Abstract: A superconducting coil device of an embodiment includes stacked pancake coils. Each of the stacked pancake coils includes an inner frame, a separator disposed outside the inner frame, and a superconducting wire wound part formed on the separator. The superconducting coil device further includes a position adjustment part configured to adjust relative positions of the stacked pancake coils.

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: 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: In one embodiment, a superconducting magnet includes: at least one set of coil segment including a first coil segment formed of a superconducting wire through which an electric current flows in a forward direction, and a second coil segment formed of the superconducting wire through which an electric current flows in a direction opposite to the forward direction; and at least one intermediate wiring provided between the first coil segment and the second coil segment and configured to connect the first coil segment and the second coil segment without disconnection and change directions of electric currents such that that the electric current flows through the first coil segment in the forward direction and the electric current flows through the second coil segment in a direction opposite to the forward direction.

Abstract: In one embodiment, a superconducting magnet includes: at least one primary superconducting coil configured to generate a primary static magnetic field by a persistent current flowing during a persistent current mode; at least one secondary superconducting coil configured to generate a secondary static magnetic field different from the primary static magnetic field in response to external control; and a static-magnetic-field control switch configured to (i) supply the secondary superconducting coil with part of the persistent current to generate the secondary static magnetic field by being closed in response to the external control during the persistent current mode and (ii) stop energization of the secondary superconducting coil and generation of the secondary static magnetic field by being opened in response to the external control during the persistent current mode.

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: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry is configured to calculate an allowable amount of heat input to a superconducting magnet, the allowable amount being allocated to each of a plurality of imagings scheduled during a target period. The processing circuitry is configured to determine an imaging condition based on the allowable amount in the each of the plurality of imagings.

Abstract: According to one embodiment, a MRI apparatus determines a first time during which a subsidiary power supply is capable of supplying power to a cooling device based on a capacity of the subsidiary power supply when power outage of a main power supply occurs, and determines a second time needed to demagnetize a superconducting magnet based on an excitation current of the superconducting magnet and a temperature of the superconducting magnet. The MRI apparatus determines starts ramp-down of the superconducting magnet after a third time based on the first time and the second time has elapsed from initiation of power outage of the main power supply.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry is configured to calculate an allowable amount of heat input to a superconducting magnet, the allowable amount being allocated to each of a plurality of imagings scheduled during a target period. The processing circuitry is configured to determine an imaging condition based on the allowable amount in the each of the plurality of imagings.

Abstract: According to one embodiment, a MRI apparatus determines a first time during which a subsidiary power supply is capable of supplying power to a cooling device based on a capacity of the subsidiary power supply when power outage of a main power supply occurs, and determines a second time needed to demagnetize a superconducting magnet based on an excitation current of the superconducting magnet and a temperature of the superconducting magnet. The MRI apparatus determines starts ramp-down of the superconducting magnet after a third time based on the first time and the second time has elapsed from initiation of power outage of the main power supply.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry is configured to calculate an allowable amount of heat input to a superconducting magnet, the allowable amount being allocated to each of a plurality of imagings scheduled during a target period. The processing circuitry is configured to determine an imaging condition based on the allowable amount in the each of the plurality of imagings.

Abstract: According to one embodiment, a MRI apparatus determines a first time during which a subsidiary power supply is capable of supplying power to a cooling device based on a capacity of the subsidiary power supply when power outage of a main power supply occurs, and determines a second time needed to demagnetize a superconducting magnet based on an excitation current of the superconducting magnet and a temperature of the superconducting magnet. The MRI apparatus determines starts ramp-down of the superconducting magnet after a third time based on the first time and the second time has elapsed from initiation of power outage of the main power supply.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry calculates a limit imaging condition based on one or more imaging parameters for determining an imaging condition, the limit imaging condition being an allowable limit relating to heat input to a superconducting magnet. The processing circuitry limits an input range of an imaging parameter input by an operator based on the limit imaging condition.

Abstract: A magnetic field adjusting method according to an embodiment includes: acquiring, by using a measuring device, first data related to a static magnetic field while a static magnetic field magnet is generating the static magnetic field having magnetic field intensity lower than rated magnetic field intensity required by an imaging process performed by a magnetic resonance imaging apparatus; and calculating, by using processing circuitry, a positional arrangement of a shim member used for correcting uniformity of the static magnetic field on the basis of the first data.

Abstract: A bone cement composition which contains titanium dioxide particles having a median diameter of 0.5 to 7.0 ?m as measured by a laser diffraction/scattering particle size distribution analyzer and a BET specific surface area of 0.5 to 7.0 m2/g as measured by a nitrogen adsorption method, and a base-forming component comprising a (meth)acrylate polymer and a (meth)acrylate monomer, wherein the content of the titanium dioxide particles is 5 to 50% by mass based on the total mass of the composition. The bone cement composition has bioactivity and is capable of forming a hardened material having a high mechanical strength.

Abstract: A bone cement composition which contains large-diameter (meth)acrylate polymer particles having an average particle diameter of 10 to 60 ?m, small-diameter (meth)acrylate polymer particles having an average particle diameter of 0.1 to 2.0 ?m, a (meth)acrylate monomer and a polymerization initiator, wherein the content of the small-diameter (meth)acrylate polymer particles is 5 to 30% by mass based on the total mass of the small-diameter (meth)acrylate polymer particles and the large-diameter (meth)acrylate polymer particles, and a part or a whole of the small-diameter (meth)acrylate polymer particles are contained in the form of aggregates having an average particle diameter of 30 to 50 ?m.

Abstract: The invention has as its objects the provision of a bone cement composition and a bone cement composition kit for obtaining the bone cement composition having bioactivity and capable of forming a hardened material having high mechanical strength practically required, and the provision of a bone cement formed material having both bioactivity and high mechanical strength practically required and a production method thereof. The bone cement composition of the invention contains titanium dioxide particles having a median diameter of 0.5 to 7.0 ?m as measured by a laser diffraction/scattering type particle size distribution analyzer and a BET specific surface area of 0.5 to 7.0 m2/g as measured by a nitrogen adsorption method, and a base-forming component comprising a (meth)acrylate polymer and a (meth)acrylate monomer, wherein the content of the titanium dioxide particles is 5 to 50% by mass based on the total mass of the composition.

Abstract: The invention has as its objects the provision of a bone cement composition, a bone cement composition kit for obtaining the bone cement composition, and a production method of a bone cement hardened material, which are short in doughing time that is a time required to become a state in which a good handling operation can be conducted, and have consequently capable of achieving a high working efficiency by shortening the time required before the handling operation is started. The bone cement composition of the invention contains large-diameter (meth)acrylate polymer particles having an average particle diameter of 10 to 60 ?m, small-diameter (meth)acrylate polymer particles having an average particle diameter of 0.1 to 2.0 ?m, a (meth)acrylate monomer and a polymerization initiator, wherein the content of the small-diameter (meth)acrylate polymer particles is 5 to 30% by mass based on the total mass of the small-diameter (meth)acrylate polymer particles and the large-diameter (meth)acrylate polymer particles.

Abstract: An artificial bone which is excellent in the ability to form bone in a living body, reliably thereof, and has high mechanical strength. The process comprises the steps of: mixing granules, composed of a titanium or a titanium alloy powder and an organic binder, with a particulate pore-forming material, pressure-molding the mixture to obtain a molded body, firing the molded body at 1200° C. to obtain a porous body, bringing the porous body into contact with an aqueous alkali solution, subsequently with water of 35° C. or higher for a period longer than that of contacting with the aqueous alkali solution and then heating the porous body at 100 to 650° C., preferably 200 to 600° C.

Abstract: An artificial bone which is excellent in the ability to form bone in a living body, reliably thereof, and has high mechanical strength. The process comprises the steps of: mixing granules, composed of a titanium or a titanium alloy powder and an organic binder, with a particulate pore-forming material, pressure-molding the mixture to obtain a molded body, firing the molded body at 1200° C. to obtain a porous body, bringing the porous body into contact with an aqueous alkali solution, subsequently with water of 35° C. or higher for a period longer than that of contacting with the aqueous alkali solution and then heating the porous body at 100 to 650° C., preferably 200 to 600° C.