20 citations · 52 across the 8 of their papers we have counts for
9 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…
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…
A Regularized Finite-Difference Approximation of Surface-restricted Emission and Reception Process in Acoustics with Application to Inverse Problems
Ashkan Javaherian
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…
Ray-based inversion accounting for scattering for biomedical ultrasound computed tomography
Ashkan Javaherian, Ben Cox
An efficient and accurate image reconstruction algorithm for ultrasound tomography (UST) is described and demonstrated, which can recover accurate sound speed distribution from aco…
Direct Quantitative Photoacoustic Tomography for realistic acoustic media
Ashkan Javaherian, Sean Holman
Quantitative photo-acoustic tomography (QPAT) seeks to reconstruct a distribution of optical attenuation coefficients inside a sample from a set of time series of pressure data tha…
A continuous adjoint for photo-acoustic tomography of the brain
Ashkan Javaherian, Sean Holman
We present an optimization framework for photo-acoustic tomography of brain based on a system of coupled equations that describe the propagation of sound waves in linear isotropic…
A Multi-Grid Iterative Method for Photoacoustic Tomography
Ashkan Javaherian, Sean Holman
Inspired by the recent advances on minimizing nonsmooth or bound-constrained convex functions on models using varying degrees of fidelity, we propose a line search multigrid (MG) m…