Instead of vibrating crystals, Butterfly IQ uses "capacitive micro-machined ultrasound transducers", or CMUTs, tiny ultrasonic emitters layered on a semiconductor chip a little larger than a postage stamp. "The device gives you the ability to do everything at the bedside: you can pull it out of your pocket and scan the whole body," Martin said. The company now plans to combine the instrument with artificial-intelligence software that could help a novice position the probe, collect the right images, and interpret them. By 2018, its software will let users automatically calculate how much blood a heart is pumping, or detect problems...