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Ongoing Project
Waveform Diversity on Hyperthermia Power
Optimization
The waveform diversity method based on
multi-input multi-output (MIMO) radar system design can generate diverse beam patterns
to match the desired power distribution by applying slowly varying narrowband
excitation signals to the array elements. The covariance matrix for excitation
signals is obtained from solving a semi-definite programming optimization
problem. The method effectively concentrates the therapeutic ultrasound within
the tumor target.
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Normalized
power distribution after optimization |
Temperature
elevation distribution after optimization |
Past Projects
Angular Spectrum Approach for Nearfield Pressure Simulations
Different implementations of the angular spectrum approach
are compared. The approaches include the spectral propagator with and without
angular restriction, and the spatial propagator, in both attenuating and
non-attenuating media.
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Nearfield pressure distribution for a rectangular piston |
Axial
pressure calculated by difference ASA methods |
Design and Simulation of Ultrasound Therapeutic
Arrays
Fast pressure field
simulations are performed with an optimal combination of the Fast Nearfield Method (FNM) and the Angular Spectrum Approach
(ASA).
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Spherically
focused phased array populated with circular pistons |
Pressure
field generated by this array |
Simulation of Nonlinear Pressure propagation via
Angular Spectrum Approach
Ultrasound/Radio-frequency Hybrid Applicator for
Breast Cancer Therapy