> I dont understand though, why you have to simultanously do this from all sides- have the ultrasound swim around with the patient? Takes out the comlexity?

One sensor can only see waves that reflect straight back. If you have more sensors (and fire them sequentially, like they do) you can detect pulses that are deflected, and measure the deflection angle. That gives you much better data

I get the impression that what they want is real-time scans, so you can see the organs moving and everything. But that would require a 3d arrangement of sensors, which is too expensive. Instead they have a 2d arrangement and move the sensor relative to the person in 1d. Having only one sensor and moving it in 2d would harm scanning speed and fidelity even more.

I don’t know if you’re joking, but liquid breathing has only really been tested on rats, like famously the one from The Abyss https://en.wikipedia.org/wiki/The_Abyss, which died a couple of days later.

As I understood it, they're using the rest of the array to receive when one is transmitting, thus getting signal from the opposite side of the body as well. I don't see how you can do this with just one device.

You’re suggesting flooding the lungs in order to get a scan?