System and method for segmenting a region in a medical image

G - Physics – 06 – T

Patent

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G06T 7/60 (2006.01) A61B 8/14 (2006.01) G06T 5/00 (2006.01)

Patent

CA 2666313

A method and computer program are provided for segmenting a prostate from a medical image such as an ultrasound image. Each slice in a study is analysed and uses a manual initialization to obtain an initial contour, in which a user selects initial points that are automatically rendered on the image. An automatic refinement stage then snaps the contour to the prostate boundary in the image based on a pre-stored anatomical atlas and edge information obtained from the image. A manual adjustment stage may then be performed and if selected, the contour is automatically propagated to the next image slice to avoid the manual initialization. An auxiliary image slice may be referred to, which indicates how the prostate shape changes from slice to slice, e.g. by providing a perpendicular profile.

La présente invention concerne un procédé et un programme informatique permettant de segmenter une prostate à partir d'une image médicale telle qu'une image d'ultrasons. Chaque tranche lors d'un examen est analysée et utilise une initialisation manuelle pour obtenir un premier contour, un utilisateur sélectionnant les premiers points qui sont automatiquement rendus sur l'image. Une étape d'affinement automatique affine ensuite le contour par rapport à la forme de la prostate sur l'image sur la base d'un atlas anatomique préstocké et des informations sur le pourtour qui sont obtenues depuis l'image. Une étape d'ajustement manuel peut ensuite être effectuée et, s'il est sélectionné, le contour est automatiquement transmis à la tranche d'image suivante afin d'éviter une nouvelle initialisation manuelle. On peut se référer à une tranche d'image auxiliaire qui montre comment la forme de la prostate change de tranche en tranche, par exemple, en disposant un profil perpendiculaire.

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