Its like watching whole TITANIC movie and asking .."How did that airplane crashed in ocean"
yes ..main innovation is differential image processing ...and No it is not the simulation of real time images...Its actual ...and I hope you understand how Nyquist theory works in voice processing....
mr_sano The alternative is to cut open the patient, but that wouldn't do would it. Noting you see is in "real time", but its so close that it is insignificant to your daily life.