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• W2158576013 abstract "This paper, the first from a series of three papers on the application of coded excitation signals in medical ultrasound, discusses the basic principles and ultrasound-related problems of pulse compression. The concepts of signal modulation and matched filtering are given, and a simple model of attenuation relates the matched filter response with the ambiguity function, known from radar. Based on this analysis and the properties of the ambiguity function, the selection of coded waveforms suitable for ultrasound imaging is discussed. It is shown that linear frequency modulation (FM) signals have the best and most robust features for ultrasound imaging. Other coded signals such as nonlinear FM and binary complementary Golay codes also have been considered and characterized in terms of signal-to-noise ratio (SNR) and sensitivity to frequency shifts. Using the simulation program Field II, it is found that in the case of linear FM signals, a SNR improvement of 12 to 18 dB can be expected for large imaging depths in attenuating media, without any depth-dependent filter compensation. In contrast, nonlinear FM modulation and binary codes are shown to give a SNR improvement of only 4 to 9 dB when processed with a matched filter. Other issues, such as depth-dependent matched filtering and use of filters other than the matched filter (inverse and Wiener filters) also are addressed." @default.
• W2158576013 created "2016-06-24" @default.
• W2158576013 creator A5042631584 @default.
• W2158576013 creator A5089334309 @default.
• W2158576013 date "2005-02-01" @default.
• W2158576013 modified "2023-10-11" @default.
• W2158576013 title "Use of modulated excitation signals in medical ultrasound. Part I: basic concepts and expected benefits" @default.
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• W2158576013 doi "https://doi.org/10.1109/tuffc.2005.1406545" @default.
• W2158576013 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15801307" @default.
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