US 11,940,531 B2
Crosstalk-free source encoding for ultrasound tomography
Etienne Bachmann, Trenton, NJ (US); Gregory L. Davies, New York, NY (US); and Jeroen Tromp, Princeton, NJ (US)
Assigned to THE TRUSTEES OF PRINCETON UNIVERSITY, Princeton, NJ (US)
Filed by THE TRUSTEES OF PRINCETON UNIVERSITY, Princeton, NJ (US)
Filed on Apr. 16, 2021, as Appl. No. 17/232,642.
Claims priority of provisional application 63/011,369, filed on Apr. 17, 2020.
Prior Publication US 2021/0330287 A1, Oct. 28, 2021
Int. Cl. G01S 15/89 (2006.01); A61B 8/00 (2006.01); A61B 8/08 (2006.01); G01S 7/52 (2006.01)
CPC G01S 15/8977 (2013.01) [A61B 8/5207 (2013.01); G01S 7/52036 (2013.01); G01S 15/8952 (2013.01); G01S 15/8963 (2013.01); A61B 8/0825 (2013.01); A61B 8/587 (2013.01); G01S 7/52052 (2013.01); G01S 15/8993 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A system for ultrasound tomography, comprising:
a plurality of sources configured to transmit waves at one or more frequencies within a frequency bandwidth;
one or more receivers configured to receive the waves transmitted by the plurality of sources; and
a processor configured to:
(a) use a computerized representation of physical property maps of a medium that influence wave propagation;
(b) model all the sources and the receivers involved in a dataset;
(c) associate to each of the sources a sinusoidal source time function with a defined frequency of a set of frequencies regularly spaced within a bandwidth of interest; and
(d) perform a wave propagation simulation where sources are transmitting simultaneously for a time Tss+kΔτ, where Tss is a simulation duration for simulated wavefield to reach a steady state, k is an integer>=1, and Δτ=1/Δƒ
wherein the cost function comprises a source-encoded cost function that integrates contributions from all sources, and
wherein the cost function comprises waveform differences, phase and amplitude measurements, double-difference phase and amplitude measurements, cross-correlation traveltime measurements, or a generic adjoint tomography cost function.