Abstract: Provided is an RF shield that achieves a balance between an improved irradiation efficiency and suppression of eddy current-induced heat by a gradient magnetic field coil, while avoiding complexity of conductor pattern design for suppressing an eddy current by the gradient magnetic field coil. A cylindrical RF shield, which is one of elements constituting a high-frequency coil unit, is formed by rolling patterned conductive thin films formed on both front and back surfaces of an insulating sheet, front and back patterns of the patterned conductive thin film are mirror-symmetrical in a central axis direction of a cylinder, the front pattern is divided into two in the central axis direction, one side of two divided patterns is further divided into two in a circumferential direction, each of three independent pattern islands has slits such that strips are formed along to the cylinder axis direction, and each of the strips has a portion connected in an up-down direction at one location.

Abstract: To suppress eddy current generation by a gradient magnetic field while an RF shield has a function of reducing magnetic coupling of an RF coil with a gradient magnetic coil, the RF shield must be formed of a conductive material of a tiled or slitted strip-shaped thin plate. On the other hand, cooling must be performed to suppress temperature rise due to heat generation by the eddy current. Furthermore, to enlarge an opening through which a patient is inserted, the gradient magnetic coil, the RF coil, and the RF shield, which are located in a static field magnet and have roughly concentrically cylindrical shapes, are required to be reduced in thickness.

Abstract: When a mobile station 51 receives both a connection test signal, which is transmitted from a mobile station 50 just before communication is started, and a relay test signal, which is transmitted after a base station 52 receives the connection test signal transmitted from the mobile station 50, the mobile station 51 compares the reception levels of the received connection test signal and relay test signal. When the reception level of the connection test signal is higher than that of the relay test signal, the mobile station 51 starts direct communication with the mobile station 50, and when the reception level of the relay test signal is higher than that of the connection test signal, the mobile station 51 starts communication with the mobile station 50 via the base station 52.