US4551678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phantom for nuclear magnetic resonance machine
Assignee: The University of Texas System
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Filing: 1982-11-26
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Granted: 1985-11-05
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Expires: 2002-11-26
Abstract
Abstract A phantom for an NMR machine is disclosed that includes a plurality of containers each filled with a material having a known spin density, T1, or T2 characteristic that differs a preselected amount from the spin density, T1, or T2 characteristics of the material in at least a portion of the other containers.
Inventors
- 👤 Tommie J. Morgan
- 👤 M. Robert Willcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:15
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/58
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
A phantom for use with an NMR machine comprising a plurality of concentric tubes of non-magnetic material, such as glass, each of which contain a material having a known spin density, T1, or T2 characteristic that differs a preselected amount from the spin density, T1, or T2 characteristics of the material in at least a portion of the other tubes, said tubes being connected in the form of a polyhedron.
Claim 2
Dependent Claim
70 words
A phantom for use with an NMR machine comprising a plurality of concentric tubes of non-magnetic material, such as glass, each of which contain a material having a known spin density, T1, or T2 characteristic that differs a preselected amount from the spin density, T1, or T2 characteristics of the material in at least a portion of the other tubes, said tubes being connected in the form of a polyhedron.
Claim 3
Dependent Claim
100 words
A phantom for an NMR machine comprising a plurality of tubes of non-magnetic mterial, such as glass, each of which contain a material having a known spin density, T1 or T2 characteristic that differs a preselected amount from the spin density, T1, or T2 characteristics of the material in the other tubes, said tubes having several different diameters ranging from a tube diameter that the machine cannot resolve up to a tube diameter that the machine can resolve and means for supporting the tubes in a predetermined arrangement in a NMR machine to measure the performance characteristics of the machine.
Claim 4
Dependent Claim
100 words
A phantom for an NMR machine comprising a plurality of tubes of non-magnetic mterial, such as glass, each of which contain a material having a known spin density, T1 or T2 characteristic that differs a preselected amount from the spin density, T1, or T2 characteristics of the material in the other tubes, said tubes having several different diameters ranging from a tube diameter that the machine cannot resolve up to a tube diameter that the machine can resolve and means for supporting the tubes in a predetermined arrangement in a NMR machine to measure the performance characteristics of the machine.
Claim 5
Dependent Claim
16 words
The phantom of claim 2 in which the different diameter tubes are arranged in concentric groups.
Claim 6
Dependent Claim
21 words
The phantom of claim 3 in which the concentric groups of tubes are arranged to form the framework of a polyhedron.
Claim 7
Dependent Claim
62 words
The phantom of claim 2 in which the supporting means includes a base member of non-magnetic material having a plurality of holes therein, a mounting plate for supporting the containers, and a mounting pin attached to the mounting plate for insertion in a selected hole in the base member to locate the containers in one of several available positions in the machine.
Claim 8
Dependent Claim
45 words
The phantom of claim 5 in which the base member is a four sided box having holes in preselected positions in its sides and bottom to support containers in the box through which the characteristic of the liquid can be measured along mutually perpendicular planes.
Claim 9
Dependent Claim
51 words
A phatom for use with an NMR machine comprising a plurality of elongated containers connected together in the shape of a polyhedron with each container forming at least a part of each leg of the polyhedron and a material in each container having a known spin density, T1, or T2 characteristic.
Claim 10
Dependent Claim
51 words
A phatom for use with an NMR machine comprising a plurality of elongated containers connected together in the shape of a polyhedron with each container forming at least a part of each leg of the polyhedron and a material in each container having a known spin density, T1, or T2 characteristic.
Claim 11
Dependent Claim
34 words
The phantom of claim 7 in which at least some of the legs of the polyhedron include a plurality of said containers each containing material having a known spin density, T1, or T2 characteristic.
Claim 12
Dependent Claim
14 words
The phantom of claim 8 in which the plurality of containers are concentric tubes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |