By Haishan Zeng
Combining a qualified improvement direction on diagnostic endoscopy from SPIE (the foreign society advancing light-based examine) and the authors’ graduate direction on biomedical optics, this paintings is written for researchers in scientific optics and biomedical engineering in addition to graduate clinical optics scholars. It makes use of large examples/case reviews to familiarize readers with the basics of endoscopic optics, the professionals and cons of white mild endoscopy and fluorescence endoscopy for diagnostic purposes, and diverse microscopic endoscopy imaging modalities. It covers simple optics, info of layout and biomedical makes use of, in addition to microscopic endoscopy, and endoscopic spectroscopy.
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Current applications of capsule endoscopes are solely for the digestive tract, especially for the small intestine, which cannot be fully accessed by traditional endoscopes. 12 Schematics of a wireless capsule endoscope. minutes. For the colon, it takes images at 4 frames/sec for a total period of about 3 hours. For the small intestine, images are acquired at 2 frames/sec for 8 hours due to the slow and long journey (20–25 feet) of the capsule. The device was found to be clinically useful for the detection of GI bleeding, Crohn’s disease, celiac disease, and small bowel tumors.
In the case of video endoscope, images are captured by placing a miniaturized CCD sensor directly after the objective, eliminating the uses of image relay optics and the eyepiece. 10 illustrates the imaging optics involved in a fiber optic endoscope. Object QP on the tissue surface is imaged by the objective to form an image Q′P′ at the entry-face of the distal end of the coherent fiber bundle. 10 Image formation and relay in a fiber optic endoscope. containing several hundred thousand fibers, relays the image to the proximal endface of the bundle to form an image Q″P″.