3D post-processing of pre-beamformed RF data in the frequency-wavenumber domain
conference paper
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.
Topics
TNO Identifier
534865
ISBN
9781479981823
Publisher
IEEE Institute of Electrical and Electronics Engineers
Article nr.
7329423
Source title
IEEE International Ultrasonics Symposium, IUS 2015, 21-24 October 2015, Taipei, Taiwan
Collation
4 p.
Files
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