DESIGN OF AN ACOUSTICAL IMAGING OPERATOR BASED ON THE SINGULAR-VALUE DECOMPOSITION METHOD

A new imaging operator has been developed for acoustical imaging using a 2ch m-sequence encoding array transducer. The new imaging operator has the ability to correct the poor orthogonal property of a transfer matrix. Moreover, images with many image points have been reconstructe d by the new imaging operator. The new imaging operator has been compo sed on he basis of the singular-value decomposition (SVD) of the trans fer matrix in the frequency domain. Characteristics of the new imaging operator are discussed by simulating the two-dimensional point spread functions (2-D PSFs). An image with a high dynamic value was obtained for a single object on the sampling image points by the method. Moreo ver, the method was able to reconstruct the image of the existing obje ct outside the sampling image points.