1. A medical system 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: a) a data isolator configured to isolate 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 data isolator comprises a thresholder configured to determine threshold values corresponding to the selected the physical property to isolate the selected region of interest; and b) an image renderer configured to render the isolated region of interest in an interactive three-dimensional display, wherein the thresholder comprises a threshold range selector configured to select a threshold range corresponding to the selected values of the physical property representing the region of interest and a threshold adjustor configured to adjust threshold values to establish the threshold range for isolating the region of interest.