Microwave brain imaging typically has lower resolution due to its longer wavelength. This paper will propose a microwave brain tumour imaging method by fusion conventional microwave imaging techniques and real brain slices. The simulation of microwave signals is conducted in the CST Studio Suite software at the frequency range of 0.5–2 GHz. An array of eight antennas is set up around a human head model, and a tumour is inserted into the model. The collected frequency domain data is converted into the time domain. Next, four delay-and-sum image reconstruction algorithms are used to reconstruct the image. The generated images are then fused with a 2D slice of the head model to produce high-quality brain images. The fused images can visualize the tumour location while maintaining the brain structure.