Relation between Spatial Frequency Sampling Window and Lateral Resolution in Backward Propagation Acoustical Imaging
An acoustical imaging could be numerically reconstructed by several methods, one of which is Backward Propagation method. This method has many advantages especially it could be used in nearer distance where it is no longer in the region of Fresnel diffraction. Using traditional backward propagation method, the lateral resolution of the imaging system would be constrained by spatial sampling interval when the imaging distance is very short. This problem is discussed and the solution worked out using the method of data augmenting in spatial frequency domain. The details of the method and the results of computer simulant experiments are given in the paper.
KeywordsPoint Spread Function Lateral Resolution Acoustical Imaging Fresnel Diffraction Spatial Frequency Domain
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