Key points from article :
Microwaves heat up flesh-like material by only 1/1000th of a degree.
Ultrasound pressure waves given off that could be detected
New detector copes with drastic transmission loss when sound jumps from the solid to air.
Technique derived from DARPA research designed to detect buried plastic explosives.
Decade away from practical use – test was to detect location of a 4 square centimetre embedded target.
The study was published in the Applied Physics Letters.
