Display method can affect interobserver agreement: comparison of ‘zoom-and-pan’ and ‘browse-and-paste’ for primary CT interpretation

Eight radiologists interpreted body CT images of 30 cases using a viewing station (six 17-in. monitors, 1024×1280). Using two different display methods, ‘zoom-and-pan’ and ‘browse-and-paste’, the readers described the presence or absence of liver tumors using a five-point rating scale and temporal changes between the current and previous studies using a seven-point rating scale. There was no significant difference in kappa values for tumor detection between the two display modes. However, in describing temporal changes, the kappa value of the browse-and-paste was significantly lower than that of zoom-and-pan ( p