title: Coded excitation using biphase-coded pulse with mismatched filters for high-frequency ultrasound imaging.
abstract: 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.
authors.affiliation: Biomedical Engineering Department and NIH Transducer Resource Center, University of Southern California, Los Angeles, CA 90089, USA. changhoh@usc.edu
authors.forename: Chang-Hong
authors.initials: CH
authors.lastname: Hu
authors.forename: Ruibin
authors.initials: R
authors.lastname: Liu
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou
authors.forename: Jesse
authors.initials: J
authors.lastname: Yen
authors.forename: K
authors.initials: K
authors.lastname: Kirk Shung
mesh_terms: D000162:Acoustics; D003198:Computer Simulation; D007089:Image Enhancement; D012815:Signal Processing, Computer-Assisted; D014463:Ultrasonography / Q000295:instrumentation / Q000379:methods