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(a) Sensitivity roll-off measured using the 500 MSPS A/D card, (b) sensitivity roll-off measured using the 1 GHz oscilloscope, and (c) point spread function of the ultrahigh speed endoscopic OCT system. The point spread function was measured at imaging depth of ~1.1 mm and has 11 μm axial resolution, corresponding to 8 μm in tissue.
