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Lead zirconate titanate piezoelectric films were integrated into prototype one-dimensional array transducers. The geometry used for transducer arrays is a xylophone-bar type with a length:width aspect ratio greater than 5:1 in order to isolate the desired resonance modes. The PZT and remaining films in the stack were patterned using ion-beam etching and partially released from the underlying silicon...
Sonophoresis for transdermal drug delivery(TDD) generally uses relatively low frequency ultrasound (e.g., <100 kHz). The main mechanism of sonophoresis is related to cavitation of bubbles trapped between ultrasound transducer and skin. Thus, enhancement of cavitation can lead to effective TDD. In this presentation, the efficacy of TDD with ultrasound contrast agent(UCA) was tested by animal experiments...
A fully custom designed CMOS transceiver chip for high frequency ultrasound imaging applications is described. The chip consists of nine transceiver channels with a programmable beamformer. On the chip, 8 bit 250 MS/s A/D converters digitize analog signals from the transducers and nine 3 Kbyte/channel SRAM store the digitized data for each of the nine channels. The chip was fabricated in a 0.35 mum...
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