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Electrostatic forward-viewing scanning probe for Doppler optical coherence tomography using a dissipative polymer catheter

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Abstract

A novel flexible scanning optical probe is constructed with a finely etched optical fiber strung through a platinum coil in the lumen of a dissipative polymer. The packaged probe is 2.2mm in diameter with a rigid length of 6mm when using a ball lens or 12mm when scanning the fiber proximal to a gradient-index (GRIN) lens. Driven by constant high voltage (13kV) at low current (<5μA), the probe oscillates to provide wide forward-viewing angle (13° and 33° with ball and GRIN lens designs, respectively) and high-frame-rate (10140fps) operation. Motion of the probe tip is observed with a high-speed camera and compared with theory. Optical coherence tomography (OCT) imaging with the probe is demonstrated with a wavelength-swept source laser. Images of an IR card as well as in vivo Doppler OCT images of a tadpole heart are presented. This optomechanical design offers a simple, inexpensive method to obtain a high-frame-rate forward-viewing scanning probe.

© 2008 Optical Society of America

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