I might not get what I want, but I guess I got what I need. (Ultrasound reading notes)

Do you ever wonder how medical ultrasound scanners work? Because I sure did. I still do, actually, and I've taken a course describing the subject and I've been reading and ebay-browsing all night on the subject. Here are a few points of general interest that I've discovered.

1. Some ultrasound components can also be used for making pain field generators (2). Allegedly. 
2. The cheapest medical ultrasound transducers on the market are all endocavity probes. That means they get shoved inside you, one way or the other. (there are actually 3 common ways, and that does not vary by gender. Sorry.). I've recently seen some things I wish I could un-see. Things that I'm too kind to link to here. But since you're a curious reader, here's a fun fact from our friends at CIVCO: ”Recommended for every transrectal and transvaginal scanning procedure, CIVCO's endocavity covers are available in sterile and non-sterile ” 
3. Medical ultrasound scanners operate (on the transducer side anyhoo) at very high power levels that I don't trust myself with, so I'm building something very scaled down for the time being.