Space-time imaging of transient ultrasound fields

Abstract

A new technique for imaging the full space-time complexity of transient ultrasound fields is presented. The theoretical basis of the method is developed in terms of the directivity spectrum, which is a generalization of the angular spectrum. The input field measurement set, acquired at a single distance from the transducer, consists of spatial projections of the field, which are directly measured with a large aperture hydrophone, as described in the text. The method compares very favorably with the angular spectrum approach and is devoid of evanescent waves. It allows computed pulse propagation over extended ranges, even in the backward direction from the measurement location. © 1997 John Wiley & Sons, Inc. Int J Imaging Syst Technol, 8: 45–51, 1997