1. A method for interactively displaying three dimensional structures from a three-dimensional volume of data representing at least one physical property associated with a three dimensional body, comprising the steps of: a) isolating a selected region of interest from the volume of data based on selected values of the physical property representing the isolated region of interest, wherein the step of isolating the selected region of interest comprises a thresholding step for determining threshold values corresponding to the selected the physical property to isolate the selected region of interest; and b) rendering the isolated region of interest in an interactive three-dimensional display.