Comput. Biol. Med. - Breast peripheral area correction in digital mammograms.

Tópicos

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Resumo

Digital mammograms may present an overexposed area in the peripheral part of the breast, which is visually shown as a darker area with lower contrast. This has a direct impact on image quality and affects image visualisation and assessment. This paper presents an automatic method to enhance the overexposed peripheral breast area providing a more homogeneous and improved view of the whole mammogram. The method automatically restores the overexposed area by equalising the image using information from the intensity of non-overexposed neighbour pixels. The correction is based on a multiplicative model and on the computation of the distance map from the breast boundary. A total of 334 digital mammograms were used for evaluation. Mammograms before and after enhancement were evaluated by an expert using visual comparison. In 90.42% of the cases, the enhancement obtained improved visualisation compared to the original image in terms of contrast and detail. Moreover, results show that lesions found in the peripheral area after enhancement presented a more homogeneous intensity distribution. Hence, peripheral enhancement is shown to improve visualisation and will play a role in further development of CAD systems in mammography.

Resumo Limpo

digit mammogram may present overexpos area peripher part breast visual shown darker area lower contrast direct impact imag qualiti affect imag visualis assess paper present automat method enhanc overexpos peripher breast area provid homogen improv view whole mammogram method automat restor overexpos area equalis imag use inform intens nonoverexpos neighbour pixel correct base multipl model comput distanc map breast boundari total digit mammogram use evalu mammogram enhanc evalu expert use visual comparison case enhanc obtain improv visualis compar origin imag term contrast detail moreov result show lesion found peripher area enhanc present homogen intens distribut henc peripher enhanc shown improv visualis will play role develop cad system mammographi

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