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You are here: Home / Articles / Experts Debate Merits of Peripheral MRI in Diagnosing RA

Experts Debate Merits of Peripheral MRI in Diagnosing RA

November 1, 2008 • By Greg Lavine

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Magnetic resonance imaging (MRI) procedures have opened new windows into examining joints, but questions remain about the added value of these images in routine rheumatology practice. A session at the ACR/ARHP Annual Scientific Meeting in Boston last November focused on how results obtained from peripheral, or extremity, MRI devices should guide early intervention in rheumatoid arthritis (RA) when considering the use of biologics.

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“You can’t help but be struck by the accuracy, by the beautiful nature of the pictures we have all come to recognize,” said Arthur Kavanaugh, MD, professor of medicine at the University of California, San Diego School of Medicine in La Jolla, Calif., referring to MRI-produced images.

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The most established technique for rheumatologists to visualize joints remains the traditional x-ray, which is still the gold standard for diagnosing and staging RA, said Dr. Kavanaugh, who moderated the session. As the option for using MRI has started to enter the field of rheumatology, most experts agree that the new images show much more detail than x-rays.

Good—but Good Enough?

The question facing rheumatologists is whether this added level of sensitivity moves diagnosis or treatment of RA patients forward enough. Dr. Kavanaugh wondered whether these new details provide insights that could not be found using the existing array of available tools.

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One drawback for MRI images, including peripheral and full-body devices, is the lack of an accepted scoring system to assess what is being seen. For x-rays as well as CT scans, there are established and widely used scoring systems to determine the extent of bone erosion and other related RA problems.

Traditional x-rays are often preferred when looking into potentially damaged joints because the procedure is widely available, easy to perform, well tolerated by patients, and relatively inexpensive. Full-body MRI procedures are less available and more expensive, and some patients feel uncomfortable lying in an enclosed space.

Peripheral MRIs offer potential solutions to some of these challenges. The portable nature of the technique means it can be placed on the target joints, which many patients prefer to having to lay in a full MRI machine. The peripheral MRI machines are priced so that individual practices could purchase them, making them potentially widely available.

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But experts, including an ACR Extremity MRI Task Force that examined the merits of these portable devices, still have questions.

While the full MRIs produce high magnetic fields, many as high as 3 Teslas, the peripheral versions produce low fields, some as small as 0.2 Teslas.

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Filed Under: Conditions, Guidelines, Practice Management, Rheumatoid Arthritis Tagged With: MRI, Peripheral MRI, Practice Management, RA, Rheumatoid arthritisIssue: November 2008

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