Abstract: A magnetic resonance imaging apparatus includes a static magnetic field generator, a gradient magnetic field generator, a transmission coil and a processing circuitry. The static magnetic field generator generates a static magnetic field. The gradient magnetic field generator generates a gradient magnetic field. The transmission coil applies an RF pulse to an object. The processing circuitry determines high frequency pulse power absorbed by other than the object in accordance with a volume of the object and computes a specific absorption rate (SAR) with the determined high frequency pulse power.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a radio frequency coil and a control signal transmitting unit. The radio frequency coil is that receives a magnetic resonance signal emitted from a patient as a result of an application of a radio frequency magnetic field thereto and to transmit the received magnetic resonance signal via a wireless communication. The control signal transmitting unit that transmits control information that collectively defines operations to be performed by the radio frequency coil during a predetermined repetition time period, to the radio frequency coil via a wireless communication, prior to the start of the operations performed during the predetermined repetition time period. Further, the radio frequency coil that receives the control information via a wireless communication and to perform the operations on the basis of the received control information.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a wireless communication unit, a radio frequency (RF) coil, and a specifying unit. The wireless communication unit includes an antenna and that transmits and receives a wireless signal through the antenna. The RF coil includes one or more antennas and that receives the wireless signal and to respond to the received wireless signal through the one or more antennas. The specifying unit that specifies the position and the orientation of the RF coil on the basis of a response result indicated by the response from the RF coil.

Abstract: According to one embodiment, a radio frequency coil unit includes cables, radio frequency coil elements and balun circuits. The cables correspond to channels. The radio frequency coil elements are directly or indirectly connected to the cables. The balun circuits suppress an influence of an unbalanced current flowing into partial radio frequency coil elements out of the radio frequency coil elements. A part of the cables pass through at least one of the balun circuits in contact with or in non-contact with at least one of the balun circuits.

Abstract: A coil pad according to one embodiment is a coil pad that is placed between a receiving coil and a subject. The receiving coil is mounted on the subject and receives a magnetic resonance signal emitted from the subject. The coil pad includes a pad opening and a vibrating portion. The pad opening is aligned with a coil opening included in the receiving coil and forms a through-hole between the coil opening and the subject. The vibrating portion vibrates with a medium that transmits vibration being filled therein.

Abstract: In a radio frequency coil according to an embodiment, electrical conductors and circuit elements are arranged. The radio frequency coil is configured so that the direction in which two of the electrical conductors forming a ring are connected together by one or more of the circuit elements positioned between the electrical conductors is different from the circumferential direction of the radio frequency coil.

Abstract: According to one embodiment, an MRI apparatus (20) includes a first RF coil device (700), a radio communication unit (640) and an image reconstruction unit (56). The first RF coil device is wirelessly connected to a second RF coil device (800), and receives a nuclear magnetic resonance signal wirelessly transmitted from the second RF coil device. The first RF coil device wirelessly transmits the nuclear magnetic resonance signal detect by the first RF coil device and the nuclear magnetic resonance signal obtained from the second RF coil device to the radio communication unit, via an induced electric field. The radio communication unit receives the nuclear magnetic resonance signals wirelessly transmitted from the first RF coil device via an induced electric field. The image reconstruction unit reconstructs image data on the basis of the nuclear magnetic resonance signals received by the radio communication unit.

Abstract: According to one embodiment, an MRI apparatus (20A to 20C) includes a supporting unit (80a to 80c), a first radio communication unit (200), a second radio communication unit (300A to 300C) and a power supply unit (320a, 320b, 550, 572, 574 and 610). The supporting unit supports a table inside a gantry (21). The first radio communication unit acquires an MR signal detected by an RF coil device (100A and 100B), and wirelessly transmits the MR signal. The second radio communication unit receives the MR signal wirelessly transmitted from the first radio communication unit. At least a part of the power supply unit is disposed inside a bed device (32) or inside the supporting unit. The power supply unit supplies consumed power of the RF coil device via the first radio communication unit, by wirelessly supplying electric power to the first radio communication unit.

Abstract: In one embodiment, an MRI apparatus (20A) includes an RF coil device (100A), a first radio communication unit (200A), a second radio communication unit (300), an image reconstruction unit (56) and a judging unit (412). The RF coil device detects an MR signal, and includes a data saving unit for storing the MR signal. The first radio communication unit wirelessly transmits the MR signal detected by the RF coil device, and the second radio communication unit receives the MR signal from the first radio communication unit. The image reconstruction unit reconstructs image data using the MR signal. The judging unit judges existence of a transmission error in radio communication between the first and second radio communication units. If the transmission error is present, the first radio communication unit wirelessly transmit the MR signal stored in the data saving unit to the second radio communication unit.

Abstract: In one embodiment, an MRI apparatus (20A and 20B) includes a first radio communication unit (200A to 200E), a second radio communication unit (300), an image reconstruction unit (56) and a table (34) for loading an object. The first radio communication unit obtains a nuclear magnetic resonance signal detected by an RF coil device (100), and wirelessly transmits the nuclear magnetic resonance signal in a digitized state via an induced electric field. The second radio communication unit receives the nuclear magnetic resonance signal via the induced electric field. The image reconstruction unit reconstructs image data based on the nuclear magnetic resonance signal. The table includes a supporting unit (500A to 500E) which detachably supports the first radio communication unit to the second radio communication unit so that an interval between the first and second radio communication units enables radio communication via the induced electric field.

Abstract: An RF coil unit of an embodiment includes a plurality of first coil elements each having a first main loop which receives a magnetic resonance signal and a plurality of second coil elements each having a second main loop and a sub-loop protruding from a portion of the second main loop. Any combination of two coil elements chosen from the plural first coil elements and the plural second coil elements is arranged in an overlap area where areas surrounded by one and another one of the two coil elements overlap in such a way that the overlap area is located in an area surrounded by the first main loop.

Abstract: In one embodiment, an RF coil device (90A) includes a base board (96), a belt member (94a), a first coil element (108a, 108b), a second coil element (104, 106) inside the base board, and a connecting unit (100, 102). Both ends of the belt member are respectively connected to mutually separated places on the base board, so that the center part of the belt member is located on the anterior surface of the base board. The belt member is curved to form “airspace between the center part thereof and the anterior surface for letting an arm pass through in interdigitation state”. The first coil element includes first and second partial coils inside the belt member, and becomes a loop coil element by their connection. The connecting unit detachably connects the base board to the belt member, and mutually connects the first and second partial coils in the interdigitation state.

Abstract: When an RF coil in a magnetic resonance imaging system includes a plurality of conductive members and circuit elements connected to the conductive members, at least part of each of the conductive members is formed to a thickness so as to dissipate heat generated from the circuit elements. Moreover, the magnetic resonance imaging system is configured to include a cooling unit that circulates cooling air over the surfaces of the circuit elements provided in the RF coil.

Abstract: When an RF coil in a magnetic resonance imaging system includes a plurality of conductive members and circuit elements connected to the conductive members, at least part of each of the conductive members is formed to a thickness so as to dissipate heat generated from the circuit elements. Moreover, the magnetic resonance imaging system is configured to include a cooling unit that circulates cooling air over the surfaces of the circuit elements provided in the RF coil.