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A novel approach combining dual frequency and split focus approaches is proposed to substantially enhance heating in treatment by using a prototype broadband splitfocus transducer. Using a dual-frequency mode in which the higher frequency is twice the lower frequency, the superimposition of two frequency pressures in the confocal region can enhance nucleation cavitation and inertial cavitation activity...
Golay-encoded excitation in combination with the third harmonic (3/„) transmit phasing is examined for both signal-to-noise ratio (SNR) and contrast-to-tissue ratio (CTR) improvements in harmonic imaging of contrast microbubbles. To produce the cancellation pair of tissue harmonic signal in 3/« transmit phasing, the phase of the bit waveform is properly designed for both the fundamental and the 3/«...
Thin film bulk acoustic resonator, grown based on the MEMS fabrication technology simultaneously, has become one of the most positive devices within the area of wireless communication application. FBAR has such distinct advantages as higher frequency, smaller volume, better power handling capabilities, higher Q-values and well compatibility with IC techniques. The paper briefly introduces the operational...
A structure of low loss surface acoustic wave filter with Single-Phase Unidirectional Transducers (SPUDTS) is described in this paper. In this structure, two single-phase unidirectional transducers are placed at both sides of one apodized transducer. The loss has caused by bidirectional acoustic wave can be canceled by unidirectional characteristic of SPUDTS. Moreover the frequency response of the...
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