Sound Field Directivity Correction in Synthetic Aperture Algorithm for Medical Ultrasound (original) (raw)

Acoustical Imaging, 2012

Abstract

ABSTRACT The paper presents modified multi-element synthetic transmit aperture (MSTA) method for ultrasound imaging with RF echoes correction taking into account the influence of the element directivity, which property becomes significant as the element width becomes commensurable with the wavelength corresponding to the nominal frequency of the transmit signal. The angular dependence of the radiation efficiency of the transmit-receive aperture is approximated by a far-field radiation pattern resulting from the exact solution of the corresponding mixed boundary-value problem for periodic baffle system. The directivity is calculated at the nominal frequency of the excitation signal and is incorporated into the conventional MSTA algorithm. Numerical experiments performed in MATLAB® environment using data simulated by FIELD II program as well as measurement data acquired using the Ultrasonix SonixTOUCH Research system are shown. The comparison of the results obtain by the modified and conventional MSTA methods is given which reveals significant improvement of the image quality, especially in the area neighboring to the transducer's aperture, and increase of the visualization depth at the same time.

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