An electromagnetic tomographic system for imaging a human head includes a base, an imaging chamber, at plurality of antennas, a plurality of antenna controllers, and an image processing computer system. The imaging chamber is supported on the base and defines an imaging domain in that receives the head. The antennas are supported by the imaging chamber and encircle the imaging domain. Each controller is dedicated to a respective antenna and includes RF transceiver circuitry having a transmit side and receive side that are alternately connected to the antenna using an RF switch. In operation, while one antenna is transmitting an electromagnetic signal into the imaging domain, a plurality of the antennas are simultaneously receiving the signal after passing through the imaging domain. The received signals of the plurality of antennas are simultaneously measured. Data representative of the measure electromagnetic signals is output by the controllers and used for image processing.