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Orientation resolution criterion. The solid black outline is a schematic representation of the en face view of an instrument tip with radius r. The red and blue lines represent orthogonal iOCT scan beams with length 2L. For a maximum iOCT scan length of 10 mm and a 40 G instrument tip, δθ is ~0.9°. x-, y-, and z-axes denote B-scan, C-scan, and A-scan directions, respectively.
