This is cool! I've got a personal project in the works to build an ultrasound machine just to learn how it works. There's a lot of electronics design, PCB design, FPGA work etc that in learning.
The probes themselves are used medical grade ones from ebay.
The hard part is that there can be over hundreds of piezo elements each needing to receive on their own channel. That means lots of expensive ADCs. Not to mention either having many pulser circuits or muxing a pulser to many elements.
5 grams of mushrooms is not the same as 5 grams of psilocybin. When taking about mg, I think they mean psilocybin. When talking about grams, it's mushrooms
So far I've got the analog front end manufactured and sitting on my desk able to stream 40Msps of data to my computer.
I bought some used ebay convex medical probes with like 360 connections and have started to reverse engineer them.
There's a lot of FPGA work involved and ive got AI helping me out. It's surprisingly been really good at FPGA programming.