Abstract
In order to model possible effects of cavitation on bone structure, the formation of cavitation along an acoustically reflective PVC surface was studied. The bubbles were generated by a commerical therapeutic transducer (1 MHz), for both water and agar gel mediums. Bubble formation and activity were monitored using light scattering techniques: a HeNe laser was directed through the medium, and the transmitted light was detected using an optical power meter. The data show a decline in cavitation activity further from the surface and offer suggestive evidence of a boundary layer. Temporal saturation is also evident in both mediums, though an anomalous increase in transmitted light for the agar medium suggests the possibility of pressure variations due to microstreaming. Analysis of the microstreaming pattern was subsequently performed at lower frequencies in order to allow visualization with a standard laboratory microscope.
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