A method and system for solving the inverse acoustic scattering problem
using an iterative approach with consideration of half-off-shell
transition matrix elements (near-field) information, where the Volterra
inverse series correctly predicts the first two moments of the
interaction, while the Fredholm inverse series is correct only for the
first moment and that the Volterra approach provides a method for exactly
obtaining interactions which can be written as a sum of delta functions.