Visibility Map: A New Method in Evaluation Quality of Optical Colonoscopy
Optical colonoscopy is performed by insertion of a long flexible endoscope into the colon. Inspecting the whole colonic surface for abnormalities has been a main concern in estimating quality of a colonoscopy procedure. In this paper we aim to estimate ar
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Department of Computer Science, University of Canberra, Australia [email protected] 2 CSIRO Digital Productivity Flagship, Australia [email protected] 3 Department of Gastroenterology and Hepatology, Royal Brisbane and Women’s Hospital
Abstract. Optical colonoscopy is performed by insertion of a long flexible endoscope into the colon. Inspecting the whole colonic surface for abnormalities has been a main concern in estimating quality of a colonoscopy procedure. In this paper we aim to estimate areas that have not been inspected thoroughly as a quality metric by generating a visibility map of the colon surface. The colon was modeled as a cylinder. By estimating the camera motion parameters between each consecutive frame, circumferential bands from the cylinder of the colon surface were extracted. Registering these extracted band images from adjacent video frames provide a visibility map, which could reveal uncovered areas by clinicians from colonoscopy videos. The method was validated using a set of realistic videos generated using a colonoscopy simulator for which the ground truth was known, and by analyzing results from processing actual colonoscopy videos by a clinical expert. Our method was able to identify 100% of uncovered areas on simulated data and achieved with sensitivity of 96% and precision of 74% on real videos. The results suggest that visibility map can increase clinicians’ awareness of uncovered areas, and would reduce the chance of missed polyps. Keywords: Optical colonoscopy, Visibility map, Colonoscopy Quality, Uncovered area, Camera motion parameters.
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Introduction
Colorectal or Bowel cancer is the second cause of cancer related death after lung cancer, in Australia and the Western world [1]. Early diagnosis of bowel cancer can increase the chance of survival for patients by up to 90%. Colonoscopy is the gold standard method for detection and removal of colonic polyps. The efficiency of a colonoscopy procedure is influenced by many factors, including the amount of the colon surface that is inspected for the presence of polyps by the clinician. Studies have reported that even experienced gastroenterologists can still miss up to 33% of polyps [2, 3]. This is in part due to polyps, in particular flat lesions such as sessile serrated adenomas, not being recognized even though they are in view, but also due to polyps not being viewed because they were never inspected by the camera. © Springer International Publishing Switzerland 2015 N. Navab et al. (Eds.): MICCAI 2015, Part I, LNCS 9349, pp. 396–404, 2015. DOI: 10.1007/978-3-319-24553-9_49
Visibility Map: A New w Method in Evaluation Quality of Optical Colonoscopy
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One way to address thiss problem is to increase clinicians’ skills through trainiing; another way is to provide assistance a to clinicians during the intervention by develloping assistive technologies. There T are several techniques which can measure the quaality of a colonoscopy inspectio on by metrics such as withdrawal time [4], number off informative frames [5], an
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