Enhancement of ultrasonic heating with microbubbles and their localization in target tissue

Shin Ichiro Umemura, Shin Yoshizawa, Yoichiro Matsumoto, Kazuaki Sasaki, Rei Asami, Ken Ichi Kawabata

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


The bioeffect of ultrasound can be enhanced by orders of magnitude with microbubbles in a few ways. Enhancement of ultrasonic tissue absorption with a microbubble agent has been demonstrated both in theory and in an in vivo experiment. The ultrasonic power absorbed by a microbubble in its continuous wave response was numerically estimated. It has been predicted that the tissue ultrasonic absorption will be doubled when resonant microbubbles are delivered to the tissue at a concentration in the order of ten bubbles /mm3. An exteriorized murine kidney was exposed to focused ultrasound at 3.2 MHz. With an intravenous bolus administration of 0.2 ml/kg OptisonTM, the ultrasonically induced tissue temperature elevation was multiplied by up to five times. This effect will be useful for therapeutic ultrasound if microbubbles are selectively distributed in the target tissue by ultrasound pulses focused to the tissue. Tissue selective nano-droplets which can be phase-changed to microbubbles by ultrasonic stimulation will be a key to this approach.

Original languageEnglish
Title of host publication2009 IEEE International Ultrasonics Symposium and Short Courses, IUS 2009
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages8
ISBN (Print)9781424443895
Publication statusPublished - 2009
Event2009 IEEE International Ultrasonics Symposium, IUS 2009 - Rome, Italy
Duration: 2009 Sept 202009 Sept 23

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117


Conference2009 IEEE International Ultrasonics Symposium, IUS 2009


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