IMAGE-RECONSTRUCTION WITH ACOUSTIC MEASUREMENT USING DISTORTED BORN ITERATION METHOD

The distorted Born iterative method (DBIM) is applied to solve electro magnetics and ultrasonics inverse scattering problems. First, we use t he DBIM to process the data, which are the scattered fields from two-d imensional cylinders with arbitrary cross section. From this simulatio n, we confirmed that the first-order Born approximation can be applied to larger objects as long as the phase change of a wave passing throu gh the object due to its presence is smaller than a limit. Then we app lied DBIM to process the ultrasonic measurement data. Images for a bal loon and an egg that are immersed in water have been reconstructed and compared with those from the first-order diffraction tomography (DT).