Frequency modulated pulse for ultrasonic imaging in an attenuating medium

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Title: Frequency modulated pulse for ultrasonic imaging in an attenuating medium
Author: Rao, Navalgund
Abstract: It is argued that the probability that ultrasound used at the intensities employed clinically will cause bioeffects characteristic of transient cavitation is immensely greater above a threshold peak intensity of the interrogating ultrasound pulse. Simulations and experiments in nonattenuating media show that a factor of 16 to 50 reduction in peak intensity is possible without sacrificing the signal primarily used for imaging, or the resolution. This factor depends on the effective time-bandwidth product of the frequency modulated pulse. However, in a frequency-dependent attenuating medium, such as soft tissue, this advantage could diminish. A linear-frequency and linear-phase model for attenuation was incorporated in the simulation process. The time-bandwidth product was evaluated for reflectors at various depths and as a function of the center frequency and bandwidth of the frequency-modulated pulse.
Description: Computer-Based Medical Systems, 1990., Proceedings of Third Annual IEEE Symposium on.
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Date: 1990

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