A method for obtaining a high-resolution nuclear image of a biological object, which image is acquired by a nuclear detector inside an MRI system includes the steps of acquiring MRI information pertaining to a wide field of view focusing a field of view of the nuclear detector to a small region that covers only the target region obtaining a nuclear image of the small region and using a priori information included in the MRI information to eliminate image artifacts in the nuclear image. An apparatus for performing the method and a data image formed by practice of the method is also included.
