1. A method for registering a two-dimensional image of a cardiocirculatory structure and a three-dimensional image of the cardiocirculatory structure, comprising: acquiring a three-dimensional image including the cardiocirculatory structure using a first imaging modality; projecting the acquired three-dimensional image into two-dimensions to produce a two-dimensional projection image of the cardiocirculatory structure; segmenting a structure of interest either from the three-dimensional image prior to projection or from the projection image subsequent to projection; acquiring a two-dimensional image of the cardiocirculatory structure using a second imaging modality; segmenting the structure of interest from the acquired two-dimensional image; generating a first distance map based on the two-dimensional projection image; generating a second distance map based on the acquired two-dimensional image; and performing registration of the three-dimensional image and the two-dimensional mage by minimizing a difference between the first and second distance maps, wherein the above steps are performed using a computer system.