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Supplementary Golay pair for range side lobe suppression in dual-frequency tissue harmonic imaging
Che-Chou Shen1, Chi Wu1, Jun-Kai Peng1
1Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.
This study introduces a new method using two Golay pairs to reduce artifacts in dual-frequency harmonic imaging. The technique effectively suppresses range side lobes and improves signal-to-noise ratio for clearer ultrasound images.
Area of Science:
- Medical imaging
- Ultrasound technology
- Signal processing
Background:
- Dual-frequency (DF) harmonic imaging uses second harmonic (2f0) and fundamental (f0) frequencies for spectral compounding.
- Phase-encoded Golay pairs enhance signal-to-noise ratio (SNR) but introduce range side lobe artifacts due to spectral cross-talk.
Purpose of the Study:
- To develop a method for suppressing range side lobes in DF harmonic imaging.
- To improve image quality by reducing artifacts caused by spectral cross-talk.
Main Methods:
- A supplementary Golay pair was developed to work with an original Golay pair.
- The supplementary pair reverses the polarity of third harmonic (3f0) interference and f0 signal, keeping the 2f0 signal unchanged.
- Echo summation and difference of the two Golay pairs cancel 3f0 and DC interference, respectively.
Main Results:
- Hydrophone measurements showed range side lobe level (RSLL) increases with signal bandwidth.
- The combined Golay pairs achieved 3 dB and 14 dB RSLL suppression for f0 and 2f0 signals.
- B-mode phantom imaging confirmed artifact suppression, with an 8 dB reduction in 2f0 imaging and improved harmonic SNR (8-10 dB).
Conclusions:
- Spectral cross-talk in Golay excitation causes significant range side lobe artifacts in DF tissue harmonic imaging.
- Two phase-encoded Golay pairs, used for echo summation or difference, are necessary to eliminate unwanted harmonic components and restore image quality.
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