Synthetic-aperture ultrasound tomography systems and methods using scanning arrays and algorithms configured to simultaneously acquire ultrasound transmission and reflection data, and process the data using ultrasound waveform tomography with a wave-energy-based preconditioning method for improved ultrasound tomography imaging.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with Government support under Grant No. MIPR0LDATM0144 from the Breast Cancer Research Program of DoD-Congressionally Directed Medical Research Programs and Contract No. DE-AC52-06NA25396 awarded by the Department of Energy. The Government has certain rights in the invention.
CROSS-REFERENCE TO RELATED APPLICATIONS
 This application is a 35 U.S.C. .sctn.111(a) continuation of PCT international application number PCT/US2013/024656 filed on Feb. 4, 2013, incorporated herein by reference in its entirety, which claims priority to, and the benefit of, U.S. provisional patent application Ser. No. 61/594,865, filed on Feb. 3, 2012, incorporated herein by reference in its entirety. Priority is claimed to each of the foregoing applications.
 The above-referenced PCT international application was published as PCT International Publication No. WO 2013/116851 on Aug. 8, 2013, incorporated herein by reference in its entirety.