Coagulation of swine liver and canine prostate with a prototype split-focus transducer

S. Umemura, K. Sasaki, K. Kawabata, T. Azuma, N. T. Sanghvi

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


The split-focus approach has a potential to substantially improve the throughput of coagulation HIFU treatment. A prototype split-focus transducer with two elements at 4.3 MHz combined with a small imaging probe at 6.5 MHz was constructed for transrectal treatment of a prostate. Computer simulation predicted that a coagulation volume approximately three times larger than single-spot focus would be obtained with split focus. Swine liver lobes were intraoperatively insonated for 4 s at a peak intensity of 850 W/cm2. A lesion of coagulative necrosis three to six times larger than single-spot focus in volume was formed with the split focus. A canine prostate was then transrectally treated. A cavity, 0.35-0.45 cm3 in volume, was formed with only four shots of split-focus insonation.

Original languageEnglish
Pages (from-to)1439-1442
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Publication statusPublished - 1999 Dec 1
Event1999 IEEE Ultrasonics Symposium - Caesars Tahoe, NV, USA
Duration: 1999 Oct 171999 Oct 20

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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