Three dimensional arrays of data representing measures of human body tissue properties are produced with x-ray computed tomography, nuclear medicine, ultrasound and nuclear magnetic resonance imaging instruments. Array sizes vary from (64,64,64) to (512,512,128). Techniques to review the array values on a display screen include oblique plane, reprojection with selected dissolution, and simulated surface illumination display. The number of computer instructions required to generate these displays varies from 3.5 to 2500 million .The implementation of these methods requires large, fast random access memory (16 megabytes) and computers capable of executing a minimum of 10 million instructions per second. While computationally expensive, the use of three dimensional display techniques can be essential for accurate disease diagnosis and for optimizing disease treatment.