Study on Property of Nonlinear Field of Limited-Diffraction X Waves

PDF(1665 KB)

ACTA ELECTRONICA SINICA ›› 2010, Vol. 38 ›› Issue (3) : 512-516.

学术论文

Study on Property of Nonlinear Field of Limited-Diffraction X Waves

DU Hong-wei;LU Wei;PENG Hu

Author information +

History +

Abstract

X waves may be used in ultrasound imaging to obtain very high frame rate. But the spatial resolution of the image with a linear imaging mode decreases as compared to conventional focused imaging. The nonlinear fields of limited-diffraction X waves are calculated and studied by solving the KZK equation using a time-domain numerical method. The result indicates that the nonlinear fields of broadband and band-limited X waves are both limited-diffraction beams. Moreover, the second harmonic component has narrower mainlobe and lower sidelobes than the fundamental field. Utilizing the second harmonic of X waves in ultrasound imaging, higher spatial resolution would be obtained throughout the entire imaging range. A theoretical analysis verifies the numerical calculation result.