In this paper, a study of existing Exact Algorithm on microwave tomography of high contrast biological model for different sets of transmitting beamwidth has been proposed. Quantitative results of reconstructed images of normal semi human sized numerical model are also presented to exhibit the range of perturbations of complex permittivity of biological tissues can be adapted by the algorithm. The aforesaid algorithm is also applied to detect the diseased portion of the numerical model. A priori information helps to detect precisely the diseased portion after its preliminary detection by the algorithm has been suggested here with the help of a percentage average error.