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CT Scans Deemed Best for Checking Heart Arteries
Date:2/2/2010

But if it's muscle tissue that needs examining, use MRI, expert says

TUESDAY, Feb. 2 (HealthDay News) --When a doctor wants to assess the condition of heart arteries without putting a gadget into those blood vessels, the X-ray technology called computed tomography -- more commonly called a CT scan -- is better than magnetic resonance imaging, or MRI, a German review of studies has found.

"For ruling out coronary artery disease, CT is more accurate than MRI," researchers from Humboldt University in Berlin said in a report in the Feb. 2 issue of the Annals of Internal Medicine.

The standard method for checking heart arteries is coronary angiography, which involves threading a thin, flexible tube, called a catheter, into the heart. But doctors do not always want to run the risks that can be associated with that technique, and the leading candidates for less invasive assessment are CT and MRI.

CT is a scanning technique using X-rays that produce a set of slice-by-slice heart images, up to 16 slices, depending on the power of the machine. MRI uses a powerful magnetic field and pulses of radiowave energy to create images.

The German researchers looked at results of 109 published studies of noninvasive heart artery imaging, including 89 that used CT and 20 that used MRI and involving 8,505 people. In the studies of people with suspected coronary artery disease, CT proved to be 97 percent sensitive, compared with 87 percent sensitivity for MRI exams, the analysis found. Sensitivity rates the ability of a test to correctly identify people who have a particular disease.

"This article holds no surprises whatever," said Dr. Uwe Joseph Schoepf, a professor of radiology and cardiology at the Medical University of South Carolina. "This is really something that is sort of common trade knowledge."

Indeed, CT and MRI are not contenders in clinical practice but are used for different reasons to ma
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