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Magnet device and magnetic resonance imaging device

A technology of a magnet device and a camera area, which is used in measurement devices, measurement of magnetic variables, medical science, etc., can solve the problems of inability to correct the magnetic field, inability to achieve target uniformity, and reduction in the accuracy of magnetic field adjustment.

Active Publication Date: 2019-02-26
HITACHI HEALTHCARE MFG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the degree of freedom related to the quantity and arrangement of the shimming parts is small, the adjustment accuracy of the magnetic field will be reduced, and there is a possibility that the magnetic field cannot be corrected, that is, the target uniformity cannot be achieved
On the other hand, when the freedom related to the quantity and configuration of the shimming components is too high, the resolution is too high for the ideal configuration, and the efficiency of passive shimming operation will be reduced. Possibility of increased time required

Method used

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  • Magnet device and magnetic resonance imaging device
  • Magnet device and magnetic resonance imaging device
  • Magnet device and magnetic resonance imaging device

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0037] figure 1 It is a perspective view of the magnetic resonance imaging apparatus 1 of the first embodiment.

[0038] Such as figure 1 As shown, the magnetic resonance imaging apparatus 1 has: a magnet device 2 that generates a uniform magnetic field in an imaging region 9; The control part 7 which controls the whole magnetic resonance imaging apparatus 1, such as the magnet device 2 and the bed 8, is controlled. The magnetic resonance imaging apparatus 1 utilizes the nuclear magnetic resonance phenomenon that occurs when a subject is irradiated with a high-frequency pulse in an imaging region 9 formed with a uniform magnetic field to capture an MRI image expressing physical or chemical properties of the subject.

[0039] The control unit 7 is connected to the magnet device 2 and the bed 8 . The control unit 7 has an operation unit 72 capable of adjusting control contents in accordance with an operator's operation, and a display unit 71 that displays captured MRI images....

no. 2 approach

[0108] Figure 9 It is a perspective view showing the shim member fixing plate 19A and the shim member 20A constituting the magnetic field adjustment mechanism 11L in the second embodiment. for and image 3 The same elements of the magnetic field adjustment mechanism 11L of the first embodiment shown are assigned the same reference numerals.

[0109] Such as Figure 9 As shown, the magnetic field adjustment mechanism 11L of the second embodiment is configured to include a shim member fixing plate 19A and a shim member 20A that are different from those of the first embodiment.

[0110] The shim member fixing plate 19A of the second embodiment does not form the shim member fixing holes 12 of the first embodiment, but the circumferential frame lines 17 and the radial frame lines 18 are drawn on the surface to form the grids 14 . The shim member 20A of the second embodiment is disc-shaped, and unlike the shim member 20 of the first embodiment, does not include a threaded portio...

no. 3 approach

[0113] Figure 10 It is a perspective view showing the shim fixing plate 19B and the shim fixing plate cover 191 constituting the magnetic field adjustment mechanism 11L in the third embodiment. for and image 3 The same elements in the magnetic field adjustment mechanism 11L of the first embodiment shown are assigned the same reference numerals.

[0114] Such as Figure 10 As shown, the magnetic field adjustment mechanism 11L of the third embodiment is configured to include: a shim member fixing plate 19B, a shim member fixing plate cover 191 and a shim member 20 .

[0115]In the third embodiment, on the shim member fixing plate cover 191 made of non-magnetic material such as fiber-reinforced plastics, for example, the circumferential frame line 17B and the radial frame line 18B are drawn to form the grid 14B. A plurality of holes 12B through which the shim member 20 passes. Shim member fixing holes 12 are formed on the shim member fixing plate 19B, but unlike the first e...

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PUM

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Abstract

The purpose of the present invention is to quantitatively ensure the positional accuracy of the arrangement of shim members in passive shimming work on a magnet device of a magnetic resonance imaging device. This magnet device is provided with: one set of magnetic-field generation sources which are disposed facing each other in a vertical direction, and which generate a magnetic field in an imaging area; and magnetic-field adjustment mechanisms (11L) or the like which are disposed facing each other in the vertical direction with the imaging area therebetween, and which adjust the uniformity of the magnetic field. The magnetic-field adjustment mechanisms (11L) or the like are each provided with: shim members (20) comprising magnetic bodies or permanent magnets; and a shim-member fixation plate (19) which has a substantially circular or substantially polygonal outer peripheral shape, which has the surface thereof divided into a plurality of boxes (14), and in which the shim members (20) are fixed. Each of the boxes (14) quantitatively indicates the adjustment accuracy of each of the positions of the shim members (20) placed therein.

Description

technical field [0001] The present invention relates to a magnet device and a magnetic resonance imaging device including the magnet device. Background technique [0002] A magnetic resonance imaging device (hereinafter sometimes referred to as "MRI (Magnetic Resonance Imaging: Magnetic Resonance Imaging) device") utilizes the nuclear magnetic resonance phenomenon to capture images representing the physical or chemical properties of the subject (hereinafter sometimes referred to as "MRI images") ). This MRI image is mainly used for medical diagnosis. In this magnetic resonance imaging apparatus, a uniform magnetic field is formed in an imaging region by its own magnet device, a subject is arranged, and a high-frequency pulse is irradiated to the subject to generate a nuclear magnetic resonance phenomenon. [0003] In order to improve the image quality of the magnetic resonance imaging device, it is necessary to improve the uniformity of the static magnetic field formed by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055G01R33/3873
CPCG01R33/3873G01R33/3806
Inventor 堀知新
Owner HITACHI HEALTHCARE MFG LTD