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NIST calibration tools to encourage use of novel medical imaging technique
Date:12/6/2013

The National Institute of Standards and Technology (NIST) has developed prototype calibration tools for an experimental medical imaging technique that offers new advantages in diagnosing and monitoring of certain cancers and possibly other medical conditions.*

NIST designed, constructed and tested two prototype phantoms for calibrating ultralow-field (ULF) magnetic resonance imaging (MRI) systems. Phantoms are widely used tools for quality control in medical imaging. They are generally objects with simple shapes but very well-defined responses to a specific type of imaging scanner. As their name implies, phantoms are stand-ins for the body, and are used to help optimize MRI machines to deliver the best possible medical images for a given type of tissue.

The NIST prototypes are the first standard calibration tools for ULF-MRI, offering a quantitative means to assess performance, validate the technique, and directly compare different experimental and clinical MRI scanners.

"Tissues that may look the same in clinical MRI can look very different in ULF-MRI, which provides new contrast mechanisms," NIST physicist Michael Boss says. "Our hope is that we can move this technique along to attract more interest from [industry] vendors."

MRI noninvasively images soft tissues based on measurements of how hydrogen nucleiin the water that makes up much of the bodyrespond to magnetic fields. ULF-MRI enhances tissue contrast in particular types of MRI scans. Prostate tumors, for example, can be difficult to see with conventional MRI but show up clearly under ULF-MRI. ULF-MRI has also been used experimentally to image the brain, and tested in at least one nonmedical application, inspection of liquids at airports.

ULF-MRI also offers practical advantages: The instruments are simpler in design, lighter in weight and less expensive than regular MRI scanners. That's because ULF-MRI operates at much lower magnetic field strengths, mea
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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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