I like the question, its worth asking as technology improves. There are lots of great comments too about the challenges that are non-trivial. Generally my use of ultransonics has been constrained to robotic localization and party tricks but imaging is an interesting question too.
Arrays of sensors is still hard, driving them, reading them, and interpreting them. That particular engineering problem hasn't gotten that much easier.
Arrays of sensors is still hard, driving them, reading them, and interpreting them. That particular engineering problem hasn't gotten that much easier.