Interobserver agreement in the assessment of cerebral atrophy on CT using bicaudate and sylvian-fissure ratios

To assess the interobserver variability of cerebral-atrophy measures on CT, three investigators measured the bicaudate ratio (BCR) and the sylvian-fis sure ratio (SFR) on 20 CT studies of patients with ischaemic stroke. The in traclass correlation coefficient of BCR measurements was 0.82 [95% confiden ce interval (CI) 0.75-0,94], and that of SFR measurements 0.69 (95% CI 0.57 -0.89). The range of pairwise-calculated Pearson correlation coefficients w as smaller for measurement of the BCR (0.89-0.92) than for the SFR measurem ents (0.66-0.84).