Ultrasound systems is probably the cheapest modality, there is quite a lot of competition in this market, there is a lot of innovations in this market, the mach

Ultrasound systems is probably the cheapest modality, there is quite a lot of competition in this market, there is a lot of innovations in this market, the machine are getting cheaper and more compact, and at least in the developed world there is no penury of ultrasound systems, the regulation are there to prevent somebody to build a shitty machine that for example burns you with and endoscopic probe (you would not like that), and the interpretation of ultrasound images requires to be highly trained (you won't even understand the basic physical features you have before your eyes if you are not trained, due to various artifacts that are intrinsical to the technology), which limit the potential for delivery machines to a significantly larger market, because all those machines would be of no use.