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Technical Ultrasound Imaging Using Coded Signals
Posted on 2010-06-02
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More Ultrasound Imaging Using Coded Signals By Thanassis Misaridis Modulated (or coded) excitation signals can potentially improve the quality and increase the frame rate in medical ultrasound scanners. The aim of this dissertation is to investigate systematically the applicability of modulated signals in medical ultrasound imaging and to suggest appropriate methods for coded imaging, with the goal of making better anatomic and flow images and threedimensional images. On the first stage, it investigates techniques for doing high-resolution coded imaging with improved signal-to-noise ratio compared to conventional imaging. Subsequently it investigates how coded excitation can be used for increasing the frame rate. The work includes both simulated results using Field II, and experimental results based on measurements on phantoms as well as clinical images. Initially a mathematical foundation of signal modulation is given. Pulse compression based on matched filtering is discussed. Correlation and compression properties of coded signals are shown to depend on a single parameter of the coded signals: the time-bandwidth product. It is shown that, due to attenuation in the tissues, the matched flter output is related to the ambiguity function of the excitation signal. Although a gain in signal-to-noise ratio of about 20 dB is theoretically possible for the time-bandwidth product available in ultrasound, it is shown that the effects of transducer weighting and tissue attenuation reduce the maximum gain at 10 dB for robust compression with low sidelobes.
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