Magnetic resonance imaging apparatus and method
First Claim
Patent Images
1. A magnetic resonance imaging apparatus comprising:
- static magnetic field generating means for generating a static magnetic field in an imaging space;
measuring means for generating a high-frequency magnetic field and a gradient magnetic field in the imaging space and measuring a nuclear magnetic resonance signal generated from an object to be examined placed in the imaging space;
signal processing means for reconstructing a magnetic resonance image based on the nuclear magnetic resonance signal;
control means for controlling the measuring means and the signal processing means; and
display means for displaying the magnetic resonance image obtained by the signal processing means,characterized in further comprising;
storing means for storing a first set of information representing inhomogeneous distribution of the static magnetic field generated depending on the characteristic of the static magnetic field generating means and a second set of information representing inhomogeneous distribution of the static magnetic field generated depending on a tissue of the object;
setting means for setting an imaging FOV in a desired region of the object;
selecting means, from among the second set of information, for selecting the information corresponding to the set imaging FOV as a third set of information; and
correcting magnetic field generating means for generating a correcting magnetic field for correcting the static magnetic field based on the third set of information and the first set of information.
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Abstract
A magnetic resonance imaging apparatus is configured to generate a correcting magnetic field for correcting a static magnetic field, based on a first set of information representing an inhomogeneous distribution of the static magnetic field generated depending on the characteristic of the static magnetic field generating means, a second set of information representing an inhomogeneous distribution of the static magnetic field generated depending on the tissue of the object, a third set of information corresponding to a set field of view for imaging in a desired region of the object.
7 Citations
20 Claims
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1. A magnetic resonance imaging apparatus comprising:
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static magnetic field generating means for generating a static magnetic field in an imaging space; measuring means for generating a high-frequency magnetic field and a gradient magnetic field in the imaging space and measuring a nuclear magnetic resonance signal generated from an object to be examined placed in the imaging space; signal processing means for reconstructing a magnetic resonance image based on the nuclear magnetic resonance signal; control means for controlling the measuring means and the signal processing means; and display means for displaying the magnetic resonance image obtained by the signal processing means, characterized in further comprising; storing means for storing a first set of information representing inhomogeneous distribution of the static magnetic field generated depending on the characteristic of the static magnetic field generating means and a second set of information representing inhomogeneous distribution of the static magnetic field generated depending on a tissue of the object; setting means for setting an imaging FOV in a desired region of the object; selecting means, from among the second set of information, for selecting the information corresponding to the set imaging FOV as a third set of information; and correcting magnetic field generating means for generating a correcting magnetic field for correcting the static magnetic field based on the third set of information and the first set of information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A magnetic resonance imaging method for obtaining a nuclear magnetic resonance image of an object to be examined placed in a static magnetic field, said method comprising:
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(1) storing a first set of information representing inhomogeneous distribution of the static magnetic field and a second set of information representing inhomogeneous distribution of the static magnetic field generated depending on a tissue of the object; (2) a step for setting an imaging FOV for representing a desired region of the object; (3) a step, from among the second set of information, for selecting the information corresponding to the set imaging FOV as a third set of information; (4) a step for obtaining a fourth set of information by adding the third set of information and the first set of information; and (5) a step for generating a correcting magnetic field based on the fourth set of information, and measuring a nuclear magnetic field generated thereby. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification