A fast volumetric reconstruction of the sound speed for aberration correction in photoacoustic tomography
This study demonstrates a fast, time-of-flights-based (TOF) approach for full-3D reconstruction of the sound speed from ultrasound data collected with the hybrid photoacoustic/ultrasound PAMMOTH scanner. TOF-based approaches iteratively fit the integral of slowness along the rays linking emitter-receiver pairs to the TOFs of the measured time traces. Our approach uses a novel, derivative-free iterative 3D ray-linking scheme for a fast computation of the trajectory of rays. We demonstrate the impact of using the reconstructed sound speed images for aberration correction in photoacoustic tomography with in-vivo data instead of using two homogenous sound speed for breast and water.
Univ. College London (United Kingdom)
Ashkan Javaherian obtained BSc and MSc degrees in Biomedical Engineering, respectively majoring in Bioelectric and Radio-medical engineering, from Shiraz university, a high-ranking University in Iran. He then obtained a PhD in Applied Mathematics at the University of Manchester in 2018 before he joined the Biomedical Ultrasound Group (BUG) at the Department of Medical Physics and Biomedical Engineering at University College London. His research interests are Photoacoustic and Ultrasound tomography. In BUG, he develops fast image reconstruction approaches for ultrasound portion of the hybrid photoacoustic/ultrasound PAMMOTH system. Specifically, he develops fast ray-based approaches for ultrasound computed tomography of the breast using simulated and in-vivo ultrasound data collected from the PAMMOTH system.