On reading brains with light, https://news.ycombinator.com/item?id=28399099#28400060 https://news.ycombinator.com/item?id=28399099#28400060 : > What about wit

On reading brains with light, https://news.ycombinator.com/item?id=28399099#28400060 https://news.ycombinator.com/item?id=28399099#28400060 : > What about with realtime NIRS with an (inverse?) scattering matrix? FWIU Openwater's technology portfolio includes targeted ultrasound with e.g. NIRS and LSI/LSCI: https://www.openwater.health/technology https://www.openwater.health/technology One of their demo videos explains how inverting the scattering caused by the occluding body yields the mass-density at least (?). [Radio]Spectroscopy and quantum crystallography may have additional insight for tissue identification with low-cost NIRS sensor data? Open fNIRS: https://openfnirs.org/ https://openfnirs.org/ "Quantum light sees quantum sound: phonon/photon correlations" (2023) https://news.ycombinator.com/item?id=37793765 https://news.ycombinator.com/item?id=37793765 ; the photonic channel actually embeds the phononic field