Mikael Persson, professor of biomedical engineering, Department of signals and systems, Chalmers University of Technology
Mikael Elam, professor and consultant in clinical neurophysiology at the Sahlgrenska Academy at University of Gothenburg and the Sahlgrenska University Hospital
A microwave helmet is placed on the patient's head and the brain tissue is examined with the aid of microwave radiation. The system consists of three parts: a helmet-like antenna system that is put on the patient's head, a microwave unit and a computer that is used to control the equipment, data acquisition and signal processing.
Individual antennas in system transmit, in sequence, a weak microwave signals through the brain, while the other receiving antennas measure the reflected signals. Distinct structures and substances in the brain affect the microwave scattering and reflections in different ways and the received signals provides a complex pattern, as interpreted by using advanced algorithms.