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University School of Medicine, Atlanta, GA (Dr. Davis)
Duke University Medical Center, Durham, NC (Drs. Gray, Wilkinson, and Heyman)
Harvard Medical School, Boston, MA (Dr. Albert)
University of Washington, Seattle, WA (J. Hughes)
Washington University School of Medicine, St. Louis, MO (Drs. Gado and Kido)
Johns Hopkins University, Baltimore, MD (Dr. Kumar)
LA County/USC Medical Center, Los Angeles, CA (Dr. Destian)
AB Chandler Medical Center, Lexington, KY (Dr. Lee)
University of Alabama Hospital, Birmingham, AL (Dr. Duvall)
Veterans Administration Medical Center (Minneapolis), Minneapolis, MN (Dr. Nelson)
Montefiore Medical Center, Bronx, NY (Dr. Bello)
Veterans Administration Medical Center (Houston), Houston, TX (Dr. Weathers)
Brigham and Women's Hospital, Boston, MA (Drs. Jolesz and Kikinis)
Graduate Hospital, Philadelphia, PA (Dr. Brooks).
The Consortium to Establish a Registry for Alzheimer's Disease (CERAD) has developed procedures for standardized imaging and reporting of magnetic resonance (MR) findings in Alzheimer's disease (AD) for use by neuroradiologists in multiple medical centers using a variety of MR equipment and field strengths. After initial pretesting, we revised the protocol, expanded the summary rating scale to seven points, and added more illustrations. Fourteen participating neuroradiologists evaluated 28 MR scans of elderly patients, giving us the basis for judging interrater agreement. We obtained acceptable intraclass correlations (>0.79) for rating the size of the lateral and third ventricles and the temporal horn. Less satisfactory intraclass correlations occurred when rating other areas, including (1) global atrophy of the brain (0.70); (2) dilatation of the sulci of the temporal lobe (0.66); (3) frequency, location, and severity of white matter lesions (0.77); (4) sylvian fissure enlargement (0.70); and (5) cerebral sulcal dilatation (0.64). We also saw considerable variation in the reporting of cortical and lacunar infarcts. Despite careful design of the rating methodology and readings by experienced neuroradiologists, we did not find satisfactory interrater agreement for interpreting MR findings in elderly subjects. These findings may explain the difficulties encountered in applying similar subjective rating techniques that meet with success at one institution to multicenter studies. More objective and reproducible procedures are needed for interpretation of neuroimaging findings of AD in multicenter studies.
Supported by NIA grant AG06790.
Presented in part at the 43rd annual meeting of the American Academy of Neurology, Boston, MA, April 1991.
Received October 25, 1991. Accepted for publication in final form February 13, 1992.
Address correspondence and reprint requests to Dr. P.C. Davis, Department of Radiology/MRI, Egleston Children's Hospital, Emory University, 1405 Clifton Road, NE, Atlanta, GA 30322. Requests for information about CERAD and its copyrighted assessment batteries should be directed to Albert Heyman, MD, Duke University Medical Center, Box 3203, Durham, NC 27710.
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