Spatiotemporal magnetic field monitoring with hall effect sensors during the MRI scan
First Claim
1. A magnetic resonance imaging (MRI) system, comprising:
- a gantry for receiving a subject, said gantry having a longitudinal axis (herein “
z-axis”
);
a magnet disposed about said gantry for generating a static magnetic field along said longitudinal axis of the gantry;
a first gradient magnet for generating a gradient magnetic field along said longitudinal axis;
a second gradient magnet for generating a gradient magnetic field along a first transverse direction (herein “
x-axis”
) orthogonal said longitudinal axis;
a third gradient magnet for generating a gradient magnetic field along a second transverse direction (herein “
y-axis”
) orthogonal to said longitudinal axis and said first transverse direction;
a plurality of magnetic sensors positioned relative to the gantry for measuring gradients of transverse components of magnetic field along one or more of the x, y and z axes, said magnetic sensors generating signals indicative of said measured transverse magnetic field gradients; and
a controller for receiving said signals and operating on said signals to determine gradients of the gradient magnetic field along said longitudinal axis.
1 Assignment
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Accused Products
Abstract
An MRI system includes a gantry having a longitudinal axis (herein “z-axis”) and a magnet disposed about the gantry for generating a static magnetic field along the longitudinal axis. Additionally, the system comprises a first gradient magnet for generating a gradient magnetic field along the longitudinal axis; a second gradient magnet for generating a gradient magnetic field along a first transverse direction (herein “x-axis”) orthogonal the longitudinal axis; and a third gradient magnet for generating a gradient magnetic field along a second transverse direction (herein “y-axis”) orthogonal to the longitudinal axis and the first transverse direction. Magnetic sensors are positioned relative to the gantry to measure gradients of transverse components of magnetic field along one or more of the x, y and z axes. A controller receives measurement signals from the sensors and operates on those signals to determine gradients of the gradient magnetic field along the longitudinal axis.
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Citations
20 Claims
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1. A magnetic resonance imaging (MRI) system, comprising:
-
a gantry for receiving a subject, said gantry having a longitudinal axis (herein “
z-axis”
);a magnet disposed about said gantry for generating a static magnetic field along said longitudinal axis of the gantry; a first gradient magnet for generating a gradient magnetic field along said longitudinal axis; a second gradient magnet for generating a gradient magnetic field along a first transverse direction (herein “
x-axis”
) orthogonal said longitudinal axis;a third gradient magnet for generating a gradient magnetic field along a second transverse direction (herein “
y-axis”
) orthogonal to said longitudinal axis and said first transverse direction;a plurality of magnetic sensors positioned relative to the gantry for measuring gradients of transverse components of magnetic field along one or more of the x, y and z axes, said magnetic sensors generating signals indicative of said measured transverse magnetic field gradients; and a controller for receiving said signals and operating on said signals to determine gradients of the gradient magnetic field along said longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measuring a gradient magnetic field in a magnetic resonance system, comprising:
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positioning a plurality of magnetic sensors relative to a longitudinal axis (herein “
z-axis”
) of a gantry;using the plurality of magnetic sensors to collect measurements indicative of; a measurement of a gradient magnetic field along a first transverse direction (herein “
x-axis”
) orthogonal to the longitudinal axis, anda measurement of a gradient magnetic field along a second transverse direction (herein “
y-axis”
) orthogonal to the longitudinal axis and the first transverse direction;determining a measurement of a gradient magnetic field along the z-axis based on the measurement of the gradient magnetic field along the x-axis and the measurement of a gradient magnetic field along the y-axis. - View Dependent Claims (12, 13, 14, 15)
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16. A magnetic resonance imaging (MRI) system, comprising:
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a plurality of magnetic sensors positioned relative to a longitudinal axis (herein “
z-axis”
) of a gantry, wherein the plurality of magnetic sensors are configured to collect measurements during an MRI scan comprising;a measurement of a gradient magnetic field along a first transverse direction (herein “
x-axis”
) orthogonal to the longitudinal axis, anda measurement of a gradient magnetic field along a second transverse direction (herein “
y-axis”
) orthogonal to the longitudinal axis and the first transverse direction; andone or more computers configured to determine a measurement of a gradient magnetic field along the z-axis based on the measurement of the gradient magnetic field along the x-axis and the measurement of the gradient magnetic field along the y-axis. - View Dependent Claims (17, 18, 19, 20)
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Specification