Phase aberration correction using near-field signal redundancy-two-dimensional array algorithm [medical ultrasound]

Near field signal-redundancy phase-aberration correction algorithms have been proposed for linear arrays and phased arrays. These algorithms have also been successfully tested using in vivo data and data collected from phantoms. In this paper, a near field signal redundancy algorithm for two-dimensional arrays is proposed. This all-row-plus-two-column algorithm applies the near field signal redundancy algorithm for one-dimensional arrays to all rows and the first and last columns of the array. The results from the two column measurements are used to derive a linear term for each row measurement result. These linear terms are then incorporated into the row results to obtain a two-dimensional phase aberration profile. The algorithm and its ambiguity phase aberration profile, which is the difference between the true and the phase aberration profiles, are analyzed theoretically. The algorithm is also tested with simulated data sets. The simulation results agree well with theoretical analysis results and demonstrate that the all-row-plus-two-column algorithm can be used to implement the near field signal redundancy algorithm on two-dimensional arrays.