alt Hacker NewsMRI physicist here as well. I have a basic understanding of ultrasound, and this looks like an array of transducers organized to perform tomography, just as CT did for Xray.
However Ultrasound quality depends highly on transducer-skin contact.
Any physicists here to comment on the effects of sonar through liquid and the effects on image resolution and field of view?
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apaprocki • today at 9:06 AM
This paper, “Whole Cross-Sectional Human Ultrasound Tomography”, goes into more detail.
This is precisely why you do it in water - the water-skin contact is effectively perfect, as is the water-transducer interface, and the body of water is easily characterizable; in effect you are scanning one large object that consists of a body of water that just happens to have a human body in it, and then extracting the body from that scan.