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3D post-processing of pre-beamformed RF data in the frequency-wavenumber domain

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Author: Vos, H.J. · Neer, P.L.M.J. van · Verweij, M.D. · Jong, N. de · Volker, A.W.F.
Type:article
Date:2015
Publisher: IEEE Institute of Electrical and Electronics Engineers
Source:IEEE International Ultrasonics Symposium, IUS 2015, 21-24 October 2015, Taipei, Taiwan
Identifier: 534865
ISBN: 9781479981823
Article number: 7329423
Keywords: Electronics · 3D beamforming · Stolt migration · Synthetic aperture sequential beamforming · Optical transfer function · Signal to noise ratio · Beamforming technique · Frequency-wavenumber domains · Single element transducers · Threedimensional · Virtual sources · Fast Fourier transforms · Industrial Innovation · Observation, Weapon & Protection Systems · AS - Acoustics & Sonar · TS - Technical Sciences

Abstract

Three-dimensional (3D) high resolution beamforming is made more difficult by high data rates. This can be overcome by two-step imaging approaches such as the synthetic aperture beamforming technique. In this technique the first step significantly reduces the data rate by line-based delay and sum, whereas the second stage recombines the data to a high resolution volume image. The second step is implemented using 3D Fast Fourier Transforms and an interpolation step in frequency-wavenumber domain. A proof of concept is shown using a scanning 1 MHz focused single element transducer. The resulting volume image had a maximum -6dB point spread function of 3 mm throughout the entire depth of 135 mm. The signal-to-noise ratio was improved by 20dB in the far field.