Abstract: In medical image processing, image fusion technique is used to enhance the lesions or inertial component for better medical diagnosis and treatment. In this research, the fuzzy logic based medical brain MRI fusion technique is proposed. The edge pixels always have broad information than the other pixels. The mamdani fuzzy rules are constructed to fuse this edge oriented pixel information. The fused image has more complete information which is useful for human or machine perception. The fused image with such rich information will improve the performance of image analysis algorithms for medical applications. The final fused image of the method possesses a better performance with respect to values of PSNR, mean square error and entropy.