1. A system for measuring wall thickness in a region of interest included in a structure, comprising: a transducer system configured to transmit a plurality of ultrasonic waves through the region of interest and convert the ultrasonic waves to propagated electrical signals that encode a three-dimensional representation of a wall thickness loss distribution of the region of interest; a pre-processing system configured to convert the three-dimensional representation encoded by the propagated electrical signals to a two-dimensional model for analysis of the wall thickness loss distribution; and an inversion system configured to generate a wall thickness loss distribution map from the two-dimensional model, wherein the wall thickness loss distribution map provides the wall thickness loss distribution for the region of interest.