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28 July 1994 Quantitative size measurement of features viewed through a video endoscope
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Proceedings Volume 2131, Biomedical Fiber Optic Instrumentation; (1994)
Event: OE/LASE '94, 1994, Los Angeles, CA, United States
Quantitative size measurements of gastrointestinal tract lesions (i.e., ulcers and polyps) viewed during endoscopy are helpful in assessing the rate of healing or growth. We report a novel technique for quantitatively measuring the two-dimensional size of a feature viewed remotely via a video imager. Our instrument's small size makes it a suitable candidate for use in endoscopes. Computing the size of a feature displayed on a two-dimensional video monitor necessitates measuring the distance between the imager and the surface under observation because an undistorted video image preserves the angular content of a scene. We have developed a prototype ranging system that exploits the tendency of light emerging from the tip of an optical fiber to diverge. Our device uses two fibers with different divergence characteristics. The separation between the imaging sensor and the viewed surface is determined by inspecting the relative sizes of the spots cast by each of the fibers. Our device, which measures distances between 2 and 8 cm, is sufficiently small to be accommodated in an endoscope's accessory channel.
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Vipul Bhatnagar, Jay C. Poret, Joseph J. Suter, William J. Ravich, and Judith A. Giannini "Quantitative size measurement of features viewed through a video endoscope", Proc. SPIE 2131, Biomedical Fiber Optic Instrumentation, (28 July 1994);

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