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Interobserver variability in the measurement of abdominal aortic calcification using unenhanced CT

¹ Department of Radiology, University of Cambridge School of Clinical Medicine and ² Clinical Pharmacology Unit, Addenbrooke's Hospital, Box 111, Hills Road, Cambridge CB2 2SP, UK

View larger version (50K): [in this window] [in a new window]   Figure 1. Axial CT images(a) before and (b) after selection of volumes of interest.

View larger version (13K): [in this window] [in a new window]   Figure 2. Plot of Observer 1 data against Observer 2 data for each subject. The line of equality is also shown and illustrates the minimum variation in results between observers.

View larger version (11K): [in this window] [in a new window]   Figure 3. Bland–Altman plot of the difference in calcification volume against the mean for each subject, as measured by two independent observers. SD, standard deviation.