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Application of Modified Cell Scanning Technique in Exact Algorithm for Medical Diagnosis

Kabita Purkait, Kalyan Adhikary


A modified cell scanning technique has been proposed to calculate the number of cells which are illuminated by transmitting antenna beam of width 60 using elemental geometrical approach in a rectangular region of a biological target. The application of this new cell scanning technique in existing Exact Simultaneous Iterative Reconstruction Algorithm [1] for tomography is quite encouraging when verified in a normal and diseased biological model consisting of human organs like fat, muscle, kidney and muscle type materials. A comparative study of reconstructed images obtained by using previous cell scanning technique [2] and modified cell scanning technique are also presented here. The new cell scanning technique reduces the number of adjacent cells which are responsible for a change in the complex permittivity in a particular cell within the model and, thereby, reduces the error coming from the averaging effect of SIRT algorithm itself. The important aspect of this technique is that it takes few seconds to scan 700 cells each of 1sq. cm. in area and can be applied to a larger model with a greater number of cells than those used so far. In this paper, reconstruction of complex permittivity of target area is simulated by FORCE 209 FORTRAN [3] and then results are depicted by using colour gradation scale.


Cell scanning, exact algorithm, reconstruction, SIRT, tomography.

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