US4731807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray examination apparatus
Assignee: General Electric CGR SA
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Filing: 1986-09-29
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Granted: 1988-03-15
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Expires: 2006-09-29
Abstract
Abstract The present invention concerns an X-ray examination apparatus allowing to produce images of an object through the scanning of the object by at least two fan-shaped beams having different energy spectra, and obtained from a single X-ray source, thereby allowing to obtain simultaneously images of the object adapted to contain different informations.
Inventors
- 👤 Andre Plessis
- 👤 Emile Gabbay
- 👤 Jacques Trotel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:14
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/40; A61B6/4035; A61B6/4064; A61B6/4085; G; G21; G21K; G21K1/00; G21K1/02; G21K1/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
An X-ray examination apparatus comprising an X-ray tube producing X-rays, collimation means defining a first and a second separated fan-shaped flat beams of said X-rays, means for scanning an object by said first and second fan-shaped beams along a mean direction substantially perpendicular to the planes of said first and second fan-shaped flat beams, receiving means sensitive to the X-rays, means for conferring to each said first and second beams a different energy radiation spectra prior to their crossing through the object to be examined, and wherein the receiving means comprise a first and a second receiving assemblies each forming a shadow image of the object respectively from the first and the second fan-shaped flat beam in order to simultaneously obtain at least two images of the object.
Claim 2
Dependent Claim
128 words
An X-ray examination apparatus comprising an X-ray tube producing X-rays, collimation means defining a first and a second separated fan-shaped flat beams of said X-rays, means for scanning an object by said first and second fan-shaped beams along a mean direction substantially perpendicular to the planes of said first and second fan-shaped flat beams, receiving means sensitive to the X-rays, means for conferring to each said first and second beams a different energy radiation spectra prior to their crossing through the object to be examined, and wherein the receiving means comprise a first and a second receiving assemblies each forming a shadow image of the object respectively from the first and the second fan-shaped flat beam in order to simultaneously obtain at least two images of the object.
Claim 3
Dependent Claim
46 words
X-ray examination apparatus according to claim 1, wherein said means for conferring upon the first and second beams different energy spectra, comprise at least one physical filter having a thickness disposed on the path of the one or the other of said first and second beams.
Claim 4
Dependent Claim
53 words
X-ray examination apparatus according to claim 1, wherein said means for conferring upon said beams different spectra comprise a first and a second physical filter having thickness and of different X-ray properties, and disposed respectively on the path of the first and second beams prior to said beams crossing through the said object.
Claim 5
Dependent Claim
38 words
X-ray examination apparatus according to claim 1, wherein said first and second receiving assemblies comprise respectively a first and a second detecting strip exposed respectively by said first and second beams and each connected to a processing unit.
Claim 6
Dependent Claim
27 words
X-ray examination apparatus according to claim 4, wherein said first and second detecting strips are displaced during a scanning movement synchronized with said first and second beams.
Claim 7
Dependent Claim
13 words
X-ray examination apparatus according to claim 4 further comprising means for absorbing X-rays.
Claim 8
Dependent Claim
44 words
X-ray examination apparatus according to claim 6, wherein said means for absorbing the diffused X-rays are constituted by a plate disposed between said object and said first and second detecting strips and comprising a first and a second slot located facing said detecting strips.
Claim 9
Dependent Claim
17 words
X-ray examination apparatus according to claim 7, wherein said plate is made integral with the detecting strips.
Claim 10
Dependent Claim
20 words
X-ray examination apparatus according to claim 2, wherein said physical filters are disposed at an exit of the collimation means.
Claim 11
Dependent Claim
39 words
X-ray examination apparatus according to claim 2, wherein each physical filter is constituted from a material of which an absorption discontinuity is located at a wavelength corresponding to an energy limit conferred to the radiation spectra of said beams.
Claim 12
Dependent Claim
29 words
X-ray examination apparatus according to claim 2, wherein the intensity of the radiation spectrum of said beams is limited at low energies by the thickness of said physical filters.
References Cited (Backward Citations)
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |