Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a static field magnet, a gradient coil and a shim housing box. The static field magnet generates a static magnetic field in a space within a substantially cylindrical hollow. The gradient coil is provided inside the static field magnet and generates a gradient magnetic field. The shim housing box is capable of housing a metallic shim, the shim housing box being formed into a shape such that an attractive force of the static magnetic field applied to the shim housing box under magnetic excitation becomes smaller than a predetermined threshold.

Abstract: A magnetic resonance imaging device according to embodiments includes a substantially cylindrical-shaped coil structure. The coil structure includes a static field magnet generating a magnetostatic field in a space inside a cylinder, and a gradient coil disposed inside the cylinder of the static field magnet and generating a gradient magnetic field. In the coil structure, magnetic bodies are supported independently of the gradient coil, and are disposed near the center of the coil structure in the long axis direction in such a way as to extend along the circumferential direction of the substantially cylindrical shape.

Abstract: A magnetic resonance imaging device according to an embodiment includes a static magnetic field magnet that generates a static magnetic field, and a gradient coil in which a cooling pipe is laid. The cooling pipe is laid so as to preferentially cool a part near a uniform region in which uniformity of the static magnetic field is kept.

Abstract: A gradient magnetic-field coil according to an embodiment includes multiple units of coil members and a connecting member. In each of the coil members, a coil pattern is formed with a first nonmagnetic metal. The connecting member connects the coil members with each other. Moreover, at least a part of the connecting member is formed with a second nonmagnetic metal that is different from the first nonmagnetic metal.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a gradient coil configured to generate a gradient magnetic field in an image taking space. The gradient coil includes: a first coil member formed by using a first metal that is non-magnetic; and a second coil member connected to the first coil member and formed by using a second metal that is different from the first metal and is non-magnetic.

Abstract: According to one embodiment, a gradient coil unit for a magnetic resonance imaging apparatus includes gradient coils for forming gradient magnetic fields in mutually orthogonal three axis directions. At least one of the gradient coils includes a conductor part along a coil pattern and a holding part holding the coil pattern. A passage of a coolant is formed inside at least one of the conductor part and the holding part. The passage has a non-constant cross section.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes an imaging unit and a shield. The imaging unit is configured to perform a magnetic resonance imaging of an object by transmitting a radio frequency signal from a radio frequency coil in a condition that magnetic fields are formed by a gradient coil and a superconducting magnet respectively. The shield is configured to form a gradient magnetic field for the magnetic resonance imaging with the gradient coil and to prevent an ingress of a heat into the superconducting magnet.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a gradient coil and a coil cooling pipe. The gradient coil applies a gradient magnetic field onto a subject placed in a static magnetic field. The coil cooling pipe is provided to the gradient coil, and cools the gradient coil by circulating a coolant inside pipe. The coil cooling pipe is provided so as to extend from one end of the gradient coil in the direction toward the other end, then to bend, and to return to the one end along the shape of the gradient coil.

Abstract: A magnetic resonance diagnostic apparatus is configured in such a manner that: a high-frequency transmission coil transmits a high-frequency electromagnetic wave at a magnetic resonance frequency to an examined subject; a heating coil performs a heating process by radiating a high-frequency electromagnetic wave onto the examined subject at a frequency different from the magnetic resonance frequency; based on a magnetic resonance signal, a measuring unit measures the temperature of the examined subject changing due to the high-frequency electromagnetic wave radiated by the heating coil; and a control unit exercises control so that the measuring unit measures the temperature while the heating coil is performing the heating process, by ensuring that the transmission of the high-frequency electromagnetic wave by the high-frequency transmission coil and the radiation of the high-frequency electromagnetic wave by the heating coil are performed in parallel.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a static magnetic-field generating unit, a gradient magnetic-field generating unit, a plurality of metal shim plates in a plate shape, and a shim holding unit. The metal shim plates adjust uniformity of the static magnetic field. The shim holding unit holds the metal shim plates in a layered state. Each of the metal shim plates includes a convex having a certain angle at a certain position, and the metal shim plates are layered such that the convex of each one metal shim plate comes into contact with a back of the bent convex of another metal shim plate.

Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.

Abstract: A Magnetic Resonance Imaging (MRI) apparatus includes a static magnetic-field magnet that generates a static magnetic field in an imaging area in which a subject is to be placed; a main coil that is provided on the inner side of the static magnetic-field magnet, and applies a gradient magnetic field onto a subject placed in the static magnetic field; and a shield coil that is provided between the static magnetic-field magnet and the main coil, and shields a gradient magnetic field generated by the main coil. Moreover, a Radio Frequency (RF) coil side cooling system including a plurality of cooling pipes that circulates a coolant in pipe is provided on the inner side of the main coil.

Abstract: In an MRI apparatus, a detecting unit that includes a thermographic imaging equipment and a normal imaging camera detects a change in temperature of an imaging space from outside of the imaging space. A judging unit judges whether the imaging space has a point at a temperature greater than a threshold TH, and if the judging unit judges the imaging space has such a point with a temperature greater than the threshold, the apparatus stops the sequence that applies a gradient magnetic field to the subject.

Abstract: A magnetic resonance imaging apparatus has a storage unit and a processing unit. The storage unit stores correction data of a position coordinate, in which the position coordinate in the reconstruction FOV is caused to correspond to a position coordinate in a display FOV included in the reconstruction FOV based on an intensity of a gradient magnetic field. If both of a first position coordinate and a second position coordinate, which is further from the center of the reconstruction FOV, correspond to same position coordinate in the display FOV, the correction data is data for causing only the first position coordinate to correspond to the position coordinate in the display FOV. The processing unit corrects a reconstructed image based on the correction data and obtains an image of the display FOV.

Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.

Abstract: By using a temperature monitor, a coil-dedicated chiller measures an amount of change in temperature of cooling water flowing out from a cooling pipe of a gradient magnetic field, determines an amount of change in temperature of cooling water to be flowed into the cooling pipe in accordance with the measured amount of change in temperature of the cooling water; and changes the temperature of cooling water to be flowed into the cooling pipe of the gradient magnetic field based on the determined amount of change in temperature.

Abstract: A magnetic resonance diagnostic apparatus is configured in such a manner that: a high-frequency transmission coil transmits a high-frequency electromagnetic wave at a magnetic resonance frequency to an examined subject; a heating coil performs a heating process by radiating a high-frequency electromagnetic wave onto the examined subject at a frequency different from the magnetic resonance frequency; based on a magnetic resonance signal, a measuring unit measures the temperature of the examined subject changing due to the high-frequency electromagnetic wave radiated by the heating coil; and a control unit exercises control so that the measuring unit measures the temperature while the heating coil is performing the heating process, by ensuring that the transmission of the high-frequency electromagnetic wave by the high-frequency transmission coil and the radiation of the high-frequency electromagnetic wave by the heating coil are performed in parallel.

Abstract: A magnetic resonance imaging apparatus has a storage unit and a processing unit. The storage unit stores correction data of a position coordinate, in which the position coordinate in the reconstruction FOV is caused to correspond to a position coordinate in a display FOV included in the reconstruction FOV based on an intensity of a gradient magnetic field. If both of a first position coordinate and a second position coordinate, which is further from the center of the reconstruction FOV, correspond to same position coordinate in the display FOV, the correction data is data for causing only the first position coordinate to correspond to the position coordinate in the display FOV. The processing unit corrects a reconstructed image based on the correction data and obtains an image of the display FOV.

Abstract: An Magnetic Resonance Imaging (MRI) apparatus includes a static magnetic-field magnet that generates a static magnetic field in an imaging area in which a subject is to be placed; a main coil that is provided on the inner side of the static magnetic-field magnet, and applies a gradient magnetic field onto a subject placed in the static magnetic field; and a shield coil that is provided between the static magnetic-field magnet and the main coil, and shields a gradient magnetic field generated by the main coil. Moreover, a Radio Frequency (RF) coil side cooling system including a plurality of cooling pipes that circulates a coolant in pipe is provided on the inner side of the main coil.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a gradient coil and a coil cooling pipe. The gradient coil applies a gradient magnetic field onto a subject placed in a static magnetic field. The coil cooling pipe is provided to the gradient coil, and cools the gradient coil by circulating a coolant inside pipe. The coil cooling pipe is provided so as to extend from one end of the gradient coil in the direction toward the other end, then to bend, and to return to the one end along the shape of the gradient coil.