Abstract
Wireless Capsule Endoscopy (WCE) is a non-invasive medical procedure devised for painless in vivo inspection of the gastrointestinal (GI) tract. It is especially valuable for the examination of the small intestine since it is difficult to reach by traditional endoscopic procedures. The setup includes a camera with an embedded light source and a circuit capable of acquiring and transmitting the video. The main challenge of this technology is the identification of the position and trajectory of the capsule as it travels through the GI tract, which is particularly relevant during the detection of anomalies in the tissue. Given only the information provided by the recorded images, it is possible to estimate the 3D motion of the camera capsule and provide a full trajectory reconstruction. A critical yet difficult step in this process is the image registration between sequential frames. Therefore, being able to determine accurate correspondences between points, regions or features in two consecutive frames is crucial for the computation of the relative rotation and translation of the capsule. This paper comprises a comparative assessment of methodologies to address this problem with a porcine colon dataset obtained with our experimental setup.
Highlights
E NDOSCOPIC capsules are currently used for a variety of medical exams for the inspection of the full length of the GI tract and constitute a non-invasive approach without the risks involved with the sedation process and the risk of perforation from standard endoscopes
A few selected point matches obtained with each registration method (MEIR, MPIR, Scale-Invariant Feature Transform (SIFT), Speeded Up Robust Features (SURF), Maximally Stable Extremal Regions (MSER), and Local Intensity Order Pattern (LIOP)) in the first pair of consecutive frames from the experimental dataset, is compiled in Figure 5 along with the manually annotated matches for visual comparison
One of the main challenges of Wireless Capsule Endoscopy (WCE) technology is the identification of the location and the trajectory of the capsule as it moves through the GI tract, which is especially relevant for the detection of anomalies
Summary
E NDOSCOPIC capsules are currently used for a variety of medical exams for the inspection of the full length of the GI tract and constitute a non-invasive approach without the risks involved with the sedation process and the risk of perforation from standard endoscopes. This is a very attractive gastroenterology alternative exam that is especially relevant for patients who require repeated inspection at regular intervals [1] and for the examination of the small intestine which is not reached with other conventional endoscopic procedures [2]. These images are inspected by a clinician to identify and locate possible lesions such as polyps and ulcers [2]
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