TY - GEN
T1 - Time reversal ultrasound focusing to a point away from the beacon location
AU - Sinelnikov, Yegor
AU - Sutin, Alexander
AU - Gandhi, Gaurav
AU - Sarvazyan, Armen
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - intravascular catheter
KW - phase extrapolation
KW - time reversal acoustic
KW - ultrasound focusing
UR - http://www.scopus.com/inward/record.url?scp=84873136325&partnerID=8YFLogxK
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U2 - 10.1063/1.4757357
DO - 10.1063/1.4757357
M3 - Conference contribution
AN - SCOPUS:84873136325
SN - 9780735410930
T3 - AIP Conference Proceedings
SP - 329
EP - 336
BT - 11th International Symposium on Therapeutic Ultrasound
T2 - 11th International Symposium on Therapeutic Ultrasound, ISTU 2011
Y2 - 11 April 2011 through 13 April 2011
ER -