1. A method of fusing two digitized image datasets for 2-dimensional visualization of the heart, comprising the steps of: providing a first digitized image and a second digitized image, each image acquired from a different imaging modality and each comprising a plurality of intensities corresponding to a domain of points on a 3-dimensional grid, and wherein the first and second images have been registered; segmenting the heart in one of said digitized images; forming a 2-dimensional maximum intensity projection of a surface of said heart from each of said digitized images; and fusing said images by overlaying one 2-dimensional projection of said surface over the other 2-dimensional projection of said surface.