An electrical impedance tomography device (1) includes an electrode array, including a plurality of electrodes (33) arranged spaced apart from one another, a signal feed unit (51) and a signal acquisition unit (50). A calculation and control unit (70) is configured to determine a situation with an axial twist angle of the electrode array on a thorax (34) of a human being and to provide a control signal (79), which indicates the situation with axial twist angle of the electrode array. The calculation and control unit (70) may be configured as a central unit or an array of distributed units (cloud computing) in order to determine and to provide the axial twist angle.