Fig. 4.

Example images, to demonstrate the scaling errors visually inspected in the Experiments section. Image (a) is a baseline image, coronal view, and figure (b) is the 6DOF registered repeat image. The red bar is the same size in all images, and yet the enlarged section shows clear differences between (a) and (b), most visible at the end of the bar. The difference is a superior–inferior scaling issue. Images (c) and (d) show the same subject as (a) and (b) but in saggital view. Image (c) is the baseline, and (d) is the 6DOF registered repeat image.