24 January 2004 Scanned beam medical imager
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Proceedings Volume 5348, MOEMS Display and Imaging Systems II; (2004) https://doi.org/10.1117/12.524602
Event: Micromachining and Microfabrication, 2004, San Jose, California, United States
Abstract
We report on a conceptual design and feasibility demonstration for a scanned beam endoscope, with advantages over present CCD imaging technology in image resolution and quality, light source power, and package diameter. Theoretical calculations were made by optical modeling and finite element analysis of the performance projected for a design meeting size constraints. To verify the design target of 5 mm for the endoscope diameter, we conducted a design study of the deformation and resolution characteristics of a scan mirror small enough to fit within a 2.5 mm capsule within the endoscope. The results show that performance similar to the test system can be achieved. A functional prototype was then built and tested to validate the theory used. The test system consisted of a photonics module with red (635 nm), green (532 nm) and blue (473 nm) lasers, combined by dichroic mirrors and launched to a single mode fiber. The light emerging from the fiber is formed into a beam and reflected from a commercially available bi-axial MEMS scanner with a 1.56 mm square mirror, and a scan angle of 6 degrees zero to peak mechanical, at a frequency of 19.7 kHz. Scanned beam power from 1 to 3 mw impinges the test object at a range from 10 to 100 mm, and the scattered light is collected by several 3 mm diameter multimode fibers and conducted one-meter to detectors. The detected light was digitized and then reconstructed to form an image of the test object, with 800 by 600 output pixels. Several such images will be presented.
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John R. Lewis, Mark Holton, Martin Kykta, Amjad Malik, Frank Metting, Chris Ryerson, Chris Wiklof, Jianhua Xu, "Scanned beam medical imager", Proc. SPIE 5348, MOEMS Display and Imaging Systems II, (24 January 2004); doi: 10.1117/12.524602; https://doi.org/10.1117/12.524602
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