Numerical study of the effective combination of microbubbles and ultrasound in HIFU therapy

Kohei Okita, Kazuyasu Sugiyama, Kenji Ono, Shu Takagi, Yoichiro Matsumoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

The effective combination of microbubbles and ultrasound in HIFU therapy has been investigated through a numerical simulation. The equations for conservation of mass, momentum and energy are solved for a microbubble-infused mixture, and model HIFU therapy in the presence of microbubbles. The bubbles follow Rayleigh-Plesset equation, and are coupled with the mixture using the Euler-Lagrange method. The impacts of both the volume fraction due to the microbubbles and the amplitude of the ultrasound on the heat distribution are analyzed by using a two dimensional cylindrical simulation of the propagation of focused ultrasound (1MHz) through a mixture of bubbles 1.3mm in diameter. As the initial void fraction increased, the shape of the high temperature region was observed to change from cigar shape, to tadpole shaped, to cone shape. It was numerically confirmed that the temperature dramatically increased by means of inertial cavitation. The results show that the effectiveness of HIFU therapy increases with increased initial void fraction, as well as an input ultrasound amplitude above the threshold required for inertial cavitation.

Original languageEnglish
Title of host publication10th International Symposium on Therapeutic Ultrasound, ISTU 2010
Pages437-442
Number of pages6
Volume1359
DOIs
Publication statusPublished - Oct 13 2011
Externally publishedYes
Event10th International Symposium on Therapeutic Ultrasound, ISTU 2010 - Tokyo, Japan
Duration: Jun 9 2010Jun 12 2010

Other

Other10th International Symposium on Therapeutic Ultrasound, ISTU 2010
CountryJapan
CityTokyo
Period6/9/106/12/10

Fingerprint

therapy
cavitation flow
voids
bubbles
Rayleigh equations
conservation
cones
simulation
momentum
heat
thresholds
propagation
temperature
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Okita, K., Sugiyama, K., Ono, K., Takagi, S., & Matsumoto, Y. (2011). Numerical study of the effective combination of microbubbles and ultrasound in HIFU therapy. In 10th International Symposium on Therapeutic Ultrasound, ISTU 2010 (Vol. 1359, pp. 437-442) https://doi.org/10.1063/1.3607946

Numerical study of the effective combination of microbubbles and ultrasound in HIFU therapy. / Okita, Kohei; Sugiyama, Kazuyasu; Ono, Kenji; Takagi, Shu; Matsumoto, Yoichiro.

10th International Symposium on Therapeutic Ultrasound, ISTU 2010. Vol. 1359 2011. p. 437-442.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Okita, K, Sugiyama, K, Ono, K, Takagi, S & Matsumoto, Y 2011, Numerical study of the effective combination of microbubbles and ultrasound in HIFU therapy. in 10th International Symposium on Therapeutic Ultrasound, ISTU 2010. vol. 1359, pp. 437-442, 10th International Symposium on Therapeutic Ultrasound, ISTU 2010, Tokyo, Japan, 6/9/10. https://doi.org/10.1063/1.3607946
Okita K, Sugiyama K, Ono K, Takagi S, Matsumoto Y. Numerical study of the effective combination of microbubbles and ultrasound in HIFU therapy. In 10th International Symposium on Therapeutic Ultrasound, ISTU 2010. Vol. 1359. 2011. p. 437-442 https://doi.org/10.1063/1.3607946
Okita, Kohei ; Sugiyama, Kazuyasu ; Ono, Kenji ; Takagi, Shu ; Matsumoto, Yoichiro. / Numerical study of the effective combination of microbubbles and ultrasound in HIFU therapy. 10th International Symposium on Therapeutic Ultrasound, ISTU 2010. Vol. 1359 2011. pp. 437-442
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