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Ultrasound waves propagating in water or soft biological tissue are stronglyreflected when encountering the skull, which limits the use of ultrasound-basedtechniques in transcranial imaging and therapeutic applications. Currentknowledge on the acoustic properties of the cranial bone is restricted tofar-field observations, leaving its near-field properties unexplored. We reporton the existence of skull-guided acoustic waves, which was herein confirmed bynear-field measurements of optoacoustically-induced responses in ex-vivo murineskulls immersed in water. Dispersion of the guided waves was found toreasonably agree with the prediction of a multilayered flat plate model. It isgenerally anticipated that our findings may facilitate and broaden theapplication of ultrasound-mediated techniques in brain diagnostics and therapy.

Prediction and near-field observation of skull-guided acoustic waves