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US4754469A
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Method for the determination of the spatial distribution of the scattering cross-sections for elastically scattered X-ray radiation and arrangement for implementation of the method
Assignee: US Philips Corp
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Filing: 1986-07-11
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Granted: 1988-06-28
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Expires: 2006-07-11
Abstract
Abstract The invention relates to a method for determination of the cross-sections for elastic scattered radiation in which a polychromatic radiation source is used but in which good differentiation between various substances is still possible.
Inventors
- 👤 Geoffrey Harding
- 👤 Josef-Maria Kosanetzky
- 👤 Ulrich Neitzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:43
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/20; G01N23/201; G21; G21K; G21K2207/00; G21K2207/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
Method for determining the spatial distribution of the scattering cross-sections for elastically scattered X-ray radiation passing through an area of examination comprising the steps of: irradiating, with a primary X-ray beam of small cross-section, the area of examination; detecting the scattered radiation leaving the examination area at different angles using a plurality of detectors; selecting the energy of the X-ray quata in the primary beam and the angular range at which the detectors detect the scattered radiation so that the proportion of elastically scattered radiation predominates therein; measuring the energy of the X-ray quanta; determining the spatial distribution of the scattering cross-section for elastically scattered X-ray radiation by ordering the detected X-ray quanta into groups; and counting the number of detected quanta in each group where each group comprises the X-ray quanta for which the product of scattering angle and energy is at least approximately the same.
Claim 2
Dependent Claim
147 words
Method for determining the spatial distribution of the scattering cross-sections for elastically scattered X-ray radiation passing through an area of examination comprising the steps of: irradiating, with a primary X-ray beam of small cross-section, the area of examination; detecting the scattered radiation leaving the examination area at different angles using a plurality of detectors; selecting the energy of the X-ray quata in the primary beam and the angular range at which the detectors detect the scattered radiation so that the proportion of elastically scattered radiation predominates therein; measuring the energy of the X-ray quanta; determining the spatial distribution of the scattering cross-section for elastically scattered X-ray radiation by ordering the detected X-ray quanta into groups; and counting the number of detected quanta in each group where each group comprises the X-ray quanta for which the product of scattering angle and energy is at least approximately the same.
Claim 3
Dependent Claim
129 words
Arrangement for implementing spatial distribution of scattering cross-sections for elastically scattered X-ray radiation comprising an X-ray radiator providing a primary beam of X-rays; means for masking said primary beam to form rays of small cross-section; detectors with defined spatial positions relative to said primary beam; and means for displacing said rays of small cross-seciton at an area of examination, wherein the improvement comprises said detectors being configured during detection of X-ray quanta to generate pulses having an amplitude dependent on energy of the X-ray quanta; pulse height discriminators connected after said detectors; means for generating signals proportional to the product of measured energy and scattering angle; and storage means for storing the number of times said product signals achieve a given value corresponding to a given area of examination.
Claim 4
Dependent Claim
129 words
Arrangement for implementing spatial distribution of scattering cross-sections for elastically scattered X-ray radiation comprising an X-ray radiator providing a primary beam of X-rays; means for masking said primary beam to form rays of small cross-section; detectors with defined spatial positions relative to said primary beam; and means for displacing said rays of small cross-seciton at an area of examination, wherein the improvement comprises said detectors being configured during detection of X-ray quanta to generate pulses having an amplitude dependent on energy of the X-ray quanta; pulse height discriminators connected after said detectors; means for generating signals proportional to the product of measured energy and scattering angle; and storage means for storing the number of times said product signals achieve a given value corresponding to a given area of examination.
Claim 5
Dependent Claim
48 words
Arrangement according to claim 2, wherein amplifier means are connected between each detector and a corresponding pulse height discriminator, wherein said amplifier means has a gain proportional to said scattering angle, and wherein each said detector coupled to said amplifier means detects scattered radiation for said scattering angle.
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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |