Figure 3: Two examples of how interpolation between B-scans
results in inaccurate macular thickness maps. (a) Undersampled
thickness maps from a single normal subject and one with
dominant drusen retain relatively similar qualitative appearance
to that of their respective 128 B-scan maps. (b) The thickness
differences between the standard of 128 scans and each
sequential level of B-scan density show the areas of the macula
most effected by undersampling in a normal subject and a subject
with dominant drusen. Even with 32 B-scans significant error is
generated through the central fovea (where the contour is
changing most rapidly) in a normal subject. This effect is
greatly enhanced in the subject with drusen wherein error is
generated not only in the central fovea but also broadly across
the entire scanning area.