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Microbubble oscillation in tubes with diameters of 12, 25, and 195 microns
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic representation of acoustic and optical alignment achieved with needle hydrophone. Transducer focal length, , is 2 in and typical tube depth is approximately Expanded area shows phantom and microbubble location. —inner diameter, —outer diameter, distance of microbubble from tube end, and —microbubble diameter.

Image of FIG. 2.
FIG. 2.

(a) , , , PMMA tube, ; (b) , , , PMMA tube, ; (c), , , PMMA tube, ; (d), , , PMMA tube, . Oscillation amplitude in (d) is greater than (b) and (c), but less than (a). Scale bar indicates spatial dimension along vertical axis, vertical lines indicate increments.

Image of FIG. 3.
FIG. 3.

Normalized expansion of a microbubble based on experimental observations and Rayleigh-Plesset predictions. (a) Bubble expansion in tube with and at multiple transmission pressures and in cellulose tube with and insonation at 1.4 MPa. (b) Expansion and fragmentation with a 1 MHz, 5 cycle pulse PMMA tube with , comparing and . (c) Expansion ratios for microbubbles driven with a 1 MHz, 5 cycle pulse for three tube diameters: , , and (cellulose). (d) Rayleigh-Plesset predictions for microbubble expansion in an infinite fluid at three transmission pressures and experimental observations for the expansion in the first two cycles in cellulose tubing with .

Image of FIG. 4.
FIG. 4.

Streak image demonstrating displacement due to radiation force produced by a 5 MHz, 20 cycle pulse with a in a tube with and . A microbubble with initial diameter of approximately is displaced by this pulse, and the microbubble is intact after insonation.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microbubble oscillation in tubes with diameters of 12, 25, and 195 microns