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 3 of 3 for “"frequency compounding"”.
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Deep structure ultrasound imaging using fundamental and third harmonic coded excitation techniques
… resolution enhancement compression (REC) and frequency compounding, increases the axial resolution, lateral resolution, penetration depth and the contrast-to-noise ratio (CNR) for an ultrasonic imaging system. The thickness mode of piezoelectric transducers produces a signal that is resonant …
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Improving ultrasonic imaging using novel coded excitation techniques
… the voltage that could be applied at the center frequency. When doubling the bandwidth, the center frequency voltage was 6 dB below the band edges of the pre-enhanced chirp. Finally, the effects of attenuation were evaluated. Because of the attenuation, a larger shift in the center frequency due …
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Improving the Specificity of Medical Ultrasound Imaging Using Scattering Spectrum Matching
… opportunity to improve the image quality using frequency compounding methods, which have been traditionally used in speckle reduction at the expense of spatial resolution. However, this should be done with some understanding of the underlying scatterer spectrum in order to realize the promise of …