Coded excitation using biphase-coded pulse with mismatched filters for high-frequency ultrasound imaging.
A scheme of using phase-coded excitation and mismatched filter compression for high-frequency ultrasound imaging is presented in this paper. Biphase-coded pulses were constructed to excite the transducer. Received signals were compressed with mismatched filters optimized by minimizing peak-sidelobe-level (PSL). Both simulation and experiments were carried out to demonstrate the advantage of this technique. The simulation results demonstrated a possible sidelobe reduction (<-90 dB) with a slightly decrease of the signal-to-noise ratio of less than 1 dB compared with the compression using matched filters alone. The experimental results showed about 14 dB SNR improvement as well as -40 dB sidelobe level when the Barker-13 code excitation with 3-cycle sinusoidal wave carrier was used.
Hu
Chang-Hong
CH
Biomedical Engineering Department and NIH Transducer Resource Center, University of Southern California, Los Angeles, CA 90089, USA. changhoh@usc.edu
Liu
Ruibin
R
Zhou
Qifa
Q
Yen
Jesse
J
Kirk Shung
K
K
D000162:Acoustics; D003198:Computer Simulation; D007089:Image Enhancement; D012815:Signal Processing, Computer-Assisted; D014463:Ultrasonography / Q000295:instrumentation / Q000379:methods