Time reversal ultrasound focusing to a point away from the beacon location

Yegor Sinelnikov, Alexander Sutin, Gaurav Gandhi, Armen Sarvazyan

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

Abstract

In percutaneous procedures there is often a need to focus therapeutic ultrasound to a predefined area without affecting surrounding tissues. Focusing based on Time Reversal Acoustics (TRA) principles constitutes a promising approach for generating high intensity ultrasound field tailored to the shape of the predefined area. Conventional TRA technique enables ultrasound focusing only at a site, where there is an ultrasound beacon, e.g. piezo-transducer mounted at the tip of a catheter. We developed a method of steering the focus away from the beacon location. The method is based on the measurements of impulse response (IR) in several reference points and calculating virtual IRs for the points outside the reference beacon location. The IR for the point away from the beacon is constructed based on mathematical extrapolation of the measured reference IRs frequency spectra, particularly phases. The effectiveness of extrapolated TRA focusing is explored experimentally and by computer simulation. Potential applications include ultrasounda-ssisted drug delivery, artery recanalization and tumor ablation.

Original languageEnglish
Title of host publication11th International Symposium on Therapeutic Ultrasound
Pages329-336
Number of pages8
DOIs
StatePublished - 2012
Event11th International Symposium on Therapeutic Ultrasound, ISTU 2011 - New York, NY, United States
Duration: 11 Apr 201113 Apr 2011

Publication series

NameAIP Conference Proceedings
Volume1481
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference11th International Symposium on Therapeutic Ultrasound, ISTU 2011
Country/TerritoryUnited States
CityNew York, NY
Period11/04/1113/04/11

Keywords

  • intravascular catheter
  • phase extrapolation
  • time reversal acoustic
  • ultrasound focusing

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