Tomographic reconstruction technique for pulsed-echo imaging

This article proposes a tomographic reconstruction technique using divergent ultrasonic waves of a circular arc wavefront which are formed by one-dimensional thin-phased array. The projection data which are obtained by phasing of transmitting and receiving signals are applied to the filtered back projection algorithm so that the image at the spherical surface is reconstructed. The experiments using a small steel sphere and a layer phantom of agar gel are performed using a commercially available phased-array system. The divergent waves are formed by the slit in the front of the array. As a result, images with a space-invariant, high-resolution unlike conventional B-scan image are obtained. © 1997 John Wiley & Sons, Inc. Int J Imaging Syst Technol, 8, 432–437, 1997