Comput Methods Programs Biomed - Virtual colon flattening method based on colonic outer surface.

Tópicos

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Resumo

Virtual colon flattening (VF) is a minimally invasive viewing mode used to detect colorectal polyps on the colonic inner surface in virtual colonoscopy. Compared with conventional colonoscopy, inspecting a flattened colonic inner surface is faster and results in fewer uninspected regions. Unfortunately, the deformation distortions of flattened colonic inner surface impede the performance of VF. Conventionally, the deformation distortions can be corrected by using the colonic inner surface. However, colonic curvatures and haustral folds make correcting deformation distortions using only the colonic inner surface difficult. Therefore, we propose a VF method that is based on the colonic outer surface. The proposed method includes two novel algorithms, namely, the colonic outer surface extraction algorithm and the colonic outer surface-based distortion correction algorithm. Sixty scans involving 77 annotated polyps were used for the validation. The flattened colons were independently inspected by three operators and then compared with three existing VF methods. The correct detection rates of the proposed method and the three existing methods were 79.6%, 67.1%, 71.9%, and 72.7%, respectively, and the false positives per scan were 0.16, 0.32, 0.21, and 0.26, respectively. The experimental results demonstrate that our proposed method has better performance than existing methods that are based on the colonic inner surface.

Resumo Limpo

virtual colon flatten vf minim invas view mode use detect colorect polyp colon inner surfac virtual colonoscopi compar convent colonoscopi inspect flatten colon inner surfac faster result fewer uninspect region unfortun deform distort flatten colon inner surfac imped perform vf convent deform distort can correct use colon inner surfac howev colon curvatur haustral fold make correct deform distort use colon inner surfac difficult therefor propos vf method base colon outer surfac propos method includ two novel algorithm name colon outer surfac extract algorithm colon outer surfacebas distort correct algorithm sixti scan involv annot polyp use valid flatten colon independ inspect three oper compar three exist vf method correct detect rate propos method three exist method respect fals posit per scan respect experiment result demonstr propos method better perform exist method base colon inner surfac

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