Abstract
We introduce photometric stereo reconstruction for surface analysis of mucosal tissue. Photometric stereo captures images of a surface from a single camera, but illuminated from different light sources. From the set of images, a detailed surface reconstruction is estimated. We apply photometric stereo principles to mucosal tissue, which raises technical challenges due to its specular appearance. Following reconstruction of the surface, we apply surface analysis techniques based on differential geometry to detect regions that are locally spherical, suggestive of polyps. The research described in this paper is a first step towards a real-time clinical support system based on 3D reconstruction of human tissue for gastereoentrologic applications such as colonoscopy.
Highlights
High levels of recurrence and residual tissue have been reported following piecemeal endoscopic resection of large colorectal polyps with figures approaching 30% described.[1]
94.9 yes Conclusion Caecal location was associated with over a 5-fold increase (28.7% vs 5.1%) in the incidence of 12 month recurrence. The results from this series confirm the increased technical demands associated with the endoscopic resection of caecal LNPCPs, especially considering our study involved experienced Bowel Cancer Screening Programme (BCSP) endoscopists
A lower level of recurrence was seen in the argon plasma coagulation (APC) group compared with the non APC group (17.9% vs 31.4%), with statistical significance seen on 1-sided but not 2sided chi square analysis (p = 0.042 (1-sided), p = 0.064 (2sided))
Summary
This study shows that it is important to document the RS at the time of first presentation of AUGIB rather than at the time when the patient is seen by the admitting doctor. This study does not show a direct correlation between the RS and endoscopic intervention. It emphasises the fact that all doctors should be educated about the importance of documenting the correct RS as more than three quarter of the RS on request forms were found to be inaccurate. DURING ENDOSCOPIC RETROGRADE CHOLANGIO PANCREATOGRAPHY (ERCP): A SINGLE CENTRE EXPERIENCE
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