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Cavitation Inception by Dual-Frequency Excitation in High-Intensity Focused Ultrasound Treatment
- Source :
- Japanese Journal of Applied Physics. 50:07HF14
- Publication Year :
- 2011
- Publisher :
- IOP Publishing, 2011.
-
Abstract
- In our previous study, we proposed a “triggered high-intensity focused ultrasound (HIFU)” exposure sequence, in which a high-intensity triggering pulse was irradiated just before CW heating waves, to accelerate HIFU treatment. In this study, the second-harmonic was superimposed to the triggering pulse, and the cavitation threshold was investigated by comparing different schemes of second-harmonic superimposition including the case of single-frequency exposure through detecting the subharmonic emission and high-speed camera observation. The experimental results show that cavitation bubbles can be generated most efficiently by using negative-peak-pressure emphasized waves followed by positive-peak-pressure emphasized waves.
- Subjects :
- Subharmonic
Materials science
Physics and Astronomy (miscellaneous)
business.industry
Pulse (signal processing)
Acoustics
medicine.medical_treatment
General Engineering
General Physics and Astronomy
High-intensity focused ultrasound
Optics
Hifu treatment
Cavitation
medicine
Dual frequency
Irradiation
business
Excitation
Subjects
Details
- ISSN :
- 13474065 and 00214922
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- Japanese Journal of Applied Physics
- Accession number :
- edsair.doi.dedup.....c57400dae85914cbe30bc3cf067728c9