PROJECTION DATA ERROR ESTIMATION AND CORRECTION FOR HIGH-RESOLUTION TOMOGRAPHIC ACOUSTIC MICROSCOPY

In scanning tomographic acoustic microscopy (STAM), projection error c orrection is necessary for high-resolution tomographic reconstruction. In this paper, both phase and alignment errors are examined. These er rors arise from several sources, including the quadrature receiver cha nnels, the unknown initial phase term, and any misalignment in the rot ational scan. The data acquisition process and the image formation alg orithm for the STAM are reviewed, and a description of error estimatio n and correction is also presented. Experimental results from the STAM are included to demonstrate the capability and effectiveness of the e rror-removal techniques. (C) 1998 Acoustical Society of America.