Dr. Jaehee Song Profile

Dr. Jaehee Song

at Sogang Univ

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Proceedings Article | 14 March 2009 Paper

Harmonic Golay coded excitation using mutually orthogonal Golay codes and pulse inversion

Sang-Min Kim, Jae-Hee Song, Tai-Kyong Song

Proceedings Volume 7265, 72651F (2009) https://doi.org/10.1117/12.811550

KEYWORDS: Signal to noise ratio, Computer simulations, Ultrasonography, Signal processing, MATLAB, Reflectors, Tissues, Solids, Electronics engineering, Image resolution

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Coded excitation can improve the performance factors, such as SNR and CTR, of harmonic imaging with a low voltage transmit waveform. For these purposes, harmonic imaging methods using Golay codes with advantages in range sidelobe levels and implementation simplicity have been proposed. However, they require four transmit-receive (T/R) events to form each scan line. This work describes a new harmonic Golay coded excitation technique to overcome this problem. The proposed method can produce two scan lines through four T/R events using four pairs of codes. On the first T/R cycle, the first pair of codes is fired sequentially, one at a time, along each of the two scan lines, where the two codes are designed such that their second harmonic components are mutually orthogonal Golay codes. The same transmit sequence is carried out with the second pair of codes, each of which being 180 degrees out of phase with the corresponding one of the first pair of codes to remove the fundamental components by simply adding the two resulting received signals. The third and fourth T/R cycles are followed in the same manner, but with the codes whose harmonic components are composed of the complementary set of the mutually orthogonal Golay codes used in the first T/R cycle and their sign inverted codes, respectively. Consequently, the mutually orthogonal Golay codes and their complementary set of codes representing only the harmonic components are obtained after four T/R events. Finally, using the orthogonal and complementary properties, the coded harmonic signals along each scan line can easily be separated and compressed. Computer simulation results show that the proposed method can successfully perform pulse-inversion harmonic imaging to produce two scan lines simultaneously after four T/R events with coded sequences.

Proceedings Article | 13 March 2008 Paper

Harmonic quadrature demodulation for extracting the envelope of the second harmonic component

Sang-Min Kim, Jae-Hee Song, Tai-Kyong Song

Proceedings Volume 6920, 692017 (2008) https://doi.org/10.1117/12.770040

KEYWORDS: Demodulation, Ultrasonography, Signal processing, Solids, Computer simulations, Tissues, Linear filtering, Interference (communication), Electronic filtering, Filtering (signal processing)

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An efficient method for separating the harmonic component (2f0) from the fundamental component (f0) using harmonic quadrature demodulation is presented. In the proposed method, the focused ultrasound signal is mixed with cosine and sine signal waveforms of harmonic frequency 2f0 to produce the inphase and quadrature components, respectively. The quadrature component is Hilbert-transformed and then added to the inphase component. This process cancels out both the high and low frequency components of the mixed fundamental signal and the high frequency component of the mixed harmonic signal, leaving only the envelope of the harmonic signal at the base band. This signal is then fed to a low-pass filter to remove out of band noise. In summary, this method can extract the harmonic signal after a single transmit-receive event even when there exists frequency overlap between the f0 and 2f0 components. Hence, the proposed method is superior to the pulse inversion method which requires twice as many transmit-receive cycles as well as the conventional filtering method which has a bandwidth limitation. Therefore, one can find the proposed method useful not only for tissue harmonic imaging but also for contrast agent imaging in applications where high frame rate or low motion artifact is important. The proposed method is verified by both the analytic and computer simulation studies. For a stationary target, the difference between the estimated harmonic signals by the proposed and the pulse inversion methods is within 0.1%.

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