized in a magnetic field. By making MRI scans of Phannie, users can evaluate the image contrast, resolution, and accuracy of distance and volume measurements. A machine's performance can be compared to standards, to other MRI machines, and to itself over time.

MRI scanner performance may drift, or different machines may produce different images of the same patient. The new phantom is intended to help generate more accurate and consistent images, help validate disease mechanisms and treatments, and reduce medical costs by improving image quality and reliability. The phantom will assist multisite clinical trials that use quantitative MRI to test the efficacy of novel drugs.

A number of specialized MRI phantoms already exist; the need for new ones to support quantitative studies was recognized at a NIST workshop in 2006.** NIST's is the first phantom designed to ensure that MRI system properties and image data
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Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

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Meet Phannie, NIST's standard 'phantom' for calibrating MRI machines
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