High-tech diagnostic imaging techniques are powerful medical tools that allow physicians to explore bodily structures and functions with a minimum of invasion to the patient. Advances in diagnostic technology allow physicians the ability to evaluate processes and events as they occur in vivo (in the living body). During the 1970s, advances in computer technologies, in particular the development of algorithms powerful enough to allow difficult equations to be solved quickly enough to be of real-time use in the clinical diagnostic setting and to eliminate "noise" from sensitive measurements, allowed the development of accurate, accessible and relatively inexpensive (when compared to surgical explorations) non-invasive technologies. Although relying on different physical principles (i.e., electromagnetism vs. sound waves), all of the high-tech methods relied on computers to construct visual images from a set of indirect measurements. The development of high-tech diagnostic tools was the direct result of the clinical application...