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Static magnetic correction method and MRI system

A static magnetic field and magnetic field technology, applied in the field of static magnetic field correction methods and MRI systems, can solve problems such as difficult, fast and precise correction, and achieve fast and uniform effects of static magnetic field strength and static magnetic field uniformity

Inactive Publication Date: 2007-12-05
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

[0007] On the other hand, the static magnetic field correction method of the related art using a shim material or a magnetic tab has a problem that it is difficult to perform quick and fine correction

Method used

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  • Static magnetic correction method and MRI system
  • Static magnetic correction method and MRI system
  • Static magnetic correction method and MRI system

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Experimental program
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no. 2 example

[0108] The second embodiment corrects for static magnetic field strength and uniformity.

[0109] FIG. 10 is an explanatory diagram of correction currents Ia and Ib.

[0110] B0 correction coil driving power supply 19a and 19b respectively provide correction current Ia and Ib to two correction coils 20, these two correction coils 20 are added on a pair of columnar yokes Py, and its position is that the imaging area is inserted between them somewhere in between. The pair of B0 correction coils 20 generate correction magnetic fields B0a and B0b in which at least one of direction and strength are different, and these fields are then added to the static magnetic field B0m generated by the permanent magnet M.

[0111]The correction currents Ia and Ib include a 0-dimensional component Io for compensating for excess or deficiency of the static magnetic field strength in the middle of the imaging area, and a 1-dimensional component i for compensating for the uniformity of the one-dim...

no. 3 example

[0131] The third embodiment has four columnar yokes Py.

[0132] As shown in FIG. 13, each of the four cylindrical yokes has a B0 correction coil 20, and the B0 correction coils 20 provided in the opposing cylindrical yokes Py are paired to control the correction current.

[0133] According to the MRI system of the third embodiment, the strength of the static magnetic field and the uniformity of the static magnetic field in the X-Y direction can be quickly and finely corrected.

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Abstract

To correct static magnetic field intensity and homogeneity of an MRI system, B0 correction coil driving power sources respectively supply correction electric currents to B0 correction coils added to a pair of pillar yokes at the position where an imaging region is interposed therebetween, and the pair of B0 correction coils produce correction magnetic fields in which at least one of the direction and intensity is different, which are then applied to static magnetic fields produced by permanent magnets.

Description

Background of the invention [0001] The present invention relates to a static magnetic field correction method and an MRI (Magnetic Resonance Imaging) system. More particularly, the present invention relates to a static magnetic field correction method for correcting an MRI system and a static magnetic field strength, a static magnetic field correction method for correcting the static magnetic field uniformity of an MRI system, and an MRI system capable of properly implementing the static magnetic field correction method . [0002] In a permanent magnet type MRI system, the magnetic properties of the permanent magnets vary greatly. Small magnets are added to correct for these variations to obtain a target static magnetic field strength. [0003] On the other hand, the static magnetic field homogeneity of the MRI system is extremely important to ensure adequate image quality. In particular, the EPI (Echo Plane Imaging) method developed in recent years is very sensitive to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/389G01R33/387A61B5/055G01R33/38G01R33/3875
CPCG01R33/3875G01R33/3806
Inventor T·戈托S·米亚莫托
Owner GE MEDICAL SYST GLOBAL TECH CO LLC