1. A system for interactively displaying three dimensional structures comprising: a. volume formation means for forming a three-dimensional volume of data from a series of two-dimensional images representing at least one physical property associated with a three dimensional body; b. segmentation means for segmenting a region of interest from the volume of data based on selected values of the physical property representing the region of interest; c. means for producing a wireframe model of the segmented region of interest, the wireframe model comprising a plurality of vertices, each vertex having a coordinate position; d. means for refining the wireframe model by adjusting the coordinate positions of the vertices to more accurately represent the region of interest; and e. rendering means for rendering the wireframe model in an interactive three-dimensional display, therein producing a virtual three-dimensional environment, wherein the segmentation means approximates the region of interest and the refinement means adjusts the coordinate positions of the vertices along a normal vector associated with each vertex.