Medical image registration based on phase congruency and RMI

In this paper, a new approach of multi-modality image registration is represented with not only image intensity, but also features describing image structure. There are two novelties in the proposed method. First, instead of standard Mutual Information (MI) based on joint intensity histogram, Regional Mutual Information (RMI) is employed, which allows neighborhood information to be taken into account. Second, a new feature images obtained by means of phase congruency are invariants to brightness or contrast changes. By incorporating these features and intensity into RMI, we can combine aspects of both structural and neighborhood information together, which offers a more robust and a high level of registration accuracy.