Comput Methods Programs Biomed - Distinguishing patients with celiac disease by quantitative analysis of videocapsule endoscopy images.

Tópicos

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Resumo

CKGROUND: Although videocapsule endoscopy images are helpful in the evaluation of celiac disease, their interpretation is subjective. Quantitative disease markers could assist in determining the extent of villous atrophy and response to treatment.METHOD: Capsule endoscopy images were acquired from celiac patients with small bowel pathology (N=11) and from control patients (N=10). Image resolution was 576x576 pixels in dimension, 256 grayscale levels, and had a 2 s(-1) frame rate. Pixel brightness and image texture were measured over 10x10 pixel subimages and then averaged for 56x56 subimages per frame. Measurements were obtained at five locations from proximal to distal small intestine in each patient. At each location, measurements were calculated using 200 consecutive image frames (100s). Mean frame-to-frame pixel brightness, image texture, and periodicity in brightness, an estimate of wall motion or intestinal motility, were computed and used for classification with a nonlinear discriminant function.RESULTS: From pooled data, celiac images had greater texture than did images from control patients (p<0.001) and exhibited more frame-to-frame brightness variation as well (p=0.032). The dominant period of brightness was longer in celiacs (p=0.001), possibly indicating decreased motility. Using the markers for three-dimensional nonlinear classification of celiacs versus controls, sensitivity was 92.7% and specificity was 93.5%. The relationship between dominant period and small intestinal transit time was approximately linear for both celiacs and controls (r(2)=0.42 and r(2)=0.55, respectively).CONCLUSIONS: Videocapsule images can be quantified to detect villous atrophy throughout the small intestine, and to distinguish individuals with celiac disease from individuals lacking mucosal atrophy.

Resumo Limpo

ckground although videocapsul endoscopi imag help evalu celiac diseas interpret subject quantit diseas marker assist determin extent villous atrophi respons treatmentmethod capsul endoscopi imag acquir celiac patient small bowel patholog n control patient n imag resolut x pixel dimens grayscal level s frame rate pixel bright imag textur measur x pixel subimag averag x subimag per frame measur obtain five locat proxim distal small intestin patient locat measur calcul use consecut imag frame s mean frametofram pixel bright imag textur period bright estim wall motion intestin motil comput use classif nonlinear discrimin functionresult pool data celiac imag greater textur imag control patient p exhibit frametofram bright variat well p domin period bright longer celiac p possibl indic decreas motil use marker threedimension nonlinear classif celiac versus control sensit specif relationship domin period small intestin transit time approxim linear celiac control r r respectivelyconclus videocapsul imag can quantifi detect villous atrophi throughout small intestin distinguish individu celiac diseas individu lack mucos atrophi

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