5 papers
A Reciprocity-Law-Compliant Photoacoustic Forward-Adjoint Operator
Ashkan Javaherian
We extend the forward-adjoint operator framework derived in our previous study to photoacoustic tomography (PAT). In that earlier work, the acoustic forward operator included a rec…
A Full-waveform Approximation of Finite-Sized Acoustic Apertures: Forward and Adjoint Wavefields
Ashkan Javaherian, Seyed Kamaledin Setarehdan
The acoustic wave equation governs wave propagation induced by either volumetric radiation sources, or by surface sources of monopole or dipole type. For surface sources, boundary…
Hessian-free Ray-Born Inversion for Quantitative Ultrasound Tomography of Weakly Heterogeneous Media
Ashkan Javaherian
This study presents a frequency-domain, Hessian-free ray-Born inversion method for quantitative ultrasound tomography, extending the author's previous Hessian-based approach. Both…
Introduction and Numerical Validation of an Open-Source MATLAB Package for Quantitative Ultrasound Tomography via Ray-Born Inversion
Ashkan Javaherian
We present a MATLAB package for reconstructing sound-speed images from transmission ultrasound data. The package is based on two-point ray tracing and implements two complementary…
The First In Vitro and In Vivo Validation of the Hessian-Free Ray-Born Inversion for Quantitative Ultrasound Tomography
Ashkan Javaherian
This study presents the first experimental validation of a Hessian-free ray-Born inversion technique for quantitative reconstruction of sound speed from transmission ultrasound dat…