EP0105618A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
X-Ray imaging system having radiation scatter compensation and method
Assignee: Leland Stanford Junior University
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Filing: 1983-09-02
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Granted: —
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Expires: 2003-09-02
Abstract
Abstract The image signal in a radiation imaging system is improved by establishing a scattered radiation signal and subtracting the scatter radiation signal from the detected radiation signal. The scatter radiation signal is established by shielding portions of the detector and measuring radiation at the shielded portions of the detector. The total scatter radiation signal is interpolated from spatial distribution of the radiation measured at the shielded areas.
Inventors
- 👤 Albert Macovski (Nmi)
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 17:45
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/48; A61B6/483; G; G01; G01N; G01N23/00; G01N23/02; G01N23/04; G21; G21K; G21K1/00; G21K1/02; G21K1/025; A61B6/482
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
An X-ray imaging system comprising an X-ray source, an X-ray detector means positioned to receive and detect X-radiation from the source and generate an electrical signal indication thereof, radiation shield means positioned between the source and the detector means to prevent radiation from passing directly to shielded areas of the detector means, interpolation means for receiving electrical signals from the detector means indicative of scattered radiation received by the shielded areas of the detector means and for interpolating therefrom a scattered radiation signal for all of the detector means, and means for subtracting the interpolated scattered radiation signal from the electrical signal generated by the detector means.
Claim 2
Dependent Claim
107 words
An X-ray imaging system comprising an X-ray source, an X-ray detector means positioned to receive and detect X-radiation from the source and generate an electrical signal indication thereof, radiation shield means positioned between the source and the detector means to prevent radiation from passing directly to shielded areas of the detector means, interpolation means for receiving electrical signals from the detector means indicative of scattered radiation received by the shielded areas of the detector means and for interpolating therefrom a scattered radiation signal for all of the detector means, and means for subtracting the interpolated scattered radiation signal from the electrical signal generated by the detector means.
Claim 3
Dependent Claim
47 words
An X-ray imaging system as claimed in claim 1 wherein the shield means comprises a plurality of radiation opaque bodies positioned between the source and the detector means and spatially distributed for facilitating interpolation of a scattered radiation signal for all the area of the detector means.
Claim 4
Dependent Claim
37 words
An X-ray inaging system as claimed in claim 1 or claim 2 wherein the shield means comprises a beam collimator for limiting the geometry of an X-ray beam received by the detector means directly from the source.
Claim 5
Dependent Claim
26 words
An X-ray imaging system as claimed in any one of the preceding claims wherein the X-ray detector means comprises an image intensifier and a TV camera.
Claim 6
Dependent Claim
84 words
A method of compensating for scatter radiation in an X-ray imaging system as claimed in claim 1 comprising the steps of positioning radiation shield means between the radiation source and the radiation detector means, measuring radiation received by the radiation detector means at the shielded areas, interpolating scattered radiation for all of the detector means from the measured radiation at the shielded areas, measuring radiation received by the radiation means at all unshielded areas, and subtracting the interpolated scattered radiation from the measured X-radiation.
Claim 7
Dependent Claim
15 words
A method as claimed in claim 5 wherein the steps of measuring radiation are concurrent.
Claim 8
Dependent Claim
23 words
A method as claimed in claim 5 including the step of removing the radiation shield and measuring the radiation received at all areas.
References Cited (Backward Citations)
No citation records indexed.
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