That's too bad... because he's also disproved the cloak of invisibility!
In fact, I suspect this sort of proof may be useful to other fields of tomography (eg CT / MRI) beyond UltraSound, if it really improves complete imaging knowing only shortest (eg highest index) paths from the surface. I guess the sparseness helps minimize errors faster than current techniques, although it's not clear to me how that necessarily follows from the mathematical proof.
If time-of-flight is the only necessary information to discover an objects structure, then all cloaking can be defeated because you can by necessity just detect that a light pulse took longer then expected to be returned (because it was bent around the object).
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[ 0.20 ms ] story [ 38.6 ms ] threadIn fact, I suspect this sort of proof may be useful to other fields of tomography (eg CT / MRI) beyond UltraSound, if it really improves complete imaging knowing only shortest (eg highest index) paths from the surface. I guess the sparseness helps minimize errors faster than current techniques, although it's not clear to me how that necessarily follows from the mathematical proof.