US4644276A
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Three-dimensional nuclear magnetic resonance phantom
Assignee: General Electric Co
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Filing: 1984-09-17
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Granted: 1987-02-17
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Expires: 2004-09-17
Abstract
Abstract Three-dimensional NMR phantom includes in the preferred embodiment a set of three mutually orthogonal test plates each configured to enable testing NMR scanner performance in each of the planes containing the plates. The plates are further arranged so as to be simultaneously positionable, in use, at the isocenter of the NMR scanner to permit testing NMR scanner performance in each plane without repositioning the phantom.
Inventors
- 👤 Thomas J. Sierocuk
- 👤 Robert W. Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:06
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/58
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A phantom for testing the performance of an NMR scanner having the capability of acquiring NMR data from nuclei situated in a plurality of planes within a test object, said phantom comprising: at least first and second test-plate means each including means for testing at least one performance parameter of the NMR scanner, said test-plate means lying in first and second planes and being arranged relative to one another so as to have at least a common center point positionable in use at the isocenter of the NMR scanner to enable NMR scanner performance tests to be performed in each of the planes containing said test plates without repositioning the phantom.
Claim 2
Dependent Claim
111 words
A phantom for testing the performance of an NMR scanner having the capability of acquiring NMR data from nuclei situated in a plurality of planes within a test object, said phantom comprising: at least first and second test-plate means each including means for testing at least one performance parameter of the NMR scanner, said test-plate means lying in first and second planes and being arranged relative to one another so as to have at least a common center point positionable in use at the isocenter of the NMR scanner to enable NMR scanner performance tests to be performed in each of the planes containing said test plates without repositioning the phantom.
Claim 3
Dependent Claim
82 words
The phantom of claim 1 further comprising a third test-plate means including means for testing at least one performance parameter of the NMR scanner, said third test-plate means lying in a third plane and having a common center point with said first and second test-plate means, said center point being positionable in use at the isocenter of the NMR scanner to enable NMR scanner performance tests to be performed in each of the planes containing said test plates without repositioning said phantom.
Claim 4
Dependent Claim
14 words
The phantom of claim 2 wherein said test-plate means are perpendicular to one another.
Claim 5
Dependent Claim
24 words
The phantom of claim 3 wherein said first, second, and third planes correspond to the axial, sagittal and coronal planes of said test object.
Claim 6
Dependent Claim
28 words
The phantom of claims 1, 2, 3, or 4 further comprising a shell for enclosing said test-plate means, said shell being capable of confining therein an NMR-active material.
Claim 7
Dependent Claim
35 words
The phantom of claim 5 further comprising position marker means to enable said phantom to be identically repositioned within said scanner in the course of performing a plurality of temporally spaced NMR scanner performance tests.
Claim 8
Dependent Claim
41 words
The phantom of claim 5 wherein said means for testing comprises an image distortion grid made up of a plurality of cells fabricated in a rectilinear pattern on the face of said test-plate means and adapted for holding an NMR-active material.
Claim 9
Dependent Claim
20 words
The phantom of claim 7 wherein said plurality of cells is in fluid communication with the interior of said shell.
Claim 10
Dependent Claim
48 words
The phantom of claim 5 wherein said means for testing comprises means for testing image uniformity, said means for testing image uniformity including at least one channel filled with an NMR-active material, which channel is fabricated in a substantially straight line across the face of said test-plate means.
Claim 11
Dependent Claim
18 words
The phantom of claim 9 wherein said channel is in fluid communication with the interior of said shell.
Claim 12
Dependent Claim
46 words
The phantom of claim 5 wherein said means for testing comprises at least one image resolution grid made up of a series of cells fabricated a predetermined distance from one another on the face of said test-plate means and being adapted for holding an NMR-active material.
Claim 13
Dependent Claim
20 words
The phantom of claim 11 wherein said series of cells are in fluid communication with the interior of said shell.
Claim 14
Dependent Claim
48 words
The phantom of claim 5 wherein said means for testing comprises means for performing a contrast ratio test, said last-mentioned means including a plurality of compartments for holding NMR-active materials which differ in their NMR properties from one another and from the NMR-active material containable in said shell.
Claim 15
Dependent Claim
22 words
The phantom of claim 13 wherein said NMR-active material in each of said compartments comprises one of glycerine and aqueous solutions thereof.
Claim 16
Dependent Claim
43 words
The phantom of claim 5 wherein said means for testing comprises at least one compartment isolated from the interior of said shell and capable of holding an NMR-active material which differs in its NMR properties from the NMR-active material containable in said shell.
Claim 17
Dependent Claim
18 words
The phantom of claim 5 wherein said means for testing comprises means useful for determining the signal-to-noise ratio.
Claim 18
Dependent Claim
27 words
The phantom of claim 5 wherein said means for testing comprises means useful for determining the thickness of a slice in said test object selected for imaging.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |