1. A system for measuring wall thickness in a region of interest included in a structure, comprising: a plurality of transducers each with a magnetic flux guide configured to: excite a preferred guided wave mode from a plurality of non-preferred guided wave modes that propagate at a non-preferred guided mode frequency that is substantially similar to a preferred guided wave mode frequency associated with the preferred guided wave mode, wherein the plurality of preferred guided wave modes propagate longitudinally in a A 0 mode and the plurality of non-preferred guided wave modes propagate longitudinally in a S 0 mode, minimize each spurious signal associated with the non-preferred guided wave modes by adjusting an inclination angle of a Lorentz Force field beneath each transducer with the magnetic flux guide to increase an amplitude ratio between the preferred guided wave mode and each spurious signal associated with the non-preferred guided wave modes, and generate the electrical signal that encodes the three-dimensional representation of the wall thickness loss distribution of the region of interest based on a change in the preferred guided wave mode from excitation to detection; 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.