MAGNETIC RESONANCE IMAGING APPARATUS, STATIC MAGNETIC FIELD HOMOGENEITY ADJUSTMENT METHOD, PROGRAM, AND COMPUTER
First Claim
1. A static magnetic field homogeneity adjustment method for a magnetic resonance imaging apparatus in an imaging space of computing positions of a plurality of magnetic pieces separated from the imaging space through shimming computation with respect to a static magnetic field in the imaging space generated by a magnetic field generation device, and disposing the plurality of magnetic pieces at the positions obtained through the shimming computation, the method comprising:
- an adjustment step of imposing restriction that a polarity of a magnetic field distribution generated in the imaging space by the magnetic pieces disposed at the positions is either positive or negative during the shimming computation, and adjusting the static magnetic field homogeneity.
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Accused Products
Abstract
In order to provide a static magnetic field homogeneity adjustment method capable of reducing an arrangement amount of magnetic pieces and achieving desired magnetic field homogeneity with high accuracy in magnetic field homogeneity adjustment, there is provided a static magnetic field homogeneity adjustment method in an imaging space of computing positions of a plurality of magnetic pieces separated from the imaging space through shimming computation with respect to a static magnetic field in the imaging space generated by a magnetic field generation device, and disposing the plurality of magnetic pieces at the positions obtained through the shimming computation, the method including an adjustment step of imposing restriction that a polarity of a magnetic field distribution generated in the imaging space by the magnetic pieces disposed at the positions is either positive or negative during the shimming computation, and adjusting the static magnetic field homogeneity.
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9 Claims
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1. A static magnetic field homogeneity adjustment method for a magnetic resonance imaging apparatus in an imaging space of computing positions of a plurality of magnetic pieces separated from the imaging space through shimming computation with respect to a static magnetic field in the imaging space generated by a magnetic field generation device, and disposing the plurality of magnetic pieces at the positions obtained through the shimming computation, the method comprising:
an adjustment step of imposing restriction that a polarity of a magnetic field distribution generated in the imaging space by the magnetic pieces disposed at the positions is either positive or negative during the shimming computation, and adjusting the static magnetic field homogeneity. - View Dependent Claims (2, 3, 4, 5)
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6. A magnetic resonance imaging apparatus comprising:
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a magnetic field generation device that is provided with an electromagnet forming a static magnetic field in an imaging space; and magnetic body holding members in which a plurality of depressions for accommodation of magnetic pieces for magnetic field adjustment are arranged on a surface portion of the electromagnet on the imaging space side, wherein the density of an amount of magnetic pieces accommodated in a portion of each of the magnetic body holding members close to the imaging space is higher than the density of an amount of magnetic pieces in a portion thereof distant from the imaging space. - View Dependent Claims (7, 8)
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9. A program for computing positions of a plurality of magnetic pieces separated from an imaging space through shimming computation with respect to a static magnetic field in the imaging space generated by a magnetic field generation device, and adjusting static magnetic field homogeneity in the imaging space, the program having:
a function of imposing restriction that a polarity of a magnetic field distribution generated in the imaging space by the magnetic pieces disposed at the positions is either positive or negative during the shimming computation.
Specification