Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"coded excitation"”.
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Improving ultrasonic imaging using novel coded excitation techniques
… on the source bandwidth. Recently, a novel coded excitation and pulse compression technique, known as Resolution Enhancement Compression (REC), was developed. REC enhances the -6 dB bandwidth of an ultrasonic imaging system. In this dissertation, the limitations of the REC technique were …
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Deep structure ultrasound imaging using fundamental and third harmonic coded excitation techniques
A novel coded excitation method, combining Golay coding with fundamental and third harmonic 1, 3 chirps with resolution enhancement compression (REC) and frequency compounding, increases the axial resolution, lateral resolution, penetration depth and the contrast-to-noise ratio (CNR) for an …
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Small lesion detection with resolution enhancement compression: a method of coded excitation/pulse compression
A novel coded excitation method, resolution enhancement compression (REC), increases the axial resolution and the echo signal-to-noise ratio (eSNR) for an ultrasonic imaging system. The REC technique was examined for its ability to improve lesion detectability. In addition to lesion detectability, …
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Applying synthetic aperture, coded excitation, and tissue harmonic imaging techniques to allow ultrasound imaging with a virtual source
… of focus. The second technique examined was coded excitation, a means of improving SNR while maintaining the axial resolution. The third technique was tissue harmonic imaging, which produces a narrower beamwidth and reduced sidelobes, and therefore can improve spatial resolution and contrast …
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Post-beamforming filtering for enhanced contrast resolution in medical ultrasound.
… reverberations. We have investigated the use of coded excitation, together with a 1D post-beamforming pseudoinverse filter, in improving the SNR and reducing reverberation leading to enhanced contrast resolution, especially for deeper target. Experimental demonstration of the algorithm was …
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Autonomous unmanned aerial vehicle for non-destructive testing
… improved inspection accuracy while applying a coded excitation to the ultrasonic measurement system to increase Signal-to-Noise Ratio. The maximum error was reduced from 0.83 mmto 0.66 mm in scenarios where the transducer was sub-optimally aligned.