Abstract: Key techniques for biologic magnetic induction tomography are analyzed. A highly precise phase detection method is implemented based on its principle. A stable programme control exciter and weak signal pickup circuits are designed, and a 16 channels magnetic induction tomography hardware system is finally completed. Preliminary imaging experiment based on the homogenous conductivity model is conducted, and the primary image is reconstructed by using the magnetic induction tomography reconstruction algorithm of our team. Experimental results show that the image of an object that has a low conductivity like biologic tissues can be reconstructed by magnetic induction tomography contactlessly. In the aspect of hardware design, the precision of phase detection and system stability are vital decisive factors for imaging quality.

Key words: multi channel, magnetic induction tomography, contactless, electrical impedance tomography