Patent US5493601A successfully refreshed from Google Patents.
US5493601A
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Radiographic calibration phantom
Assignee: Agfa Gevaert NV
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Filing: 1994-12-01
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Granted: 1996-02-20
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Expires: 2014-12-01
Abstract
Abstract A phantom for determining attenuation by a combination of materials of polychromatic X-rays comprises a number of tubes that can be positioned in between a source emitting said X-rays and an X-ray detector. The tubes are held in a position so that they are directed towards the position of a source of radiation. In each tube a combination of thicknesses of said materials is provided.
Inventors
- 👤 Christiaan Fivez
- 👤 Pieter Vuylsteke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:03
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/58; A61B6/582; A61B6/583
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A calibration phantom for determining the attenuation of polychromatic X-rays emitted by an X-ray source by a combination of at least two materials, comprising (a) a number of tubes that can be positioned in between said source and a X-ray detector, (b) means for holding said tubes in a position so that their axes are directed towards the position of said source, (c) in each of said tubes a combination of samples of known thickness of said materials.
Claim 2
Dependent Claim
78 words
A calibration phantom for determining the attenuation of polychromatic X-rays emitted by an X-ray source by a combination of at least two materials, comprising (a) a number of tubes that can be positioned in between said source and a X-ray detector, (b) means for holding said tubes in a position so that their axes are directed towards the position of said source, (c) in each of said tubes a combination of samples of known thickness of said materials.
Claim 3
Dependent Claim
45 words
A phantom according to claim 1 wherein for each of said tubes a beam stop is provided above the piece of material that is positioned closest to said X-ray source so that said beam stop covers part of said material from being exposed to X-rays.
Claim 4
Dependent Claim
71 words
A phantom according to claim 1 wherein said means for holding the tubes comprise a first plate having provisions for holding said tubes and said materials, at least a part of said provisions being transparent to X-rays so that X-rays can be detected; a second plate having holes through which said tubes can be slided, first and second plate being relatively positioned so that the tubes are directed towards said source.
Claim 5
Dependent Claim
19 words
A phantom according to claim 1 wherein the side-walls of the tubes are provided with X-ray penetration prohibiting means.
Claim 6
Dependent Claim
21 words
A phantom according to claim 1 wherein means are provided to prevent X-ray detection by said detector in between said tubes.
Claim 7
Dependent Claim
26 words
A phantom according to claim 3 wherein at least one of said first plate and said second plate is opaque to X-rays in between said tubes.
Claim 8
Dependent Claim
35 words
A phantom according to claim 1 wherein all of said tubes have a cylindrical shape with an identical diameter and all of the samples of material have a cylindrical shape that fits into the tubes.
Claim 9
Dependent Claim
16 words
A phantom according to claim 3 wherein the distance between first and second plate is variable.
Claim 10
Dependent Claim
12 words
A phantom according to claim 8 wherein said second plate is displaceable.
References Cited (Backward Citations)
US2356358A
Cited
US4352020A
Cited
US4280047A
Cited
US4460832A
Cited
US4980904A
Cited
US4985906A
Cited
US4873707A
Cited
US5056130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |