An fMRI machine is very expensive and deserves a cheap in-home model if possible. How can one be built in to a helmet? The idea as far as I've seen is a combination of radio waves and magnets that show what the blood vessels in the brain are doing. That feature plus a polygraph used at the same time is reportedly 100% effective at lie detection. There are serious needs for 100% correct lie detection, starting with courts which currently toss 25% average to 60% on some crimes innocent people into prison. Folks at home would like an accurate answer to family questions like, where were you last night?
So to start with, what are the physics involved that need to be simulated a cheaper way? What are the radio wave frequencies, detection techniques, magnet fields required? I've been in a CT scan machine and see the hula-hoop of electronics spinning around - can that motion be simulated like stationary radar antennas do? What else is needed to get the job done? Thank you.