Abstract: A receiving medium comprising N components is assigned to a channel comprising N components respectively and provided along the circumference around which a rotating frame rotates. At a position facing the receiving medium corresponding to the rotation, the transmission medium of M components (M?2N, N represents an integer more than 2) are arranged separately in a line along the circumference of the rotating frame. A signal generation device produces the signal containing data relating to an object obtained by detection of the X-ray detector device. When the transmission medium is rotated according to the carrier signal to face any of the receiving medium, a switching device transmits the signal from the channel to one of the corresponding receiving medium. When the interval between the two adjacent transmission medium passes through the receiving medium, the signal from the same channel may be transmitted to the two adjacent transmission medium.