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Magnetic resonance imaging device and gradient magnetic field coil

A technology of magnetic resonance imaging and gradient magnetic field, which is used in measuring devices, measuring magnetic variables, medical science, etc., and can solve the problems of image quality deterioration, inability to suppress the temperature rise of iron gaskets, and fat suppression deterioration.

Inactive Publication Date: 2015-10-14
TOSHIBA MEDICAL SYST CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the imaging area is near the center of the long-axis direction, the temperature rise of the iron spacer placed near this area has a particularly large influence, which may cause deterioration of fat suppression, N / 2 artifacts in EPI (Echo Planar Imaging), and image distortion other image quality degradation
However, in the layout of the cooling pipes in the conventional gradient magnetic field coil, the temperature rise of the iron spacer arranged near the center in the longitudinal direction cannot be suppressed.

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  • Magnetic resonance imaging device and gradient magnetic field coil
  • Magnetic resonance imaging device and gradient magnetic field coil
  • Magnetic resonance imaging device and gradient magnetic field coil

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no. 1 Embodiment approach

[0019] figure 1 It is a functional block diagram showing the configuration of the MRI apparatus 100 according to the first embodiment. Such as figure 1 As shown, the MRI apparatus 100 includes a static field magnet 101, a static field power supply 102, a gradient magnetic field coil 103, a gradient magnetic field power supply 104, an RF coil 105, a transmitting unit 106, a receiving unit 107, a bed 108, a sequence control unit 120, and a computer 130 . In addition, the subject P (for example, a human body) is not included in the MRI apparatus 100 . in addition, figure 1 The shown structure is just an example. Each part may be appropriately combined or configured separately.

[0020] The static field magnet 101 is a magnet formed in a hollow substantially cylindrical (including elliptical) shape, and generates a static magnetic field in a space inside the substantially cylindrical cylinder. The static field magnet 101 is, for example, a superconducting magnet or the like,...

no. 2 Embodiment approach

[0055] Next, a second embodiment will be described. In the second embodiment, as in the first embodiment, the cooling pipes are arranged so as to preferentially cool the vicinity of the uniform region where the uniformity of the static magnetic field is maintained. In addition, in the second embodiment, the starting position of the piping wound spirally is not adjusted, but the piping density is adjusted. The piping density is the density of the number of windings within a predetermined range. When comparing within the same range, the larger the number of windings, the higher the piping density, and the smaller the number of windings, the lower the piping density.

[0056] Figure 8 It is a conceptual diagram showing the piping layout of the cooling pipes in the second embodiment. Such as Figure 8 As shown, in the second embodiment, the cooling pipes are arranged such that the arrangement density near the center in the longitudinal direction of the gradient magnetic field...

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Abstract

A magnetic resonance imaging device (100) of an embodiment of the present invention is provided with a static magnetic field magnet (101) that generates a static magnetic field, and a gradient magnetic field coil (103) to which a cooling pipe is provided. The cooling pipe is provided so as to cool in a prioritized manner the area near a uniform region in which the uniformity of the static magnetic field is maintained.

Description

technical field [0001] Embodiments of the present invention relate to a magnetic resonance imaging apparatus and a gradient magnetic field coil. Background technique [0002] Magnetic resonance imaging is to magnetically excite the nuclear spins of the subject placed in a static magnetic field with an RF (Radio Frequency) pulse at its Larmor frequency, and the data of the magnetic resonance signal generated with the excitation A camera method to generate an image. [0003] In this magnetic resonance imaging, during high-resolution imaging or high-speed imaging, the temperature of a metal shim (for example, an iron shim) arranged in a gradient magnetic field coil tends to rise. The iron spacer is originally arranged to correct the unevenness of the static magnetic field, but when the temperature of the iron spacer rises, the magnetic susceptibility changes, and as a result, the center frequency of the static magnetic field may be affected. Specifically, if the temperature o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055
CPCG01R33/3856G01R33/3815G01R33/3873A61B5/055
Inventor 坂仓良知山下正干小林哲也
Owner TOSHIBA MEDICAL SYST CORP
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