1. A medical imaging apparatus comprising: a storage unit configured to store a patient adaptive object model in which a statistical object model related to transformation of an object caused by a periodic movement is applied to characteristics of the object of a target patient; an image obtainer configured to acquire a first image of the target patient; and an image fuser configured to transform a second image of the target patient based on differences between a shape of the object extracted from the patient adaptive object model and a shape of the object displayed on the first image.