| dc.description.abstract | Recently, the applications of the capsule endoscope which face the problems, including unclear image, low viewing angle, the enteric fold which is unable to be held opening completely, and the velocity of the capsule endoscope which is unable to control in alimentary canal. All of the above are difficult for doctors to check. In order to improve the disadvantages of the capsule endoscope, we offer a designed method that is simple and practical. We also establish a completed and clear omni-directional view of the small intestine to provide doctors for check.
This study tries to utilize the prospective optical method to solve the problems of the capsule endoscope. We propose an innovative way that making 360 degrees of images of the field of ring within small intestine. The images of the enteric fold’s surfaces can be taken from the sideway of the capsule endoscope without anywhere which is covered and hided by enteric folds. This study proposes that how to use a cone mirror as the reflection plane of the contact capsule endoscope. Using the annular transparent view window to observe the sideway images of alimentary canal. Most important of all, we should reduce disadvantages when we observe the dead spaces where are caused by enteric fold. In addition, the velocity of the capsule endoscope can also be obtained accurately than before. We can not only reduce the astigmatism effect of the image system which is caused by cone mirror, but also design the new double lenses for the contact capsule endoscope. The view’s field of the new double lenses can reach to 65.08 degrees. When F/#=4.2, the RMS spot radii of three fields are less than 17?m, the MTF of tangential rays improve from -7.762% to 36% at 100lp/mm, and the distortion reduce from -7.762% to -5.0595%.
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