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System and method for magnetizing blocks on a magnet assembly of an MRI device

A magnetic component, non-magnetized technology, applied in the direction of magnetic objects, measuring devices, electrical components, etc., can solve the problems of expensive, expensive current drive, high cost, etc.

Inactive Publication Date: 2006-01-04
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to cool the individual blocks, an additional cooling system must be provided in the vicinity of the magnetic coils, which is quite expensive
Second, large magnetic coils require high currents to generate large magnetic fields, which requires fairly expensive current drivers
To hold the pieces and coils in the desired position, the yokes are secured with rather large clamps, which are also quite expensive

Method used

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  • System and method for magnetizing blocks on a magnet assembly of an MRI device
  • System and method for magnetizing blocks on a magnet assembly of an MRI device
  • System and method for magnetizing blocks on a magnet assembly of an MRI device

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Embodiment Construction

[0018] see figure 1 and FIG. 2 , which illustrates an MRI imaging system 10 for generating digital images of a patient, according to an exemplary embodiment. MRI imaging system 10 includes housing 11, permanent magnet assembly 12, gradient coil assembly 13, RF coil assembly 14, computer 15, pulse generator 16, gradient amplifier 17, RF generator 18, RF amplifier 19, data acquisition board 20 and RF Receiver 21.

[0019] The RF generator 18 generates a signal amplified by the RF amplifier 19 and sends it to the RF coil assembly 14 in response to a received control signal from the computer 15 . In response, RF coil assembly 14 generates RF signals that are transmitted to the patient in the scanning region and induce nuclei in the patient to emit RF signals that are received by RF receiver 21 . The received RF signal is digitized in the data acquisition board 20 and then transmitted to the computer 15 .

[0020] The pulse generator 16 responds to the control signal received fr...

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Abstract

A system and method are provided for magnetizing one of a plurality of substantially non-magnetized blocks (38) disposed on a pole plate of a magnet assembly (12) of an MRI apparatus (10) . The system includes first and second cantilever sections (62, 162) connectable together. The system also includes a first electromagnetic coil (70) disposed on a first end of the first cantilever portion (62), wherein the first electromagnetic coil (70) is configured to generate a magnetic field from which the first electromagnetic coil (70) propagating through at least one non-magnetized mass and pole plate, and also through the first and second cantilever portions (62, 162) to magnetize said fast.

Description

technical field [0001] The present invention relates to Magnetic Resonance Imaging (MRI) systems, and more particularly to systems and methods for magnetizing a block on a magnet assembly of an MRI apparatus. Background technique [0002] Magnet assemblies have been used in magnetic resonance imaging (MRI) systems to generate uniform magnetic fields. During magnet assembly manufacture, a non-magnetized pole plate comprising a plurality of rare earth blocks is mounted on the yoke, wherein the non-magnetized pole plate is subsequently magnetized. In order to magnetize multiple blocks at the same time, a rather large magnetic coil is placed on the non-magnetized block in order to allow a strong magnetic field to propagate through the block. [0003] However, magnetizing a non-magnetized block with relatively large magnetic coils has some drawbacks. First, large magnetic coils generate considerable heat on the individual pieces of the magnet assembly and on the coil itself, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F13/00G01R33/383
CPCG01R33/383H01F13/003
Inventor W·沈B·-X·徐
Owner GENERAL ELECTRIC CO
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