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Cấu trúc
Title
Contents
Preface
Abstract
Acknowledgements
Nomenclature
List of Figures
List of Tables
0 Introduction
0.1 Potential advantages of coded excitation
0.2 Literature Review
0.3 Thesis structure
1 Modulated signals
1.1 Introduction
1.2 Signal basics
1.3 Complex notation of narrowband signals
1.4 Correlation integrals
1.5 Waveform parameters and the uncertainty principle
1.6 The time-bandwidth product (TB)
2 Pulse compression and the ambiguity function
2.1 Filtering using complex notation
2.2 The matched filter
2.3 Generalized matched filter
2.4 Matched filter receiver in ultrasound imaging
2.5 The ambiguity function and its properties
2.6 Classification of pulse compression waveforms
2.7 Resolution in a matched filter receiver
2.8 Mismatched filtering
2.9 Optimal filtering in speckle
2.10 Appropriate compression waveforms and filters for ultrasound imaging
3 The linear FM signal and other FM waveforms
3.1 The linear FM signal
3.2 Spectrum of the linear FM signal
3.3 Symmetry properties and their implications
3.4 The matched filter response and the ridge ambiguity
3.5 Mismatched filtering
3.6 Gain in signal to noise ratio
3.7 Non-linear FM modulation
4 Weighting of FM signals and sidelobe reduction for ultrasound imaging
4.1 Weighting in time and frequency domain
4.2 Weighting functions and tapering
4.3 The effect of the ultrasonic transducer on pulse compression
4.4 Fresnel ripples and paired-echoes sidelobes
4.5 Amplitude and phase predistortion
4.6 Proposed excitation/compression scheme
5 Phase-modulated signals
5.1 Phase modulation
5.2 Binary sequences
5.3 Polyphase codes
5.4 Hadamard matrices
5.5 Sidelobe reduction for phase-encoded sequences
5.6 Disadvantages of phase-coding for ultrasound imaging
6 Ultrasound imaging with coded excitation- Simulation results
6.1 Intensity considerations
6.2 Expected signal-to-noise ratio improvement
6.3 Imaging with linear FM signals- Simulation results using Field II
6.4 Imaging with non-linear FM signals
6.5 Imaging with complementary codes
6.6 Evaluation of resolution and compression
6.7 Pulse compression and array imaging
7 Clinical evaluation of coded imaging
7.1 Experimental setup
7.2 Phantom images with coded excitation
7.3 Clinical images with coded excitation
8 Waveform diversity for fast ultrasound imaging
8.1 Waveform diversity for the FM signal
8.2 Frequency division
8.3 Cross-correlation (CC) of binary codes
9 Fast coded array imaging
9.1 Linear array coded imaging
9.2 Other firing and coding strategies
9.3 Synthetic transmit aperture (STA) imaging
9.4 Literature review on SNR improvement methods in STA imaging
9.5 Proposed STA coded imaging using Hadamard and FM space-time encoding
9.6 STA imaging with double frame rate using orthogonal FM signals
9.7 Evaluation of SNR in coded STA imaging
10 Fast ultrasound imaging using pulse trains
10.1 Pulse trains
10.2 Ambiguity function of pulse trains
10.3 FSK modulation and Costas arrays
10.4 The linear FM pulse train (QLFM-FSK)
10.5 Fast imaging with pulse trains
10.6 A New Coding Concept
10.7 Coherent processing of pulse trains
10.8 Simulated images using pulse train excitation
10.9 Possible alternative imaging strategies
11 Conclusions
A Relevant publications
A.1 Potential of coded excitation in medical ultrasound imaging
A.2 An effective coded excitation scheme based on a predistorted FM signal and an optimized digital filter
A.3 Clinical use and evaluation of coded excitation in B-mode images
A.4 Space-Time Encoding for High Frame Rate Ultrasound Imaging
Bibliography
Index
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