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Direct methods for characterizing high-intensity focused ultrasound transducers using acoustic streaming
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10.1121/1.2957937
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Affiliations:
1 Division of Solid and Fluid Mechanics, Center for Devices and Radiological Health, U. S. FDA, 10903 New Hampshire Avenue, Building 62, Room 2231, Silver Spring, Maryland 20993-0002
a) Author to whom correspondence should be addressed. Electronic mail: matthew.myers@fda.hhs.gov
J. Acoust. Soc. Am. 124, 1790 (2008)
/content/asa/journal/jasa/124/3/10.1121/1.2957937
http://aip.metastore.ingenta.com/content/asa/journal/jasa/124/3/10.1121/1.2957937

## Figures

FIG. 1.

Streaming velocity contour for HIFU-3 transducer. Acoustic power: .

FIG. 2.

Comparison of radial streaming velocity profile obtained from (i) PIV experiments and from (ii) curve fitting the experimental velocity with the error function expression. Transducer: HIFU-2; acoustic power: .

FIG. 3.

Effect of mesh size: Acoustic intensity as a function of radial distance (cm) obtained from finite-difference method for three different mesh sizes (i) , (ii) , and (iii) . Acoustic power: ; transducer: HIFU-3.

FIG. 4.

(a) Acoustic intensity as a function of radial distance (cm) obtained from the finite-difference, Gaussian curve fit, and iterative methods. Acoustic power: ; transducer: HIFU-1. (b) Normalized acoustic intensity as a function of radial distance (cm) obtained from the finite-difference, Gaussian curve fit, and iterative methods. Acoustic power: ; transducer: HIFU-1.

FIG. 5.

(a) Acoustic intensity as a function of axial distance (cm) obtained from the finite-difference, Gaussian curve fit, and iterative methods. Acoustic power: ; transducer: HIFU-1. (b) Normalized acoustic intensity as a function of axial distance (cm) obtained from the finite-difference, Gaussian curve fit, and iterative methods. Acoustic power: ; transducer: HIFU-1.

FIG. 6.

(a) Acoustic intensity as a function of radial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, (iii) iterative, and (iv) hydrophone measurement. Acoustic power: ; transducer: HIFU-2. (b) Normalized acoustic intensity as a function of radial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, (iii) iterative, and (iv) hydrophone measurement. Acoustic power: ; transducer: HIFU-2.

FIG. 7.

(a) Acoustic intensity as a function of axial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, (iii) iterative, and (iv) hydrophone measurement. Acoustic power: ; transducer: HIFU-2. (b) Normalized acoustic intensity as a function of axial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, (iii) iterative, and (iv) hydrophone measurement. Acoustic power: ; transducer: HIFU-2.

FIG. 8.

(a) Acoustic intensity as a function of radial distance (cm) obtained from the methods: (i) finite difference, (ii) Gaussian curve fit, (iii) iterative, and (iv) hydrophone measurements. Acoustic power: ; transducer: HIFU-3. (b) Normalized acoustic intensity as a function of radial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, (iii) iterative, and (iv) hydrophone measurements. Acoustic power: ; transducer: HIFU-3.

FIG. 9.

(a) Acoustic intensity as a function of axial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, (iii) iterative, and (iv) hydrophone measurements. Acoustic power: ; transducer: HIFU-3. (b) Normalized acoustic intensity as a function of axial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, (ii) iterative, and (iv) hydrophone measurements. Acoustic power: ; transducer: HIFU-3.

FIG. 10.

Radial intensity profiles obtained from (i) GCF method, (ii) hydrophone measurements, and (iii) polynomial curve fit of GCF results. Acoustic power: ; transducer: HIFU 3.

FIG. 11.

Acoustic intensity as a function of radial distance (cm) obtained from the methods: (i) finite-difference, (ii) Gaussian curve fit, and (iii) iterative. Acoustic power: ; transducer: HIFU 3.

FIG. 12.

Peak acoustic intensity as a function of input acoustic power (W) for HIFU 3 transducer.

## Tables

TABLE I.

Physical characteristics of HIFU transducers used in the experiments.

/content/asa/journal/jasa/124/3/10.1121/1.2957937
2008-09-01
2014-04-18

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