Nonlinear ultrasonic imaging with X wave

Hongwei Du; Wei Lu; Huanqing Feng

doi:10.1117/12.831324

30 October 2009 Nonlinear ultrasonic imaging with X wave

Hongwei Du, Wei Lu, Huanqing Feng

Proceedings Volume 7494, MIPPR 2009: Multispectral Image Acquisition and Processing; 74940C (2009) https://doi.org/10.1117/12.831324
Event: Sixth International Symposium on Multispectral Image Processing and Pattern Recognition, 2009, Yichang, China

Abstract

X wave has a large depth of field and may have important application in ultrasonic imaging to provide high frame rate (HFR). However, the HFR system suffers from lower spatial resolution. In this paper, a study of nonlinear imaging with X wave is presented to improve the resolution. A theoretical description of realizable nonlinear X wave is reported. The nonlinear field is simulated by solving the KZK nonlinear wave equation with a time-domain difference method. The results show that the second harmonic field of X wave has narrower mainlobe and lower sidelobes than the fundamental field. In order to evaluate the imaging effect with X wave, an imaging model involving numerical calculation of the KZK equation, Rayleigh-Sommerfeld integral, band-pass filtering and envelope detection is constructed to obtain 2D fundamental and second harmonic images of scatters in tissue-like medium. The results indicate that if X wave is used, the harmonic image has higher spatial resolution throughout the entire imaging region than the fundamental image, but higher sidelobes occur as compared to conventional focus imaging. A HFR imaging method with higher spatial resolution is thus feasible provided an apodization method is used to suppress sidelobes.

Citation Download Citation

Hongwei Du, Wei Lu, and Huanqing Feng "Nonlinear ultrasonic imaging with X wave", Proc. SPIE 7494, MIPPR 2009: Multispectral Image Acquisition and Processing, 74940C (30 October 2009); https://doi.org/10.1117/12.831324

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KEYWORDS

Spatial resolution

Imaging systems

Ultrasonography

Transducers

Gaussian beams

Tissues

Diffraction

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