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چکیده
Over the past few decades, the propagation of acoustic signals through the human body has found application in medical imaging as well as the treatment of various ailments. Also, many new applications are being continually developed. As the demand for medical ultrasonic devices increases, so does the demand for reliable methods of characterizing the pressure output of the ultrasound transducers. Currently, every focal region is characterized at every transducer voltage setting by directly measuring the acoustic pressure in a water bath. This process is highly time consuming, ultimately increasing the cost and development time for each transducer. In order to reduce this measurement time, there is a desire to linearly extrapolate the focal pressures from the applied voltage settings. Ideally, the manufacturer would measure the pressure for one voltage setting and then extrapolate to find the pressure for all other voltage settings. Unfortunately, sound propagation is a nonlinear phenomenon restricting the range of inputs over which linear extrapolation can be performed. The goal of this thesis was to determine if a reliable nonlinear indicator could be determined to measure the amount of nonlinearity in the acoustic waveform at the focus. The diagnostic ultrasound equipment manufacturer would then know over which applied voltages linear extrapolation would be valid.
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تاریخ انتشار 2002