A method of identifying upon insertion into soft tissue a microelectrode of a set of three or more microelectrodes each comprising an electrically conductive body comprises providing the microelectrode with a unique metallic pattern of three or more sections separated from each other and disposed in an axial direction on the body and/or on one or more insulating layers on the body； inserting the microelectrode into the tissue simultaneously or consecutively with the other microelectrodes of the set； detecting the pattern by computer tomography (CT) or X- ray. Also disclosed are microelectrodes provided with unique patterns and sets of such microelectrodes and their use.
