Abstract
In this Letter, we report a compact endomicroscope () based on a fiber bundle and a two-axis piezoelectric tube scanner, achieving a resolution of and an imaging speed of 30–120 fps. Compared with distal end scanning systems, typical fiber-bundle-based endomicroscopes achieve a more compact envelope () at the expense of compromised imaging quality. The resolution of fiber-bundle-based systems is largely limited by the diameter of the constituent fibers (), where each fiber serves as a single pixel, i.e., a sampling point, in the imaging system. To retrieve the lost information, we integrate a piezo tube scanner at the tip of the fiber bundle. Next, we rapidly scan the fiber tip over a range of and combine the signals obtained at different inter-fiber locations. Direct alignment and feature-based registration methods are applied to register the raw images. Imaging experiments are performed on a resolution target and biological samples to demonstrate the performance enhancement.
© 2018 Optical Society of America
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