ACTIVE COMPENSATION FOR FIELD DISTORTING COMPONENTS IN A MAGNETIC RESONANCE IMAGING SYSTEM WITH A GANTRY
First Claim
1. A medical apparatus comprising:
- a magnetic resonance imaging system for acquiring magnetic resonance data from an imaging zone, wherein the magnetic resonance imaging system comprises a magnet for generating a magnetic field within the imaging zone;
magnetic compensation coils for compensating for magnetic inhomogeneities in the magnetic field within the imaging zone;
a gantry operable for rotating about the imaging zone, wherein the gantry is configured to rotate about a rotational axis;
a position sensor for measuring position data, the position data comprising an angular position of the gantry and an angular velocity of the gantry;
at least one magnetic field distorting component, wherein the gantry is further operable to rotate the at least one magnetic field distorting component about the rotational axis;
a memory for storing machine executable instructions and field correction data, wherein the field correction data is descriptive of the magnetic field within the imaging zone as a function of the angular position and the angular velocity;
a processor for controlling the medical apparatus, wherein execution of the instructions cause the processor to;
receive the position data from the position sensor;
determine coil control commands for controlling the magnetic compensation coils using the field correction data and the position data;
control the magnetic compensation coils to compensate for magnetic inhomogeneities within the imaging zone caused by the at least one magnetic field distorting component using the coil control commands; and
acquire the magnetic resonance data using the magnetic resonance imaging system.
1 Assignment
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Accused Products
Abstract
The invention provides for a medical apparatus (300, 400, 500) comprising: a magnetic resonance imaging system (306); magnetic compensation coils (334, 335) for compensating for magnetic inhomogeneities within the imaging zone; a gantry (308) operable for rotating about the imaging zone; a position sensor (312) for measuring the angular position and the angular velocity of the gantry; at least one magnetic field distorting component (310, 510, 512) in the gantry, a memory (362) storing machine executable instructions (380, 382, 410, 530, 532) and field correction data (372). The instructions cause a processor to: receive (100, 200) the position and angular velocity data from the position sensor; determine (102, 202) coil control commands (374) for controlling the magnetic compensation coils using the field correction data, the position data and the angular velocity data; control (104, 204) the magnetic compensation coils to compensate for magnetic inhomogeneities within the imaging zone using the coil control commands; and acquire (106, 212) the magnetic resonance data.
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Citations
13 Claims
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1. A medical apparatus comprising:
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a magnetic resonance imaging system for acquiring magnetic resonance data from an imaging zone, wherein the magnetic resonance imaging system comprises a magnet for generating a magnetic field within the imaging zone; magnetic compensation coils for compensating for magnetic inhomogeneities in the magnetic field within the imaging zone; a gantry operable for rotating about the imaging zone, wherein the gantry is configured to rotate about a rotational axis; a position sensor for measuring position data, the position data comprising an angular position of the gantry and an angular velocity of the gantry; at least one magnetic field distorting component, wherein the gantry is further operable to rotate the at least one magnetic field distorting component about the rotational axis; a memory for storing machine executable instructions and field correction data, wherein the field correction data is descriptive of the magnetic field within the imaging zone as a function of the angular position and the angular velocity; a processor for controlling the medical apparatus, wherein execution of the instructions cause the processor to; receive the position data from the position sensor; determine coil control commands for controlling the magnetic compensation coils using the field correction data and the position data; control the magnetic compensation coils to compensate for magnetic inhomogeneities within the imaging zone caused by the at least one magnetic field distorting component using the coil control commands; and acquire the magnetic resonance data using the magnetic resonance imaging system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling a medical apparatus,
wherein the medical apparatus comprises a magnetic resonance imaging system arranged to acquire a magnetic resonance data from an imaging zone, wherein the magnetic resonance imaging system comprises a magnet for generating a magnetic field within the imaging zone, wherein the medical apparatus comprises magnetic compensation coils for compensating for magnetic inhomogeneities in the magnetic field within the imaging zone, wherein the medical apparatus further comprises a gantry operable for rotating about the imaging zone, wherein the gantry is configured to rotate about a rotational axis, wherein the medical apparatus further comprises a position sensor for measuring position data, the position data comprising an angular position of the gantry and an angular velocity of the gantry, wherein the medical apparatus further comprises at least one magnetic field distorting component, wherein the gantry is further operable to rotate the at least one magnetic distorting component about the rotational axis, the method comprising the steps of: -
receiving the position and velocity data from the position sensor; determining coil control commands for controlling the magnetic compensation coils using the field correction data and the position and velocity data, wherein the field correction data is descriptive of the magnetic field within the imaging zone as a function of the angular position and the angular velocity; controlling the magnetic compensation coils to compensate for magnetic inhomogeneities within the imaging zone caused by the at least one magnetic field distorting component using the coil control commands; and acquiring the magnetic resonance data using the magnetic resonance imaging system. - View Dependent Claims (11, 12, 13)
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Specification