Automated method and system for improved computerized...

G - Physics – 06 – T

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G06T 7/00 (2006.01) A61B 6/03 (2006.01) G06K 9/00 (2006.01)

Patent

CA 2177472

A method and system for automated detection and classification of masses in mammograms. This method and system include the performance of iterative, multi-level gray level thresholding (202), followed by lesion extraction (203) and feature extraction techniques (205) for classifying true masses from false-postive masses and malignant masses from benign masses. The method and system provide improvements in the detection of masses including multi-gray-level thresholding (202) of the processed images to increase sensitivity and accurate region growing and feature analysis to increase specificity. Novel improvements in the classification of masses include a cumulative edge gradient orientation histogram analysis relative to the radial angle of the pixels in question; i.e either around the margin of the mass or within or around the mass in question. The classification of the mass leads to a likelihood malignancy.

Procédé et système de détection et de classification automatisées des masses présentes dans des mammographies. Ce procédé et ce système comprennent l'exécution du seuillage (202) itératif, à niveaux de gris multiples, l'extraction (203) des lésions et des techniques (205) d'extraction de caractéristiques qui permettent de distinguer les vraies masses des fausses masses et les masses malignes des masses bénignes. Ce procédé et ce système apportent des améliorations dans la détection des masses, telles que le seuillage (202) multiniveaux du gris des images traitées pour améliorer la sensibilité et la croissance précise de la région ainsi que l'analyse des caractéristiques pour augmenter la spécificité. On peut citer à titre de nouvelles améliorations dans la classification des masses une analyse cumulative de l'histogramme à orientation gradient de bord par rapport à l'angle radial des pixels en question, c'est-à-dire soit autour du bord de la masse soit à l'intérieur ou autour de la masse en question. La classification de la masse donne une probabilité de la malignité de cette dernière.

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