... the small target size. In this feasibility study, an annular actuator placed on the surface of the fingertip and driven harmonically at multiple frequencies sequentially creates geometrically focused surface (GFS) waves. These surface wave propagation patterns are measured using scanning laser Doppler...

.... Temporal response simulations, highlighted in Figs. 7 and 8 , could be useful in design and optimization of such source(s) localization strategies. They also highlight how rapidly the acoustic wave propagating through the bronchial tree attenuates due to the significant acoustic impedance mismatches...