With the math on transducer costs, you&#x27;ve basically answered the question. However, aliexpress will get you 2MHz transducers 10x cheaper if you buy them in bulk. Then of course you have to worry about dodgy chinese website component quality.<p>I also think you&#x27;re seriously underestimating the computational cost of converting the measured signal to a usable image. No way is an RPi fast enough to produce a live image with decent quality. There are quite a few papers in the literature about using high-end GPUs to speed up ultrasound imaging and denoising, for commercial vendors I&#x27;m guessing it&#x27;s custom ASIC territory.