摘要:
A superconducting magnet of the present invention includes a switching element that closes its output side (operation side) when the voltage on its input side is smaller than a predetermined value and opens the output side when the voltage on the input side is larger than the predetermined value, wherein the input side is connected in parallel to a main coil circuit, and the output side of is connected in series to external magnetic-field disturbance compensation coils, for releasing the circuit of the disturbance compensation coil by closing the output side if the voltage on the input side is smaller than the predetermined value.
摘要:
A method and a device for identifying an upper surface and a lower surface of a component having asymmetric upper and lower outer shapes are provided. The components include, for example, disk-like, cylindrical, or annular components, more specifically engine parts having an orientation such as piston rings. In particular, a method and a device for identifying orientation of an item that hardly allows visual identification of the upper and lower surface. A disk-like, cylindrical, or annular component having asymmetric upper and lower outer shapes is placed on a reference surface having a reference block, an outer peripheral part of the component on the reference surface is brought into contact with the reference block, and identification of the upper and lower surface of the component is achieved in an inline system based on a gap created between the outer peripheral part of the component and the reference block, using a light source lighting device and a detection camera arranged across the reference block.
摘要:
A shim support guide jig includes a shim support guide pipe in which a guide passage for guiding the movement of a shim support is formed. In a state where a superconducting magnet has generated a static magnetic field, the designated shim support can be drawn out from the internal space of the superconducting magnet through the guide passage, and the designated shim support for which magnetic material shims have been arranged and adjusted can be inserted into the internal space through the guide passage. A magnetic field generation apparatus has the magnetic material shims arranged and adjusted using the shim support guide jig, and a magnetic resonance imaging equipment employs the magnetic field generation apparatus. Magnetic field adjustment methods for the magnetic field generation apparatus and for the magnetic resonance imaging equipment are performed using the shim support guide jig.
摘要:
A shim support guide jig includes a shim support guide pipe in which a guide passage for guiding the movement of a shim support is formed. In a state where a superconducting magnet has generated a static magnetic field, the designated shim support can be drawn out from the internal space of the superconducting magnet through the guide passage, and the designated shim support for which magnetic material shims have been arranged and adjusted can be inserted into the internal space through the guide passage. A magnetic field generation apparatus has the magnetic material shims arranged and adjusted using the shim support guide jig, and a magnetic resonance imaging equipment employs the magnetic field generation apparatus. Magnetic field adjustment methods for the magnetic field generation apparatus and for the magnetic resonance imaging equipment are performed using the shim support guide jig.
摘要:
A superconducting magnet of the present invention includes a switching element that closes its output side (operation side) when the voltage on its input side is smaller than a predetermined value and opens the output side when the voltage on the input side is larger than the predetermined value, wherein the input side is connected in parallel to a main coil circuit, and the output side of is connected in series to external magnetic-field disturbance compensation coils, for releasing the circuit of the disturbance compensation coil by closing the output side if the voltage on the input side is smaller than the predetermined value.
摘要:
A magnetic resonance imaging system is provided in which the two contradictory requirements, i.e., enhancing the feeling of being not confined by enlarging the subject-insertion space and decreasing magnetomotive force of the superconductive coils by bringing the superconductive coils as close as possible to a subject, can be met in a good balance. In a magnetic resonance imaging system that includes a superconductive electromagnetic device for generating a static magnetic field to be applied to a subject, a gradient-magnetic-field coil for forming a gradient magnetic field by tilting the magnetic-field strength of the static magnetic field, and a radio-frequency coil for transmitting a radio-frequency magnetic field to the subject and then receiving nuclear magnetic-resonance signals from the subject, a vacuum container for the superconductive electromagnetic device thereof has a recess; the gradient-magnetic-field coil and the radio-frequency coil thereof are accommodated in the recess; and a cosmetic cover that is fit into the recess and is supported by the wall surfaces of the recess is included therein.
摘要:
There are provided the steps of: measuring a magnetic field in a predetermined space; and performing shimming by arranging a plurality of ferromagnetic shims in a superconducting magnet. The step of shimming includes arranging the plurality of shims at positions that make the magnetic field homogeneous, based on a result of measurement in the step of measuring the magnetic field and that provide a predetermined value of an electromagnetic force caused by the magnetic field to act on the plurality of shims.
摘要:
A magnetic resonance imaging system is provided in which the two contradictory requirements, i.e., enhancing the feeling of being not confined by enlarging the subject-insertion space and decreasing magnetomotive force of the superconductive coils by bringing the superconductive coils as close as possible to a subject, can be met in a good balance.In a magnetic resonance imaging system that includes a superconductive electromagnetic device for generating a static magnetic field to be applied to a subject, a gradient-magnetic-field coil for forming a gradient magnetic field by tilting the magnetic-field strength of the static magnetic field, and a radio-frequency coil for transmitting a radio-frequency magnetic field to the subject and then receiving nuclear magnetic-resonance signals from the subject, a vacuum container for the superconductive electromagnetic device thereof has a recess; the gradient-magnetic-field coil and the radio-frequency coil thereof are accommodated in the recess; and a cosmetic cover that is fit into the recess and is supported by the wall surfaces of the recess is included therein.
摘要:
A read command having designated a bank, can be inputted from outside. A read command having designated a bank can be inputted from outside while an operation for reading from a memory array to a data buffer is being performed at the bank. Further, a read command having designated a bank is inputted from outside, and a buffer read command having designated a bank is inputted from outside while an operation for reading from a memory array to a data buffer is being performed at the bank, whereby reading from the data buffer of the bank to the outside is enabled.
摘要:
A method of the present invention includes: a step of shimming an MRI superconducting magnet in consideration of the magnetic field atmosphere of a use place; a step of generating a rated magnetic field in the MRI superconducting magnet thus shimmed, under an environment in which the magnetic field atmosphere of the use place is realized; and a step of installing the MRI superconducting magnet in the use place after the step of generating the rated magnetic field. This reduces possibility of occurrence of quench and improves stability in the MRI superconducting magnet.