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Tissue harmonic imaging provides better spatial resolution by producing the image with the second harmonic component generated by nonlinear propagation in tissue. However, the spectral overlap between the transmitted signal and received second harmonic signal results in image artifacts and reduces the image quality. Conventional filtering techniques such as a bandpass filter can separate the second...
A pre-distortion by amplitude modulate (PDAM) method is evaluated for use in linear frequency modulated (LFM) coded harmonic imaging. LFM coded signals are known to boost the SNR of the low amplitude harmonics, but due to the nature of harmonic imaging, are located at inefficient regions of the transducer's bandwidth. As a consequence, the LFM signal is subjected to transducer-induced tapering which...
In ultrasound harmonic imaging with chirp coded excitation, the axial resolution can be improved by increasing the excitation signal bandwidth. However, increasing the bandwidth will cause overlapping between the received nonlinear second harmonic chirp component (SHCC) and the fundamental component. For the spectrally overlapping harmonics, signal decoding using the second harmonic matched filter...
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