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김석현,곽중권 大邱大學校 科學技術硏究所 1998 科學技術硏究 Vol.5 No.3
This paper is intended as an introduction to the principles and computer simulation of parallel beam image reconstruction which may be classified as radon transform and circular convolution. The radon transform is a mapping from two dimensional image domain to a parameter domain. Therefore, high speed and data compression has been obtained. The radon transform leads to the projection or central slice theorem through a one dimensional or two dimensional fourier transform. The inverse radon transform can be implemented by filtering the projections in the fourier domain and back-projection. Circular convolutions are usually evaluated via FFT(fast fourier transform). The fast convolution advantages of this technique are that it is more efficient than the well-known fourier transform.