Time-Domain Reconstruction of the Speed of Sound in Ring-Array Ultrasound Computed Tomography with Randomized Super-Shots

Ring-array ultrasound computed tomography has recently achieved sufficient maturity for clinical applications like breast imaging. Image reconstruction is achieved with state of art iterative algorithms (full waveform inversion in the frequency domain). In this Letter, we consider a stochastic reconstruction in the time-domain. We introduce the notion of multiple super-shots and stochastic ensembles and test our inversion algorithm on publicly available experimental data. Our results show that image quality of a time-domain stochastic reconstruction may be comparable to image quality of a deterministic reconstruction in the frequency-domain, although the time-domain reconstruction is significantly slower.