  Hybrid imaging techniques utilize couplings of physical modalities -- they
are called hybrid, because, typically, the excitation and measurement
quantities belong to different modalities. Recently there has been an enormous
research interest in this area because these methods promise very high
resolution. In this paper we give a review on hybrid tomography methods for
\emph{electrical conductivity} imaging. The reviewed imaging methods utilize
couplings between electric, magnetic and ultrasound modalities. By this it is
possible to perform high-resolution electrical impedance imaging and to
overcome the low-resolution problem of electric impedance tomography.
