Patent US4160167A successfully refreshed from Google Patents.
US4160167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the absorption of radiation in a slice of a body
Assignee: US Philips Corp
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Filing: 1977-05-16
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Granted: 1979-07-03
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Expires: 1997-05-16
Abstract
Abstract In third generation computer tomography apparatus, wherein radiation behind the object is measured by means of a large number of detection elements, a detection device comprises a number of detection elements which is larger than necessary for the measurement of the fan-shaped radiation beam, per se, in a direction parallel to the axis of rotation. Means are included for displacing the detection device in the direction of the axis of rotation. Detector element unbalance effects are thus averaged.
Inventors
- 👤 Hermann Weiss
- 👤 Gunter Kowalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:41
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/42; A61B6/4208; A61B6/4225; A61B6/02; A61B6/03; A61B6/032
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A device for measuring the absorption of radiation in a slice of a body, comprising a radiator means for generating a fan-shaped radiation beam which irradiates the body during a measurement, and a detection device which is disposed in the radiation beam and which measures measuring values describing the absorption of radiation in the slice of the body, the radiator and the detection device occupying a large number of rotary positions around an axis of rotation which extends perpendicularly to the radiation and the slice during the measurement, wherein the detection device comprises a series of detection elements disposed in a direction parallel to the axis of rotation, the length of the said series being larger than the thickness of the fan-shaped radiation beam, and further comprising displacement means for displacing the series during the measurement in a direction parallel to the axis
Claim 2
Independent Claim
143 words
A device for measuring the absorption of radiation in a slice of a body, comprising a radiator means for generating a fan-shaped radiation beam which irradiates the body during a measurement, and a detection device which is disposed in the radiation beam and which measures measuring values describing the absorption of radiation in the slice of the body, the radiator and the detection device occupying a large number of rotary positions around an axis of rotation which extends perpendicularly to the radiation and the slice during the measurement, wherein the detection device comprises a series of detection elements disposed in a direction parallel to the axis of rotation, the length of the said series being larger than the thickness of the fan-shaped radiation beam, and further comprising displacement means for displacing the series during the measurement in a direction parallel to the axis
Claim 3
Dependent Claim
60 words
A device as claimed in claim 1, wherein the detection device comprises a rectangular matrix of discrete detection elements which are disposed in a direction parallel to the axis of rotation as well as in a direction perpendicular thereto, all of the detection elements being displaceable, during the measurement, at the same speed and parallel to the axis of rotation.
Claim 4
Dependent Claim
52 words
A device as claimed in claim 1, wherein the detection device comprises a number of series of detection elements which extend parallel to the axis of rotation and which are displaceable parallel to the axis of rotation at different speeds, the speed of series in the center of the device being highest.
Claim 5
Dependent Claim
24 words
A device as claimed in claim 1, wherein the detection device comprises an image intensifier which is displaceable parallel to the axis of rotation.
Claim 6
Dependent Claim
53 words
A device as claimed in claim 1 wherein the angle subtended by the detection device in a direction perpendicular to the axis of rotation is larger than the angle enclosed by the fan-shaped radiation beam and the detection device is displaceable in the direction perpendicular to the axis of rotation during the measurement.
Claim 7
Dependent Claim
16 words
A device as claimed in claim 1, wherein the detection device is rotated during the measurement.
Claim 8
Dependent Claim
16 words
A device as claimed in claim 4, wherein the detection device is rotated during the measurement.
References Cited (Backward Citations)
US3937965A
Cited
US4047041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |