1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Split-focused ultrasound transducer with multidirectional heating for breast tumor thermal surgery
Rent:
Rent this article for
USD
10.1118/1.2841939
/content/aapm/journal/medphys/35/4/10.1118/1.2841939
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/4/10.1118/1.2841939

Figures

Image of FIG. 1.
FIG. 1.

A square focused ultrasound transducer with radius of curvature of with driving frequency of and side length of . The transducer is split into four equal square elements and driven with different modes to form different focal power patterns. (a) Three focal power patterns on the focal plane produced by the transducer. (b) A heating unit produced by switching the three focal modes with appropriate power weightings. The contour lines from inside to outside indicate TD equal to 300, 100, and , respectively.

Image of FIG. 2.
FIG. 2.

Schematic diagram of the proposed heating strategy. (a) The breast was modeled as a hemisphere with a radius of , the chest wall as a -thick slab, and the ultrasound transducer was tilted 45°. (b) The breast was sonicated from four directions with the focal center of each sonication away from the geometrical center of the planned target volume (PTV), and the sonication sequence was also indicated.

Image of FIG. 3.
FIG. 3.

(a) A prototype of the transducer in this study. (b) Focal pattern of mode 0 measured by hydrophone (normalized to peak value, unit: dB). (c) The set-up used for in vitro tissue model experiments in this study.

Image of FIG. 4.
FIG. 4.

Simulation results for heating a PTV centered at . (a–c) show the TD distributions on the , , and planes respectively. The contour lines from inside to the outside indicate TD equal to 300, 100, and , respectively.

Image of FIG. 5.
FIG. 5.

Simulation results for heating a PTV located at different locations. (a–c) show the TD distributions on the plane for the PTV centered at , , and , respectively.

Image of FIG. 6.
FIG. 6.

Simulation results for heating a PTV centered at with different heating strategies. (a) a single ultrasound transducer sonicated from four directions sequentially (total heating ); (b) four ultrasound transducers sonicated from four directions simultaneously; (c) four ultrasound transducers sonicated from four directions simultaneously, followed by 45° rotation of the transducers for a second set of four sonications.

Image of FIG. 7.
FIG. 7.

Thermal lesion on and planes, produced by single transducer with multidirectional heating.

Image of FIG. 8.
FIG. 8.

Simulation results for heating a PTV centered at using an experimental heating method. (a–c) TD distributions on , , and plane, respectively.

Image of FIG. 9.
FIG. 9.

The responses of peak temperatures in the PTV, surrounding tissue of PTV, and rib tissue for different sonication strategies. (a) Using a single transducer with sonications from four different directions sequentially, (b) using four transducers sonicated from four directions simultaneously, and (c) using four transducers sonicated from four directions simultaneously, followed by four sonications from transducers rotated 45°.

Tables

Generic image for table
TABLE I.

Phase combination and computed acoustic power weighting for each focal mode.

Generic image for table
TABLE II.

Properties of tissues used in the simulation (Refs. 14 and 18).

Generic image for table
TABLE III.

Detailed information of heating PTVs with various locations in simulations.

Generic image for table
TABLE IV.

Parameters of each mode used to form a heating unit in experiments.

Generic image for table
TABLE V.

Comparison of heating PTV centered at with different strategies in simulations.

Loading

Article metrics loading...

/content/aapm/journal/medphys/35/4/10.1118/1.2841939
2008-03-14
2014-04-23
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Split-focused ultrasound transducer with multidirectional heating for breast tumor thermal surgery
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/4/10.1118/1.2841939
10.1118/1.2841939
SEARCH_EXPAND_ITEM