Abstract: In one embodiment, an MRI system includes at least one magnetic field assembly and at least one image generator. The at least one magnetic field assembly includes an open main magnet configured to generate a main magnetic field for dominantly determining a magnetic resonance frequency, a gradient coil configured to generate a gradient magnetic field, and an RF coil configured to generate a radio frequency magnetic field. The at least one image generator is configured to generate a magnetic resonance image of an object by using the main magnetic field, the gradient magnetic field, and the radio frequency magnetic field generated by the at least one magnetic field assembly. The main magnet is disposed between adjacent examination rooms. The main magnetic field generated by the open main magnet is commonly used in each of the adjacent examination rooms.

Abstract: A static magnetic field magnet according to any of embodiments includes: a superconducting coil generating a static magnetic field; and a radiation shield surrounding the superconducting coil. In the static magnetic field magnet, at least a surface on a gradient coil side of the radiation shield includes a peripheral portion that forms multiple concavity and/or convexity. Further, In the static magnetic field magnet, a shape of a cross-section perpendicular to a depth direction of each of the multiple concavity and/or convexity formed by the peripheral portion is polygonal or circular. It is preferable that the peripheral portion is configured to form the multiple concavity and/or convexity in a straight line.

Abstract: A static magnetic field magnet according to any of embodiments includes: a vacuum vessel; a radiation shield provided inside the vacuum vessel; a superconducting coil provided inside the radiation shield, the superconducting coil generating a static magnetic field; and a winding frame supporting the superconducting coil and including a heat-generation suppression shield having a surface layer on a gradient coil side and an inner layer on the superconducting coil side. In the static magnetic field magnet, the surface layer and the inner layer are structurally or functionally separated from each other, the surface layer is configured as a layer where an eddy current generated in the winding frame flows, and the inner layer is configured as a layer where an eddy current does not almost flow.

Abstract: In one embodiment, an MRI apparatus includes: a static magnet provided with a superconducting coil and configured to generate a static magnetic field having static magnetic field distribution in an open space outside the superconducting coil; control circuitry configured to adjust the static magnetic field distribution; and a reconstruction processing circuit configured to generate a magnetic resonance image on the basis of magnetic resonance signals emitted from an object that is at least partially placed in the open space outside the superconducting coil.

Abstract: According to one embodiment, an arrayed structure includes a cylindrical-shaped conductor layer and a cylindrical-shaped layer stack. The cylindrical-shaped layer stack is arranged on an inner periphery of the conductor layer and a plurality of frequency selective surfaces are arranged in layers and stacked. Each of the frequency selective surfaces has a plurality of elements which are periodically arranged. Each element of the plurality of elements is formed in such a manner that at least a portion of an edge of a first element that faces an adjacent element in the same layer is closer to a center of the first element than another portion of edge.

Abstract: In one embodiment, a receiving coil includes a plurality of coil elements, wherein: at least one of the coil elements includes a loop coil and a modified dipole disposed inside the loop coil; and the modified dipole includes a main dipole configured to receive a radio-frequency “RF” signal and output a reception signal and a parasitic element that includes a split ring having a gap in part of a ring shape.

Abstract: An X-ray CT apparatus of one embodiment includes an X-ray tube, a first X-ray detector, a rotator, and a second X-ray detector. The X-ray tube generates an X-ray. The first X-ray detector is arranged so as to face the X-ray tube and detects the X-ray that has transmitted through a subject. The rotator supports the X-ray tube and the first X-ray detector in a rotatable manner. The second X-ray detector detects a characteristic X-ray that is generated in accordance with a substance in the subject.

Abstract: In one embodiment, a receiving coil includes at least one coil element that can simultaneously receive a plurality of magnetic resonance signals having different frequencies, wherein a resonance structure for the different frequencies is provided in a single plane in each of the at least one coil element.

Abstract: In one embodiment, an MRI apparatus includes: a current-driven magnet configured to generate a magnetic field that predominantly determine a magnetic resonance frequency; a detector configured to detect a position of an object to be imaged in a movable state in the magnetic field; and control circuitry configured to set an imaging region of the object depending on a motion of the object by controlling a drive current of the current-driven magnet based on the detected position of the object.

Abstract: A magnetic resonance imaging apparatus includes sequence control circuitry and processing circuitry. In CEST imaging the sequence control circuitry performs a first sequence and a second sequence under different saturation pulse conditions. The first sequence is for acquiring first magnetic resonance signals corresponding to a first frequency region of a k-space and second magnetic resonance signals corresponding to a second frequency region of the k-space. The second sequence is for acquiring third magnetic resonance signals corresponding to at least the first frequency region. The processing circuitry assigns the third magnetic resonance signals and the second magnetic resonance signals to a single k-space generated for the second sequence. Frequency including the first frequency region is lower than frequency including the second frequency region.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry acquires an ambient temperature relating to a magnetic resonance imaging examination and determines an interlock value of a specific absorption rate (SAR) in accordance with the ambient temperature.

Abstract: In one embodiment, a Magnetic Resonance Imaging (MRI) apparatus includes: an RF coil configured to perform A/D conversion on a magnetic resonance (MR) signal received from an object and wirelessly transmit the MR signal; a main body configured to wirelessly receive the MR signal and generate a system clock; first communication circuitry configured to transmit the system clock by surface electric field communication using electric field propagation along a body surface of the object; and second communication circuitry provided in the RF coil and configured to receive the system clock transmitted by the surface electric field communication, wherein the RF coil is configured to operate based on the received system clock.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a static magnetic field magnet, a plurality of radio frequency coils, and processing circuitry. The static magnetic field magnet generates a static magnetic field having a magnetic field strength that changes spatially. The plurality of radio frequency coils receive a nuclear magnetic resonance signal generated from a subject by an influence of a radio frequency pulse transmitted to the subject, the subject being placed in the static magnetic field having a magnetic field strength that changes spatially. The processing circuitry controls each of the plurality of radio frequency coils to receive the nuclear magnetic resonance signal at each of a plurality of frequencies tuned according to at least a distribution of the static magnetic field.

Abstract: According to one embodiment, an arrayed structure includes a cylindrical-shaped conductor layer and a cylindrical-shaped layer stack. The cylindrical-shaped layer stack is arranged on an inner periphery of the conductor layer and a plurality of frequency selective surfaces are arranged in layers and stacked. Each of the frequency selective surfaces has a plurality of elements which are periodically arranged. Each element of the plurality of elements is formed in such a manner that at least a portion of an edge of a first element that faces an adjacent element in the same layer is closer to a center of the first element than another portion of edge.

Abstract: In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being configured to be disposed close to an abject; a signal generator configured to generate a high-frequency signal; a coupling-amount detection circuit configured to detect coupling amount of near-field coupling due to an electric field between the object and the at least one antenna by using the high-frequency signal; and a displacement detection circuit configured to detect a physical displacement of the object based on change in the coupling amount of near-field coupling.

Abstract: In one embodiment, an MRI system includes at least one magnetic field assembly and at least one image generator. The at least one magnetic field assembly includes an open main magnet configured to generate a main magnetic field for dominantly determining a magnetic resonance frequency, a gradient coil configured to generate a gradient magnetic field, and an RF coil configured to generate a radio frequency magnetic field. The at least one image generator is configured to generate a magnetic resonance image of an object by using the main magnetic field, the gradient magnetic field, and the radio frequency magnetic field generated by the at least one magnetic field assembly. The main magnet is disposed between adjacent examination rooms. The main magnetic field generated by the open main magnet is commonly used in each of the adjacent examination rooms.

Abstract: A radio frequency coil according to an embodiment is configured to receive a magnetic resonance signal from an examined subject. The radio frequency coil includes an expandable and contractible first element and an expandable and contractible second element. The radio frequency coil has an overlap region where a first loop formed by the first element overlaps with a second loop formed by the second element. The ratio of the area of the overlap region to the area of the region enclosed by the first loop changes in accordance with expansion/contraction of the first element forming the first loop. The first element and the second element include liquid metal in at least a part thereof.

Abstract: In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being disposed close to an object; a signal generator configured to generate a radio-frequency (RF) signal; and a displacement detection circuit configured to detect a physical displacement of the object based on the RF signal, wherein the at least one antenna includes: a dipole antenna having a feeding point to be supplied with the RF signal, the feeding point being positioned in a center of the dipole antenna; a coaxial line configured to supply the RF signal to the feeding point; and a conductor element that has a ¼ wavelength and is short-circuited on one end to an outer conductor of the coaxial line.

Abstract: In one embodiment, an MRI apparatus includes: a current-driven magnet configured to generate a magnetic field that predominantly determine a magnetic resonance frequency; a detector configured to detect a position of an object to be imaged in a movable state in the magnetic field; and control circuitry configured to set an imaging region of the object depending on a motion of the object by controlling a drive current of the current-driven magnet based on the detected position of the object.

Abstract: According to one embodiment, a coil element includes an extendable and contractible coil and a capacitor. The capacitor is connected to the coil and has an electrostatic capacity which changes due to a physical change in response to extension or contraction of the coil.