2. Theory The CDM-MAET principle is shown in fig 1. the imaging process is described as follows: the imaging target is placed in a static magnetic field and excited by ultrasound. Particles in the target vibrate under the action of ultrasonic waves and are affected by the Lorentz force effection to generate the equivalent current source, which forms the current density in the imaging target, the variety of current density in target will lead to the change of space magnetic field, which can be detected by the coil outside the target. The induced voltage detected by coil can reflect the conductivity information of the target, and conductivity distribution images can be reconstructed by the conductivity reconstruction algorithm[13][14]。