Really cool project! Do you have a total cost estimate somewhere? I toyed with a similar idea a couple of years back, but a friend who was actually working on d

Really cool project! Do you have a total cost estimate somewhere? I toyed with a similar idea a couple of years back, but a friend who was actually working on developing algorithms for medical ultrasound told me I'd be looking at several thousand dollars worth of hardware. Importantly, how many transducers are you planning on using? I understand typical medical ultrasound uses a phased array with hundreds of transducers. That's what drove up my friend's cost estimate. What you can do with a single transducer, though, is listen to a baby's heartbeat using the Doppler effect. (You can buy a fetal Doppler device on Amazon for about $40, that could be a good reference for calibrating your power output to make it reasonably safe.)