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. 2017 Mar 1;12(3):e0172624. doi: 10.1371/journal.pone.0172624

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© 2017 Caberlotto et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — The frequency and amplitude was verified in vivo in the forearm with ultrafast ultrasound imaging. (A) Spatiotemporal spreading of vibrations generated by the device at 65 Hz in the forearm of healthy volunteer of 26yo. The frequency and the amplitude of the displacement imposed to the skin were measured at a point 25 mm far from the source and 500μm depth on the tissue (the exact position is marked with an arrow). (B) The amplitude of the vibration measured the point marked in pink in A is about 150μm peak to peak. (C) The spectrum of the displacement field (averaged calculated in the full dermis and expressed in Arbitrary Units) shows that the fundamental frequency is 65 ± 3 Hz. (D) The spectrum of the displacement field (averaged calculated in the full dermis and expressed in Arbitrary Units) shows that the fundamental frequency is 85 ± 3 Hz.