Ferromagnetic augmentation for magnetic resonance imaging
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01V-003/00
G01R-033/38
G01R-033/36
G01R-033/385
G01R-033/44
G01R-033/58
G01R-033/48
H01F-007/02
H01F-007/06
G01R-033/381
G01R-033/383
G01R-033/3875
G01R-033/54
G01R-033/56
G01R-033/34
G01R-033/422
출원번호
US-0846255
(2015-09-04)
등록번호
US-9638773
(2017-05-02)
발명자
/ 주소
Poole, Michael Stephen
Rearick, Todd
Rothberg, Jonathan M.
출원인 / 주소
Hyperfine Research, Inc.
대리인 / 주소
Wolf, Greenfield & Sacks, P.C.
인용정보
피인용 횟수 :
2인용 특허 :
12
초록▼
In some aspects, a magnetic system for use in a low-field MRI system. The magnetic system comprises at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the low-field MRI system, and at least one permanent magnet to produce a magnetic fie
In some aspects, a magnetic system for use in a low-field MRI system. The magnetic system comprises at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the low-field MRI system, and at least one permanent magnet to produce a magnetic field to contribute to the B0 field.
대표청구항▼
1. A magnetic system for use in a magnetic resonance imaging system, the magnetic system comprising: at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the magnetic resonance imaging system, the electromagnet comprising at least one ele
1. A magnetic system for use in a magnetic resonance imaging system, the magnetic system comprising: at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the magnetic resonance imaging system, the electromagnet comprising at least one electromagnetic coil wound using a copper or aluminum conductor to generate a magnetic field; andat least one ferromagnetic component configured to capture and direct at least some of the magnetic field generated by the electromagnet to increase the magnetic flux density within an imaging region of the magnetic resonance imaging system,wherein the B0 field generated is less than or equal to approximately 0.2T and greater than or equal to approximately 0.1T. 2. A magnetic system for use in a magnetic resonance imaging system, the magnetic system comprising: at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the magnetic resonance imaging system, the electromagnet comprising at least one electromagnetic coil wound using a copper or aluminum conductor to generate a magnetic field; andat least one ferromagnetic component configured to capture and direct at least some of the magnetic field generated by the electromagnet to increase the magnetic flux density within an imaging region of the magnetic resonance imaging system,wherein the B0 field generated is less than or equal to approximately 0.1T and greater than or equal to approximately 50 mT. 3. A The magnetic system of claim 2 for use in a magnetic resonance imaging system, the magnetic system comprising: at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the magnetic resonance imaging system, the electromagnet comprising at least one electromagnetic coil wound using a copper or aluminum conductor to generate a magnetic field; andat least one ferromagnetic component configured to capture and direct at least some of the magnetic field generated by the electromagnet to increase the magnetic flux density within an imaging region of the magnetic resonance imaging system,wherein the B0 field generated is less than or equal to approximately 50 mT and greater than or equal to approximately 20 mT. 4. A magnetic system for use in a magnetic resonance imaging system, the magnetic system comprising: at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the magnetic resonance imaging system, the electromagnet comprising at least one electromagnetic coil wound using a copper or aluminum conductor to generate a magnetic field; andat least one ferromagnetic component configured to capture and direct at least some of the magnetic field generated by the electromagnet to increase the magnetic flux density within an imaging region of the magnetic resonance imaging system,wherein the B0 field generated is less than or equal to approximately 20 mT and greater than or equal to approximately 10 mT. 5. A magnetic system for use in a magnetic resonance imaging system, the magnetic system comprising: at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B0 field for the magnetic resonance imaging system, the electromagnet comprising at least one electromagnetic coil wound using a copper or aluminum conductor to generate a magnetic field, wherein the at least one electromagnet comprises a pair of B0 coils including a first B0 coil and a second B0 coil arranged in a bi-planar configuration;at least one ferromagnetic component configured to capture and direct at least some of the magnetic field generated by the electromagnet to increase the magnetic flux density within an imaging region of the magnetic resonance imaging system, wherein the at least one ferromagnetic component is configured to increase the field strength and/or alter the homogeneity of the B0 field in the imaging region between the first B0 coil and the second B0 coil; andat least one laminate panel having at least one electromagnetic component fabricated thereon, wherein the at least one laminate panel comprises at least one x-gradient coil, at least one y-gradient coil, and at least one z-gradient coil to provide spatial encoding in x, y, and z directions, respectively. 6. The magnetic system of claim 5, wherein the at least one ferromagnetic component comprises a ferromagnetic structure connected to the first B0 coil and the second B0 coil to form a magnetic circuit that provides at least one return path for magnetic flux generated by the first B0 coil and the second B0 coil through the ferromagnetic structure. 7. The magnetic system of claim 6, wherein the ferromagnetic structure provides the at least one return path for magnetic flux along at least one side of the ferromagnetic structure. 8. The magnetic system of claim 7, wherein the ferromagnetic structure provides a plurality of return paths for magnetic flux along sides of the ferromagnetic structure. 9. The magnetic system of claim 7, wherein the ferromagnetic structure comprises a C-shaped ferromagnetic structure that provides a return path for magnetic flux along only one side of the ferromagnetic structure. 10. The magnetic system of claim 6, wherein the ferromagnetic structure comprises at least one beveled corner to reduce a magnetic reluctance around the at least one beveled corner. 11. The magnetic system of claim 6, wherein the ferromagnetic structure comprises a plurality of ferromagnetic posts configured to provide the at least one return path for magnetic flux. 12. The magnetic system of claim 11, wherein at least one of the plurality of ferromagnetic posts is removable from the low-field MRI system. 13. The magnetic system of claim 6, wherein the at least one ferromagnetic component further comprises at least one first ferromagnetic component located adjacent to the first B0 coil and/or the second B0 coil to alter where the magnetic flux exits the ferromagnetic structure. 14. The magnetic system of claim 13, wherein the ferromagnetic structure comprises a first ferromagnetic material and wherein the at least one first ferromagnetic component located adjacent to the first B0 coil and/or the second B0 coil comprises a second ferromagnetic material different than the first ferromagnetic material. 15. The magnetic system of claim 5, wherein the at least one ferromagnetic component comprises one or more solid ferromagnetic components. 16. The magnetic system of claim 5, wherein the at least one laminate panel comprises at least one B0 coil and/or at least one shim coil. 17. The magnetic system of claim 5, wherein the at least one ferromagnetic component comprises at least one shim ring located adjacent to the first B0 coil and/or the second B0 coil. 18. The magnetic system of claim 5, wherein the at least one ferromagnetic component comprises a plurality of ferromagnetic shim pieces located adjacent to the first B0 coil and/or the second B0 coil. 19. The magnetic system of claim 5, wherein the at least one ferromagnetic component comprises at least one ferromagnetic pole piece located adjacent to the first B0 coil and/or the second B0 coil. 20. The magnetic system of claim 19, wherein the at least one ferromagnetic pole piece comprises a pole piece having a non-rectangular shape. 21. The magnetic system of claim 5, wherein the at least one ferromagnetic component is configured to provide a support structure that provides support for the first B0 coil and/or the second B0 coil. 22. The magnetic system of claim 5, wherein the at least one ferromagnetic component comprises a plurality of electrically isolated segments to reduce eddy currents generated in the at least one ferromagnetic component. 23. The magnetic system of claim 5, wherein the at least one ferromagnetic component has a non-uniform thickness to reduce a weight of the at least one ferromagnetic component. 24. The magnetic system of claim 5, further comprising at least one support structure formed on a surface of the at least one ferromagnetic component. 25. The magnetic system of claim 5, wherein the at least one laminate panel comprises at least one B0 coil configured to contribute to the B0 magnetic field. 26. The magnetic system of claim 5, wherein the at least one laminate panel comprises a first laminate panel and a second laminate panel arranged in a bi-planar configuration.
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이 특허에 인용된 특허 (12)
Serafin Daniel L. ; Schultz Paul B. ; Askin Albert L. ; Stanko Donald J., Aluminum laminate.
Carlson Joseph W. (Kensington CA) Kaufman Leon (San Francisco CA), Method and apparatus for MRI using selectively shaped image volume of homogeneous NMR polarizing field.
Damadian Raymond V. (Woodbury NY) Giambalvo Anthony J. (Kings Park NY) Shenoy Rajendra K. (Commack NY) Votruba Jan V. (Port Jefferson Station NY), NMR screening method.
Danby Gordon T. (Melville NY) Damadian Raymond V. (Melville NY) Minkoff Lawrence A. (Melville NY), Nuclear magnetic resonance apparatus including permanent magnet configuration.
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