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The following topics are dealt with: therapeutic ultrasound; beamforming; SAW system applications; high frequency transducers; cardiovascular imaging; NDE signal processing; acoustic wave biosensors; chemical sensors; acoustic filters; fluid sensors; cMUT imaging systems; piezoelectric materials, and other acoustic devices and applicatoins.
The mechanism behind pulsed high intensity focused ultrasound (pHIFU) effects leading to increased drug delivery is currently poorly understood. In this work, the thermal dose and peak temperatures associated with a typical pHIFU treatment were measured in mouse muscle. A non-ultrasonic hyperthermia (HT) treatment was then applied, designed to mimic the thermal component of the pHIFU treatment. The...
A preliminary study for advanced HIFU therapy system was performed which enabled echographic marking and enhancing of the ultrasonic energy absorption efficiency at site of interest. As a main component of this system, we are developing phase change nano-droplet, a liquid precursor of a microbubble that changes into a bubble upon applying ultrasonic pulses. In this study, we investigated the effect...
We honor the memory of our late IEEE colleague Robert Adler. Adler's accomplishments include an impressive body of scientific work and major inventions. The SAW touchscreen is his last innovation having a major impact on our daily lives. The authors, who worked with Robert Adler on touchscreen research, share their perspectives on his SAW touchscreen inventions. In addition to highlighting Robert...
Beamforming artifacts due to coarse discretization of imaging apertures represent a significant barrier toward the use of array probes in high frequency ultrasound (HFUS) applications. In this paper, we present a new design approach for two-dimensional (2D) regularized Pseudoinverse filters suitable for restoring imaging contrast in systems employing coarsely sampled arrays. The approach is based...
The cost and complexity of medical ultrasound imaging systems can be reduced by integrating the transducer array with an integrated circuit (IC). By incorporating some of the system's front-end electronics into an IC, bulky cables and costly system electronics can be eliminated. Here we present an IC for 3D intracavital imaging that requires few electrical connections but uses a large fraction of...
This paper describes the design and implementation of a 64-channel beamformer for a 50 MHz linear array for use in medical imaging. The results for a series of theoretical models comparing various beamforming algorithms are given. The final algorithm is a compromise solution, applying a simple linear interpolation algorithm to a data set acquired using 4x interleaved sampling. This allows for 12 bit,...
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