1. A method for interactively displaying three-dimensional structures comprising the steps of: A. 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. segmenting a selected region of interest from the volume of data based on selected values of the physical property representing the selected region of interest; and C. rendering the segmented region of interest as a surface rendering in an interactive three-dimensional display, therein producing a virtual three-dimensional environment, wherein the step of rendering the segmented region of interest comprises a volume rendering step for rendering selected volumes adjacent the segmented region of interest.