Fig. 4.

Scanner Effects across Field and Manufacturer. Each vertical line represents the distribution of normalized thickness and volume features for a single image; the region within one standard deviation of the image-specific mean is shaded darker. Horizontal lines show the means and 1 standard deviation intervals of normalized feature means for each scanner strength/manufacturer combination. Covariate effects are regressed out before plotting. Distribution distances across field strength and manufacturer are partially but not completely removed by both EB ComBat and FB ComBat.