System and method for computer aided polyp detection

A - Human Necessities – 61 – B

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A61B 5/05 (2006.01)

Patent

CA 2612223

In the present methods, the automatic detection of polyps is converted into a 2D pattern recognition problem using conformal mapping and direct volume rendering. The colon surface is first segmented and extracted from the CT data set of the abdomen, which is then mapped to a 2D plane using conformal mapping. Ray casting is used to determine sub-surface density values and the flattened image is rendered using a volume rendering technique with a translucent electronic biopsy transfer function. Polyp candidates are detected by a clustering method which identifies regions of elevated sub-surface density. The potential for false positives is reduced by analyzing the volumetric shape and texture features of the polyp candidate regions.

Dans les procédés selon l'invention, la détection automatique de polypes est convertie en un problème de reconnaissance des formes 2D par projection conforme et rendu volumique direct. La surface du côlon est d'abord segmentée et extraite de l'ensemble de données tomographiques de l'abdomen, qui est ensuite appliqué à un plan 2D par projection conforme. Un lancer de rayon est utilisé pour déterminer les valeurs de densité de sous-surface et l'image aplatie est rendue par une technique de rendu volumique avec une fonction de transfert de biopsie électronique translucide. Les candidats polypes sont détectés par un procédé de regroupement qui identifie les régions de forte densité sous-surface. Le potentiel de faux positifs est réduit par l'analyse de la forme volumétrique et les caractéristiques de texture des régions de polypes candidats.

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