Method of magnetic field contarolled gap filling

A technology of field strength and magnets, applied in the field of gap filling controlled by magnetic field

Inactive Publication Date: 2004-10-06
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This device is commonly referred to as the "B0 plug" and it...

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  • Method of magnetic field contarolled gap filling
  • Method of magnetic field contarolled gap filling
  • Method of magnetic field contarolled gap filling

Examples

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Embodiment Construction

[0021] see figure 2 , where the major components of a preferred magnetic resonance imaging (MRI) system 10 incorporating the present invention are shown. Operation of the system is controlled by an operator console 12 which includes a keyboard or other input device 13 , a control panel 14 and a display screen 16 . Console 12 communicates via link 18 with a separate computer system 20 that enables an operator to control the generation and display of images on display screen 16 . Computer system 20 includes a number of modules. They communicate with each other through the backplane 20a. These include an image processor module 22, a CPU module 24 and a memory module 26, known in the art as a frame buffer, for storing an array of image data. Computer system 20 is linked to disk storage 28 and tape drive 30 for storing image data and programs, and communicates with an independent system control 32 via high speed serial link 34 . The input device 13 may include a mouse, joystic...

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Abstract

The present invention is directed to a method of shimming a magnet assembly of an MR imaging system such that a desired B0 field strength may be created with minimal inhomogeneities therethrough. With this method, sufficient shimming of the magnet assembly may be achieved without requiring mechanical variations to the magnet assembly after the magnet assembly has been assembled. The invention analyzes variations from the desired B0 field and inhomogeneities at a number of target points along the magnet assembly or B0 field. A comparison is then made at each point to determine a shimming or weighting factor such that the desired overall B0 field strength and targeted field homogeneity is achieved. Active and/or passive shim elements may then be incorporated into the magnet assembly at each target point to achieve the desired overall field strength and minimum overall field homogeneity.

Description

[0001] This application claims priority to US Patent No. 60 / 320,037, filed March 21,2003. technical field [0002] The present invention relates generally to a method of B0 controlled gap filling of a magnet assembly of an MR system, and in particular to such a method of gap filling of a magnet assembly of an MR system, which is used once the magnet assembly is assembled and does not require Mechanically tuned to achieve a near-uniform magnetic field with the necessary signal strength. Background technique [0003] It is generally known that when a substance such as human tissue is in a uniform magnetic field (polarization field B0), the individual magnetic moments of the spins in said tissue try to align along this polarization domain, and at their characteristic Larmor frequency Precess around them in random order. If the substance or tissue enters a magnetic field in the x-y plane and close to the Larmor frequency (exciting magnetic field B1), the net alignment moment or...

Claims

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Application Information

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IPC IPC(8): G01R33/3873G01R33/3875
CPCG01R33/3873G01R33/3875
Inventor 黄金华徐步新比詹·多里布鲁斯·安
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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