Ultrassons a 100€?

https://www.sciencedaily.com/releases/2018/09/180911110232.htm

Citando:
"Engineers have developed a new ultrasound transducer, or probe, that could dramatically lower the cost of ultrasound scanners to as little as $100. Their patent-pending innovation -- no bigger than a Band-Aid -- is portable, wearable and can be powered by a smartphone."