Design of Image Integrated Circuits for Gastrointestinal Tract Capsule Endoscopy
|關鍵字:||膠囊內視鏡;影像感測器;窄波段影像;腸胃道;Capsule Endoscope;Image Sensor;Narrowband Imaging;Gastrointestinal Tract|
This dissertation designed a high resolution low-power 512-by-512 image sensor whose light intensity can respond to all altering requirements for capsule endoscope. In addition, endoscope combined with narrow-band image (NBI) has been shown to be a superior diagnostic tool for early stage tissue neoplasms detection. However, there is no NBI technology being applied for the wireless capsule endoscope. This dissertation presented a dual-mode capsule gastrointestinal endoscope device. The first narrow-band imaging capsule endoscope that can assist clinic doctors to effectively diagnose early gastrointestinal cancers, profited from the dedicated dual-mode CMOS sensor which can offer both white-light and narrow-band images. Besides, viewing and evaluating all captured video are time-consuming task for MD gastroenterologists. In addition to the relatively large capacity of data associated with captured images, specific challenge to capsule endoscopy include effective illumination of the region to be imaged. This dissertation presented a 360-degree side-view capsule endoscope, that features both image acquisition and image stitch. The proposed video capsule can capture complete images of the intestine wall without loosing any intestinal features which are caused by field of view or wrinkled intestine. A preliminary feature point based image stitch algorithm is also presented to reconstruct unwarped 2-D and 3-D representations of whole small intestine. Moreover, standard endoscopy are incapable to investigate the entire small bowel and are very expensive. Hence, a detachable two-mode endoscope for gastrointestinal examination is presented. The proposed detachable endoscope can explore the whole digestive tract in one examination based on a re-designed capsule endoscope and conventional endoscope technology. Finally, a dedicated low power imaging and transmitting ASIC is developed for capsule endoscope in order to reduce the PCB area, on-board components, costs, and power.
|Appears in Collections:||Thesis|