Methods to generate luminal organ profiles using impedance. When the channel quality of the control channel satisfies a predetermined condition, the communicating unit communicates at least the target circuit quality for the control channel, and the target circuit quality determining unit determines a target circuit quality for the received signal, based on the communicated target circuit quality for the control channel. At least one of the normal servo wedges includes a normal servo synch mark. Therefore, a plurality of scan signals is sequentially applied to the first sensor lines in the first direction, so that a plurality of touch events is simultaneously detected so that a plurality of touch positions may be detected.