System for generating a magnetic field

Patent metadata

Field	Value
Publication number	US-10847294-B2
Application number	US-201715645568-A
Country	US
Kind code	B2
Filing date	Jul 10, 2017
Priority date	Jul 10, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

Generally, a system for generating a magnetic field having a desired magnetic field strength and/or a desired magnetic field direction is provided. The system can include a plurality of magnetic segments and/or a plurality of ferromagnetic segments. Each magnetic segment can be positioned adjacent to at least one of the plurality of magnetic segments. Each ferromagnetic segment can be positioned adjacent to at least one of the plurality of magnetic segments. In various embodiments, a size, shape, positioning and/or number of magnetic segments and/or ferromagnetic segments in the system, as well as a magnetization direction of the magnetic segments can be predetermined based on, for example, predetermined parameters of the system (e.g., a desired magnetic field strength, direction and/or uniformity of the magnetic field, a desired elimination of a magnetic fringe field and/or total weight of the system) and/or based on a desired application of the system (e.g., performing a magnetic resonance imaging of at least a portion of a patient and/or performing a magnetic resonance spectroscopy of a sample).

First claim

The invention claimed is:

1. A system for generating a magnetic field having a desired magnetic field strength and a desired magnetic field direction, the system comprising:
a plurality of magnetic segments, each magnetic segment positioned adjacent to at least one of the plurality of magnetic segments, and each magnetic segment having a magnetization direction, wherein the magnetization direction is based on the desired magnetic field strength and the desired magnetic field direction;
a plurality of ferromagnetic segments, each ferromagnetic segment positioned adjacent to at least one of the plurality of magnetic segments; and
a plurality of fluid filled segments, wherein each of the plurality of fluid filled segments is positioned adjacent to at least one of the plurality of magnetic segments, and wherein at least one of the fluid filled segments comprises air.

2. The system of claim 1 , wherein the magnetization direction of each magnetic segment is further based on the magnetization direction of respective adjacent magnetic segments.

3. The system of claim 1 , wherein the shape and size of at least one fluid filled segment corresponds to the shape and size of at least one of magnetic segments and ferromagnetic segments.

4. The system of claim 1 , wherein at least one of the magnetic segments and the ferromagnetic segments has a shape selected from a group consisting of: a cube, a hyper-rectangle, a parallelepiped, and a cylinder.

5. The system of claim 1 , wherein the magnetization direction of at least one magnetic segment is along an axis passing between two parallel faces of that magnetic segment.

6. The system of claim 1 , wherein the magnetization direction of at least one magnetic segment is along an axis passing between two opposite corners of that magnetic segment.

7. The system of claim 1 , wherein the magnetization direction of at least one magnetic segment is along an axis passing between two opposite edges of that segment.

8. The system of claim 1 , wherein the shape of at least one magnetic segment corresponds to the shape of at least one ferromagnetic segment.

9. The system of claim 1 , wherein size of at least one magnetic segment corresponds to the size of at least one ferromagnetic segment.

10. The system of claim 1 , wherein the magnetization direction of at least one magnetic segment corresponds to a positioning of that segment within the system.

11. The system of claim 1 , wherein a change in magnetization direction of at least one magnetic segment corresponds to a change in the generated magnetic field.

12. The system of claim 1 , wherein a change in magnetization direction of at least one magnetic segment corresponds to a change in the generated magnetic field.

13. The system of claim 1 , further comprising a predefined mesh configured to arrange each of the plurality of segments into a desired position.

Assignees

• Aspect Imaging Ltd

Inventors

• Rapoport Uri
• Cohen Yoram
• Goldfarb Yair

Classifications

• H01F7/0221

  Mounting means for PM, supporting, coating, encapsulating PM · CPC title

• H01F7/0215

  Flexible forms, sheets · CPC title

• H01F7/0205

  Magnetic circuits with PM in general · CPC title

• H01F7/0236

  Magnetic suspension or levitation (for vehicles B60L13/04; magnetic bearings F16C39/063) · CPC title

• H01F7/0226

  PM with variable field strength (H01F7/0284 takes precedence) · CPC title