[KaiserPro]

> it's non-ionising

True, but ultrasound isn't entirely benign. Depending on what frequency and what power it can crack solid parts of the body (its used to break up kidney/gall stones) it also can heat things up (which is, assuming my understanding is correct, why doppler scans for blood flow are not done on <18 week pregancy)

[tylergetsay]

The probes they're using are off the shelf probes used everywhere including on small animals, I don't see how you could compare that to a lithotripsy

[jkahrs595]

lasers can cut steel, so barcode scanners aren’t entirely benign

[KaiserPro]

Yes, no Reductio ad absurdum.

My point is, phased arrays of ultrasound have the ability to be destructive. In the same way that a single MIMO wifi AP isn't going to cook you, but 10,000 MIMO arrays steering coherently over you will.