Pitch-catch phase aberration correction for 3D ultrasound brain helmet

Having previously presented a system for simultaneous 3D ultrasound imaging via both temporal bone acoustic windows, we take advantage of this system´s scanning geometry to allow each matrix array to serve as a correction source for the opposing array. Aberration is estimated using cross-correlation of RF channel signals followed by least squares solution of the resulting overdetermined system. Delay maps are updated and real-time 3D scanning resumes. Saved volumes are also registered and fused offline. Mean residual error for this technique is 11.2 ns for 75 ns electronic aberrators. We also present results showing the efficacy of this technique for correcting physical and in vivo aberration.