University PhD Dissertation Defense: Toward a Flexible Multimode Fiber Endoscope , Ruo Yu Gu, Advisor: Joseph M. Kahn

University PhD Dissertation Defense<br><br>Title:&nbsp;Toward a Flexible Multimode Fiber Endoscope&nbsp;&nbsp;<br>Speaker: Ruo Yu Gu, Advisor: Joseph M. Kahn<br>Date: December 1, 2018<br>Time: 2:00pm<br>Location: Packard 101<br><br>Abstract:&nbsp;<br>Small diameter and high resolution are the most important attributes of medical endoscopes that are used for imaging through very narrow passageways. In the past six years, a new class of thin endoscope has been devised which use a single multimode fiber (MMF) as the optical conduit to transmit images. These MMF endoscopes offer a better trade-off between diameter and spatial resolution than current commercial thin endoscopes, which are made using fused bundles of single mode fibers (SMF). For example, a typical MMF endoscope with 0.5 mm diameter would resolve more than half a million pixels, compared to thousands of pixels for the same diameter fused SMF bundle endoscope. However, as with any other new technology, both challenges and questions remain before this technology will be commercially ready.<br> <p align="justify">In this talk, I will first describe the state of the art for rigid MMF endoscopes: their applications in medical imaging; the theory of their operation and how scrambling of light through a MMF can be overcome; their maximum theoretical resolution, signal-to-noise ratio, and why rigidity is enforced; and areas of active research. In the second part, I will describe the state of the art for flexible MMF endoscopes: their applications in medical imaging; a design that uses a partial reflector to measure and compensate for MMF bending; experimental verification and results; and remaining obstacles and areas of active research.</p>

Friday, December 1, 2017 - 2:00pm to 3:00pm
David Packard Electrical Engineering, 350 Serra Mall, Stanford, CA 94305, USA