Phase Aberration Correction For Ultrasound Imaging In Temporal-Spatial Frequency Domain

Phase aberration due to tissues with inhomogeneous acoustic speeds is a major source for image degradation in medical ultrasound. In most phased array pulse-echo ultrasound systems, the delay used to steer and focus the beams are calculated assuming constant speed. In practice, however, the acoustic speed varies for di#erent types of tissue. In this paper, we present a method to estimate the phase errors between the elements of a linear array, based on signal representation in the spatial-temporal Fourier domain. Compared to the standard cross correlation methods used for time delay estimation, the proposed technique shows better performance. 1. INTRODUCTION The correction of phase errors due to propagation in inhomogeneous media has been the focus of a lot of research in medical ultrasound. These phase errors a#ect the quality of the images. In particular, the point spread function is broadened which lowers the resolution and blurs the image. In coherent imaging systems using linear a..