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Lateral resolution calibration with a USAF1951 target. (a) An averaged en face image generated from a 3-D OCT volume by extracting the orthogonal slices with respect to the depth direction. The inset shows a zoom-in view of groups 6 and 7. The last group with distinguishable line group (group 6-4) is highlighted in the yellow box. (b) The averaged pixel profiles extracted across the horizontal (blue dashed line) and vertical (red solid line) bars of group 6-4.
