  Unknown electric conductivities of human tissues is a common issue in medical
engineering. Electrical impedance tomography (EIT) is an imaging modality that
can be used to determine these conductivities in vivo from boundary
measurements. In this paper, we demonstrate that local conductivity values of
different skull segments can be solved from EIT measurements with the help of a
box constraint. Based on our numerical results, the accuracy of the results
depended on the locations of the current carrying electrodes and the signal to
noise ratio of the measurements. Particularly, the conductivity values of the
skull segments that located below the current carrying electrodes were
reconstructed more accurately.
