Modification in Field Measurement Applied on Exact Algorithm for Biomedical Imaging

A modification has been proposed by the authors to calculate the field strength at the cells of a biological target which is illuminated by a transmitting array antenna with a beam width of 6 0 . The biological target is divided into large number of cells so that complex permittivity and electric fields are assumed to be constant in the small area of each cell. The electric fields are calculated at the cells which are under the illuminated zone of a transmitting beam. The electric fields are assumed to be zero in those cells which are outside the coverage zone of the said transmitting beam. Whereas in the previous cases, all the cells of the biological target are considered to be illuminated by the beam. For efficient reconstruction, narrowest possible beam is required. This modified method of field measurement when applied on a semi-human sized biological model consisting of human organs like fat, muscle, kidney and muscle type material improves the reconstructed complex permittivity value of the biological target. A comparative study of reconstructed image obtained by previous field measurement technique and improved field measurement technique are presented in this paper. Reconstruction of complex permittivity of target area is simulated using Force 209 FORTRAN and results are depicted by using colour gradation scale.