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Forward-viewing spectrally encoded endoscopy with angled detection optics (Conference Presentation)
Author(s): Adel Zeidan; Dukho Do; DongKyun Kang; Mitsuhiro Ikuta; Guillermo J. Tearney

Paper Abstract

Utilizing spatial wavelength encoding, spectrally encoded endoscopy (SEE) makes it possible to create miniature, small diameter endoscopic probes that can allow easy access to hard-to-reach locations within the body. Previously described SEE probes have been side-viewing, which limits their use for guiding the navigation of narrow passages. Forward-viewing SEE probes are advantageous as they provide a look ahead that facilitates navigation and surveillance of a wider field of view. In this work, we present a novel forward-viewing SEE probe. The 500-µm illumination optics are designed in such a way that the shortest wavelength (460 nm) propagates along the optical axis, while an angle of approximately 56° is formed between the longest wavelength (720 nm) and the optical axis. Two-dimensional illumination was accomplished by rotating the illumination optics at a speed of 15 rps using a miniature torque coil. Reflected light from the sample was collected by 8 multimode detection fibers that were arranged into a circular array around the illumination optics. The proximal ends of the detection fibers were polished at a 17° angle, resulting in a total angle of detection of approximately 100°. Light coming out from the distal end of the detection fibers, which were rearranged into a linear array, was detected using a custom spectrometer with a tall-pixel linear CCD camera. Similar to the theoretical value, an effective FOV of 23 mm at a focal distance of 10 mm was measured by imaging a grid pattern. Preliminary results demonstrate the potential of the forward-viewing SEE probe for a variety of medical imaging applications.

Paper Details

Date Published: 14 March 2018
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Proc. SPIE 10470, Endoscopic Microscopy XIII, 104700S (14 March 2018); doi: 10.1117/12.2285202
Show Author Affiliations
Adel Zeidan, Harvard Medical School (United States)
Wellman Ctr. for Photomedicine, Massachusetts General Hospital (United States)
Dukho Do, Harvard Medical School (United States)
Wellman Ctr. for Photomedicine, Massachusetts General Hospital (United States)
DongKyun Kang, Harvard Medical School (United States)
Wellman Ctr. for Photomedicine, Massachusetts General Hospital (United States)
Mitsuhiro Ikuta, Canon U.S.A., Inc. (United States)
Wellman Ctr. for Photomedicine, Massachusetts General Hospital (United States)
Guillermo J. Tearney, Harvard Medical School (United States)
Wellman Ctr. for Photomedicine, Massachusetts General Hospital (United States)


Published in SPIE Proceedings Vol. 10470:
Endoscopic Microscopy XIII
Guillermo J. Tearney; Thomas D. Wang; Melissa J. Suter, Editor(s)

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