Patent US3818575A successfully refreshed from Google Patents.
Patent US4999500A successfully refreshed from Google Patents.
US4999500A
Expired / Lapsed
US
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Apparatus for radiographic imaging
Assignee: Yeda Research and Development Co Ltd
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Filing: 1989-10-31
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Granted: 1991-03-12
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Expires: 2009-10-31
Abstract
Abstract Apparatus for radiographic imaging including a multistage avalanche chamber receiving radiation from a multiplicity of radiation point sources on a sample and providing a multiple photon output indicative of the path of the emitted radiation through the avalanche chamber, image intensification apparatus receiving the photon output of the avalanche chamber, a camera receiving an output from the image intensification apparatus; image processing apparatus for receiving the camera output and carrying out a vector analysis on the information contained in the camera output in order to determine the location of the radiation emitting point source on the sample.
Inventors
- 👤 Amos Breskin
- 👤 Rachel Chechik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:11
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/29; G01T1/2914; G01T1/2921; G01T1/2935
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
Apparatus for radiographic imaging comprising: a multistage avalanche chamber receiving radiation from a multiplicity of radiation point sources on a sample and providing a multiple photon output indicative of the path of the emitted radiation through the avalanche chamber; image intensification means receiving the photon output of the avalanche chamber; a camera receiving an output from the image intensification means; and image processing means for receiving the camera output and carrying out a vector analysis on the information contained in the camera output in order to determine the location of the radiation emitting point source on the sample.
Claim 2
Dependent Claim
98 words
Apparatus for radiographic imaging comprising: a multistage avalanche chamber receiving radiation from a multiplicity of radiation point sources on a sample and providing a multiple photon output indicative of the path of the emitted radiation through the avalanche chamber; image intensification means receiving the photon output of the avalanche chamber; a camera receiving an output from the image intensification means; and image processing means for receiving the camera output and carrying out a vector analysis on the information contained in the camera output in order to determine the location of the radiation emitting point source on the sample.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1 and wherein said camera comprises a CCD camera.
Claim 4
Dependent Claim
40 words
Apparatus according to claim 1 or claim 2 and wherein said avalanche chamber comprises a plurality of gas-filled regions separated from each other by wire grids and including a preamplification region, a charge amplification region, and a light amplification region.
Claim 5
Dependent Claim
15 words
Apparatus according to claim 3 and wherein said avalanche chamber also includes a gate region.
Claim 6
Dependent Claim
17 words
Apparatus according to claim 1 or 2 and wherein said image processing means includes frame grabber circuitry.
Claim 7
Dependent Claim
27 words
Apparatus according to claim 1 or 2 and wherein said avalanche chamber also includes a coincidence detector and means for gating in response to the output thereof.
Claim 8
Dependent Claim
27 words
Apparatus according to claim 1 or 2 and wherein said avalanche chamber also includes an anti-coincidence detector and means for gating in response to the output thereof.
Claim 9
Dependent Claim
17 words
Apparatus according to claim 7 and wherein said anticoincidence detector is associated with an optically transparent window.
Claim 10
Dependent Claim
16 words
Apparatus according to claim 7 and wherein said anticoincidence detector is associated with a opaque window.
Claim 11
Independent Claim
91 words
A method for radiographic imaging comprising the steps of: receiving radiation from a multiplicity of radiation point sources on a sample at an avalanche chamber and providing a multiple photon output indicative of the path of the emitted radiation through the avalanche chamber; receiving the photon output of the avalanche chamber and providing an image intensified output; sensing the image intensified output; and carrying out a vector analysis on the information contained in the camera output in order to determine the location of the radiation emitting point source on the sample.
Claim 12
Independent Claim
91 words
A method for radiographic imaging comprising the steps of: receiving radiation from a multiplicity of radiation point sources on a sample at an avalanche chamber and providing a multiple photon output indicative of the path of the emitted radiation through the avalanche chamber; receiving the photon output of the avalanche chamber and providing an image intensified output; sensing the image intensified output; and carrying out a vector analysis on the information contained in the camera output in order to determine the location of the radiation emitting point source on the sample.
Claim 13
Dependent Claim
161 words
A method according to claim 10 and wherein said step of carrying out a vector analysis comprises the steps of: initially scanning an image frame to identify groups of adjacent pixels i,j in which the intensity distribution of the image V i ,j is above a given threshold; storing each such group for further analysis; for each group, determining the projection of the pathway of the radiation in a plane parallel to the plane of the sample; determining the direction of the radiation pathway along the projection; determining the maxima of the image intensity in the plane of the projection; applying a geometric correction to the location of the maximum to take into account the finite spatial separation between the plane of the projection and the plane of the sample along an axis perpendicular to those planes, to determine the point of origin of the radiation in the sample; and repeating the foregoing steps following the storing steps for each group.
Claim 14
Independent Claim
30 words
A method according to either of claims 10 and 11 and also comprising the step of gating using the output of at least one of a coincidence or anti-coincidence detector.
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) | 1994-03-11 | 1994-09-10 | 1995-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-11 | 1998-09-10 | 1999-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-11 | 2002-09-10 | 2003-03-12 | $7700.00 | Window Closed / Lapsed |