TITLE:
Nonlinear Acoustic Shadow Method to Reduce Reverberation Artifact
AUTHORS:
Kei Fujisawa, Akira Asada
KEYWORDS:
Acoustic Shadow Method, Reverberation Artifact, Nonlinear Ultrasound, Parametric Array, Secondary Wave
JOURNAL NAME:
Journal of Flow Control, Measurement & Visualization,
Vol.4 No.2,
April
22,
2016
ABSTRACT: A novel technique for reducing reverberation artifact in acoustic shadow imaging using nonlinear ultrasound interaction, called nonlinear acoustic shadow method, has been developed and experimentally studied. In this technique, the conventional acoustic shadow method is modified by using the secondary wave generated by nonlinear interaction of two primary sound waves emitted from parametric array. Either conventional or nonlinear acoustic shadow imaging is carried out for aluminum square cylinder and the size of the shadow is compared. The result shows that the nonlinear acoustic shadow method reduces reverberation artifact inside the square cylinder and has better accuracy in the size measurement than conventional acoustic shadow method.