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Radiology, Vol 190, 347-352, Copyright © 1994 by Radiological Society of North America
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RB Kaufmann, PF Sheedy 2nd, JF Breen, JR Kelzenberg, BL Kruger, RS Schwartz and PP Moll
Department of Epidemiology, University of Michigan, Ann Arbor.
PURPOSE: To assess interobserver and intraobserver reliability of three quantitative measures of coronary artery calcium burden: calcium "score," number of calcified lesions, and calcified area. MATERIALS AND METHODS: Electron beam computed tomographic (CT) scanning was used in a series of 25 patients to detect coronary artery calcification. Scan results were reviewed for quality by a radiologist, then scored by two radiologic technologists and by another radiologist. RESULTS: Many interobserver and intraobserver disagreements were noted on a lesion-by- lesion basis. Since most disagreements involved very small lesions, however, their impact was negligible for all three measures of calcium burden. CONCLUSION: It is not useful for more than one observer to independently score a single CT examination obtained to detect cardiac calcification, even when the arteries are heavily calcified.
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