Patent ID: 11948229
Assignee: MITSUBISHI ELECTRIC RESEARCH LABORATORIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A tomographic imaging system for reconstructing an image of an internal structure of an object, comprising
a transmitter configured to transmit an incident wavefield to an object, the object being embedded in an inhomogeneous reflectivity background medium with a known internal structure and the object occupying a background domain in the inhomogeneous reflectivity background medium;
a receiver configured to receive measurements of a total wavefield, wherein the total wavefield is a combination of the incident wavefield and a wavefield scattered by an unknown internal structure of the object and the known internal structure of the background domain, and wherein the object occupies a computational domain that is smaller than the background domain residing inside the inhomogeneous reflectivity background medium;
a memory configured to store a cross-domain operator and a residual measurement operator, wherein the cross-domain operator defines a propagation of the total wavefield from the computational domain of the object having the unknown internal structure of the object into a residual domain and back into the computational domain, wherein the residual domain occupies a portion of the background domain located outside the computational domain, and wherein the residual measurement operator defines a propagation of the total wavefield from the computational domain into the residual domain and back to the receiver;
a processor configured to reconstruct an image of the unknown internal structure of the object from the measurements by solving an optimization problem corresponding to the computational domain of the object subject to boundary conditions of the stored cross-domain and residual measurement operators, wherein the optimization problem is solved iteratively to minimize a difference between the measurements of the total wavefield and a wavefield synthesized using a measurement operator and a Green's function operator from the reconstructed image; and
an output interface configured to render the reconstructed image.