System for reduction of a magnetic fringe field of a magnetic resonance imaging device
First Claim
1. A magnetic resonance imaging (MRI) system, the system comprising:
- a magnetic field device to generate a magnetic field within a measurement volume and to generate a magnetic fringe field external to the measurement volume, wherein the measurement volume is to accommodate at least a portion of a patient;
a ferromagnetic housing to envelop the magnetic field device, the housing having a first portion and a second portion, wherein thickness of the first portion is different from thickness of the second portion; and
a plate, having a plate opening, positioned external to the housing at a predetermined distance from the housing, wherein the plate opening is aligned with a corresponding housing opening in the housing to allow insertion of at least a portion of the patient therethrough;
wherein the generated magnetic fringe field is asymmetric, and wherein a shape of the plate is selected from the group consisting of;
a square, a rectangular, and an oval.
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Accused Products
Abstract
A magnetic resonance imaging (MRI) system is provided. The MRI system can include a magnetic field device to generate a magnetic field within a measurement volume and to generate a magnetic fringe field external to the measurement volume. The MRI system can include a ferromagnetic housing to envelop the magnetic field device. The housing can have a first portion and a second portion, where thickness of the first portion is different from thickness of the second portion. The MRI system can include a plate having a plate opening and positioned external to the housing at a predetermined distance from the housing. In some embodiments, the magnetic fringe field generated by the MRI system can be asymmetric with respect to a center of the measurement volume.
103 Citations
18 Claims
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1. A magnetic resonance imaging (MRI) system, the system comprising:
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a magnetic field device to generate a magnetic field within a measurement volume and to generate a magnetic fringe field external to the measurement volume, wherein the measurement volume is to accommodate at least a portion of a patient; a ferromagnetic housing to envelop the magnetic field device, the housing having a first portion and a second portion, wherein thickness of the first portion is different from thickness of the second portion; and a plate, having a plate opening, positioned external to the housing at a predetermined distance from the housing, wherein the plate opening is aligned with a corresponding housing opening in the housing to allow insertion of at least a portion of the patient therethrough; wherein the generated magnetic fringe field is asymmetric, and wherein a shape of the plate is selected from the group consisting of;
a square, a rectangular, and an oval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A magnetic resonance imaging (MRI) system, the system comprising:
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a magnetic field device to generate a magnetic field within a measurement volume and to generate a magnetic fringe field external to the measurement volume, wherein the measurement volume is to accommodate at least a portion of a patient; a ferromagnetic housing to envelop the magnetic field device, the housing having a first portion and a second portion, wherein thickness of the first portion is different from thickness of the second portion; and a plate, having a plate opening, positioned external to the housing at a predetermined distance from the housing, wherein the plate opening is aligned with a corresponding housing opening in the housing to allow insertion of at least a portion of the patient therethrough;
wherein the generated magnetic fringe field is asymmetric and wherein the system is positioned within a desired room and wherein the plate is coupled to at least one of;
a floor of the room, a ceiling of the room or any combination thereof. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification