an electromagnetic tomography system for gathering measurement data pertaining to a human head includes an image chamber unit , a control system , and a housing . the image chamber unit includes an antenna assembly defining a horizontally - oriented imaging chamber and including an array of antennas arranged around the imaging chamber . the antennas include at least some transmitting antennas and some receiving antennas . the control system causes the transmitting antennas to transmit a low power electromagnetic field that is received by the receiving antennas after passing through a patient &# 39 ; s head in the imaging chamber . a data tensor is produced that may be inversed to reconstruct a 3d distribution of dielectric properties within the head and to create an image . the housing at least partially contains the antenna assembly and has a front entry opening into the imaging chamber . the head is inserted horizontally through the front entry opening and into the imaging chamber .