The present application provides a method and system for obtaining connected domains of the left atrium and the left ventricle on the basis of a CT image. The method comprises: removing the lungs, descending aorta, spine, and ribs from a CT image to obtain a new image; obtaining an aortic center line in the new image; obtaining an aortic image according to the extension direction of the aortic center line and the Bezier curve rule; and after the aortic image is removed from the new image, picking up pixel points, around the point of center of gravity the left ventricle, having the grayscale values Q greater than the grayscale threshold Qdescending of the descending aorta, to obtain a connected domain image of the left atrium and the left ventricle. The present application relates to a novel method for obtaining the left atrium and the left ventricle, and the method has advantages of being rapid and accurate in extraction and high in calculation speed.
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