In this paper

we presented the way to register or fuse CT and MR multi-modality image based on the Legendre moment. Because Legendre moment has the merits of orthogonal and minimal information redundancy

by using it

we can find the center of mass of CT and MR images

calculate the scale factor of these images

then the translation and rotation of these images can be performed

these images are registered precisely;Optimizing the Legendre moment's algorithm

we quickened up the registration or fusion of CT and MR images. This method proved to be effective

simple in the registration of multi-modality medical images in our experiment. Legendre moment is also important to the registration and fusion in multi-modality medical image

and in the radiotherapy treatment program system.