US4590452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic device of apparatus in nuclear spin tomography with a shielding device
Assignee: Siemens AG
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Filing: 1984-08-14
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Granted: 1986-05-20
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Expires: 2004-08-14
Abstract
Abstract The magnetic device of a nuclear spin tomography system contains several magnet coils which surround an interior suitable for accommodating a body to be examined, and generate therein an at least largely homogeneous magnetic field. The device also includes an approximately cylindrical shielding device which surrounds the coils and consists of ferromagnetic material, and has at each end face thereof, a washer-shaped part with a central opening with a predetermined radius with respect to the cylindrical axis, in order to make possible good lateral access to the magnet coils and to provide sufficient space for laterally protruding parts. At least four beam-like shielding elements of identical design are used to form the approximately cylindrical part of the shielding device, the elements being uniformly distributed in the circumferential direction over the cylindrical surface. The shielding elements may have rectangular or triangular cross-sectional shapes.
Inventors
- 👤 Gunter Ries
- 👤 Horst Siebold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/42; G01R33/421; G01R33/38; G01R33/381; G01R33/3815; G01R33/387; G01R33/3873
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
118 words
In a magnetic device of a system for use in nuclear spin tomography comprising: several magnet coils which surround an interior suitable for receiving a body to be examined and generate therein an at least largely homogeneous magnetic field; and a cylindrical shielding device which consists of ferromagnetic material, surrounds the coils and includes a part with, at least largely, the shape of a cylinder, and, at its end faces, washer-like parts with central openings with a predetermined radius with respect to the cylinder axis, the improvement comprising: the approximately cylindrical part of the shielding device being made up of at least four beam-like shielding elements of at least identical design uniformly distributed over a common cylinder surface.
Claim 2
Dependent Claim
118 words
In a magnetic device of a system for use in nuclear spin tomography comprising: several magnet coils which surround an interior suitable for receiving a body to be examined and generate therein an at least largely homogeneous magnetic field; and a cylindrical shielding device which consists of ferromagnetic material, surrounds the coils and includes a part with, at least largely, the shape of a cylinder, and, at its end faces, washer-like parts with central openings with a predetermined radius with respect to the cylinder axis, the improvement comprising: the approximately cylindrical part of the shielding device being made up of at least four beam-like shielding elements of at least identical design uniformly distributed over a common cylinder surface.
Claim 3
Dependent Claim
16 words
The improvement according to claim 1, wherein said beam-shaped shielding elements have a rectangular cross-sectional shape.
Claim 4
Dependent Claim
15 words
The improvement according to claim 1, wherein said beam-shaped shielding elements have triangular cross sections.
Claim 5
Dependent Claim
31 words
The improvement according to claim 3, and further including insertable rings for reducing the radius of the openings in said washer-shaped end plates of the shielding device to a predetermined value.
Claim 6
Dependent Claim
31 words
The improvement according to claim 2, and further including insertable rings for reducing the radius of the openings in said washer-shaped end plates of the shielding device to a predetermined value.
Claim 7
Dependent Claim
31 words
The improvement according to claim 1, and further including insertable rings for reducing the radius of the openings in said washer-shaped end plates of the shielding device to a predetermined value.
Claim 8
Dependent Claim
24 words
The improvement according to claim 6, wherein said magnet coils being superconducting are disposed within a cryostat which is surrounded by the shielding device.
Claim 9
Dependent Claim
24 words
The improvement according to claim 5, wherein said magnet coils being superconducting are disposed within a cryostat which is surrounded by the shielding device.
Claim 10
Dependent Claim
24 words
The improvement according to claim 4, wherein said magnet coils being superconducting are disposed within a cryostat which is surrounded by the shielding device.
Claim 11
Dependent Claim
24 words
The improvement according to claim 3, wherein said magnet coils being superconducting are disposed within a cryostat which is surrounded by the shielding device.
Claim 12
Dependent Claim
24 words
The improvement according to claim 2, wherein said magnet coils being superconducting are disposed within a cryostat which is surrounded by the shielding device.
Claim 13
Dependent Claim
25 words
The improvement according to claim 1, wherein said superconducting magnet coils are being superconducting disposed within a cryostat which is surrounded by the shielding device.
Claim 14
Dependent Claim
24 words
The improvement according to claim 12, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
Claim 15
Dependent Claim
24 words
The improvement according to claim 9, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
Claim 16
Dependent Claim
24 words
The improvement according to claim 6, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
Claim 17
Dependent Claim
24 words
The improvement according to claim 5, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
Claim 18
Dependent Claim
24 words
The improvement according to claim 4, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
Claim 19
Dependent Claim
24 words
The improvement according to claim 3, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
Claim 20
Dependent Claim
24 words
The improvement according to claim 2, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
Claim 21
Dependent Claim
24 words
The improvement according to claim 1, wherein said shielding device at the same time is used as a mechanical mounting for the magnet coils.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |