Iterative Retrospective Recovery of Full Synthetic Aperture Data from Focused Transmissions

Retrospective Encoding For Conventional Ultrasound Sequences (REFoCUS) enables recovery of the full-synthetic aperture (FSA) dataset from focused transmits while avoiding the drawbacks of single- and virtual-element transmissions. It was recently shown that a regularized inversion approach significantly improves the accuracy of the recovered FSA dataset over the REFoCUS method when applied to a walking-aperture transmit sequence. However, this approach becomes computationally burdensome when applied to walking aperture sequences on larger linear arrays. We present an iterative form of REFoCUS that improves FSA dataset recovery to better handle these cases.