I remember, from years ago, a software called (I think) Inventor. It was by Silicon Graphics and ran on SGI UNIX work stations. It was used for CAT scan visualization and other 3D data visualization. There was a graphical programing environment and a 3D visualizer with the expected zoom and rotate and transparency features. I have no idea if it is still around, but perhaps you local radiologist has some cool software.
Good Luck
Kirk