Comput Methods Programs Biomed - Transformation of videocapsule images to detect small bowel mucosal differences in celiac versus control patients.


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CKGROUND: Videocapsule endoscopy can be useful to detect small intestinal pathology in celiac disease patients. However, presence of extraneous features including air bubbles and opaque fluids can complicate the analysis. A technique for quantitative analysis of videocapsule images is presented that is robust to presence of extraneous features.METHOD: Videocapsule clips were acquired from five small intestinal locations in 12 celiacs with villous atrophy and 11 control patients. Clips were 200 frames in length, their resolution was 576 ? 576 pixels and 256 grayscale levels, with 2/s frame rate. The dominant period (DP), defined as the tallest peak in the ensemble average power spectrum, was computed over each clip without removal of extraneous features. Ensemble average basis images were constructed, and measurements were made of their frame-to-frame variation in brightness and texture.RESULTS: From pooled basis images, celiac images had greater texture than controls and exhibited more brightness variation (p<0.05 in mean and p<0.01 in standard deviation). In celiacs, correlation existed between greater textural alterations versus longer DP (r?=0.47), and between greater brightness variation and longer DP (r?=0.33). There was no significant correlation between quantitative features and DP in controls (r?<0.25).CONCLUSIONS: Using this new method, celiac videoclips were quantitatively distinguishable from control videoclips without manual or computer-assisted detection, masking, and removal of extraneous image features. Furthermore, in celiac but not control basis images, larger textural and brightness alterations were correlated to longer DP. Greater textural and brightness alterations, and thus longer periodicities, are likely related to presence of villous atrophy.

Resumo Limpo

ckground videocapsul endoscopi can use detect small intestin patholog celiac diseas patient howev presenc extran featur includ air bubbl opaqu fluid can complic analysi techniqu quantit analysi videocapsul imag present robust presenc extran featuresmethod videocapsul clip acquir five small intestin locat celiac villous atrophi control patient clip frame length resolut pixel grayscal level s frame rate domin period dp defin tallest peak ensembl averag power spectrum comput clip without remov extran featur ensembl averag basi imag construct measur made frametofram variat bright textureresult pool basi imag celiac imag greater textur control exhibit bright variat p mean p standard deviat celiac correl exist greater textur alter versus longer dp r greater bright variat longer dp r signific correl quantit featur dp control rconclus use new method celiac videoclip quantit distinguish control videoclip without manual computerassist detect mask remov extran imag featur furthermor celiac control basi imag larger textur bright alter correl longer dp greater textur bright alter thus longer period like relat presenc villous atrophi

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