A medical image fusion method and system

The invention discloses a medical image fusion method and a medical image fusion system. The method comprises steps: a registered CT image and an ultrasonoscopy are obtained; the boundary contour of hard tissue in CT image and ultrasound image is marked; the boundary contour divides CT image and ultrasound image into hard tissue region, hard soft tissue boundary region and soft tissue region; theregion weight pairs ([Mu]1,[Mu]2) corresponding to the hard tissue region, the hard tissue boundary region and the soft tissue region are obtained; the pixel gray values X of the fusion image after weighted fusion of the hard tissue region, the hard tissue boundary region and the soft tissue region are calculated respectively to generate a fusion image. The technical proposal provided by the embodiment of the invention has displacement invariance, does not distort the fused image when the image registration is not accurate enough, is favorable for application and popularization, does not appear obvious mosaic trace an