Patent US1106561A successfully refreshed from Google Patents.
Patent US4715056A successfully refreshed from Google Patents.
US4715056A
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Apparatus for slit radiography
Assignee: OPTISCHE INDUSTRIE"DE OUDE DELFT" BV
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Filing: 1985-03-18
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Granted: 1987-12-22
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Expires: 2005-03-18
Abstract
Abstract An apparatus for slit radiography comprising an X-ray source, an X-ray detector positioned behind a body being irradiated, said detector collecting the radiation passed through the body, and a slit diaphragm placed between the X-ray source and the body being irradiated, through which diaphragm there is formed a planar X-ray fan beam, while for obtaining a complete X-ray shadow image of the desired part of the body at least the fan beam performs a scanning movement. There are provided detection means coacting with the X-ray detector and comprising a plurality of sections juxtaposed in the longitudinal direction of the strip-like portion of the X-ray detector irradiated through the slit diaphragm, each section being adapted to produce an electric signal depending upon the radiation impinging instantaneously on the associated section of the X-ray detector. The slit diaphragm comprises a plurality of sections juxtaposed in the longitudinal direction of the slit, each coacting with at least one controllable attenuation element and corresponding with the number of sections of the detection means, and is provided with control means which during the scanning movement instantaneously and simultaneously adjust the quantity of X-rays passed per section of the diaphragm, under the control of the electric signals generated by the detection means.
Inventors
- 👤 Hugo Vlasbloem
- 👤 Simon Duinker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:20
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/06; A61B6/40; A61B6/4035; G; G21; G21K; G21K1/00; G21K1/02; G21K1/04; G21K1/043; H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/36; H05G1/60; H05G1/64
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
167 words
An apparatus for slit radiography, which comprises: an X-ray source; an X-ray detector for collecting radiation passing through a body to be radiographed; a slit diaphragm positioned between said X-ray source and said body for forming a substantially planar X-ray beam; a plurality of attenuating elements positioned along said slit diaphragm forming a plurality of attenuating sections; means for scanning said body with said planar X-ray beam; detection means cooperating with saisd X-ray detector and comprising a plurality of response sections juxtaposed along a direction of said slit diaphragm, each of said response sections being responsive to radiation collected on said X-ray detector to produce an electric signal representative of intensity of thus collected radiation, each of said response sections of said detection means corresponding to a respective attenuating section of said plurality of attenuating sections; and means for simultaneously controlling each of said attenuating sections during scanning of said body in response to said electric signal produced at a respective response section of said detection means.
Claim 2
Independent Claim
167 words
An apparatus for slit radiography, which comprises: an X-ray source; an X-ray detector for collecting radiation passing through a body to be radiographed; a slit diaphragm positioned between said X-ray source and said body for forming a substantially planar X-ray beam; a plurality of attenuating elements positioned along said slit diaphragm forming a plurality of attenuating sections; means for scanning said body with said planar X-ray beam; detection means cooperating with saisd X-ray detector and comprising a plurality of response sections juxtaposed along a direction of said slit diaphragm, each of said response sections being responsive to radiation collected on said X-ray detector to produce an electric signal representative of intensity of thus collected radiation, each of said response sections of said detection means corresponding to a respective attenuating section of said plurality of attenuating sections; and means for simultaneously controlling each of said attenuating sections during scanning of said body in response to said electric signal produced at a respective response section of said detection means.
Claim 3
Dependent Claim
49 words
The apparatus as defined in claim 1 wherein said attenuating elements comprise a plurality of juxtaposed elements slidable relatively to each other in a direction transverse to said slit diaphragm, each of said attenuating elements being mounted to a slidable core of a coil energized by said control means.
Claim 4
Dependent Claim
15 words
The apparatus as defined in claim 2, wherein said attenuating elements are trapezoidal in cross-section.
Claim 5
Dependent Claim
22 words
The apparatus as defined in claim 2 wherein said attenuating elements engage each other by means of a tongue and groove joint.
Claim 6
Dependent Claim
33 words
The apparatus as defined in claim 2 wherein said attenuating elements include a central element and side elements resiliently connnected to said central element, said central element being controlled by said control means.
Claim 7
Dependent Claim
44 words
The apparatus as defined in claim 1 wherein each attenuating element includes one elongate element extending substantially transversely to a longitudinal direction of said slit diaphragm so that one end thereof is moved into said planar X-ray beam in response to said control means.
Claim 8
Dependent Claim
59 words
The apparatus as defined in claim 6 wherein each of said elongate elements are hinged between ends thereof to a member of said slit diaphragm or to a carrier extending parallel thereto and wherein at least some of the elements are each connected adjacent the other end to a slidable core of a coil energized by the control means.
Claim 9
Dependent Claim
33 words
The apparatus as defined in claim 7 wherein said attenuating elements include a central element and side elements resiliently connected to said central element, said central element being controlled by said control means.
Claim 10
Dependent Claim
47 words
The apparatus as defined in claim 6 wherein said attenuating elements comprise a resilient tongue attached at one end to a leg of a U-shaped coil core and having at another end a plate of magnetic material extending above the other leg of said U-shape ooil core.
Claim 11
Dependent Claim
33 words
The apparatus as defined in claim 9 wherein each resilient tongue mounted to a U-shaped coil core is connected resiliently to adjoining elongate and similarly oriented elements unresponsive to a U-shaped coil core.
Claim 12
Dependent Claim
50 words
The apparatus as defined in claim 6 wherein each of said elongate attenuating elements is a piezoelectric element, said piezoelectric element being curved in response to a voltage applied by said control means so that free end of said piezoelectric element reduces the effective slit width of said slit diaphragm.
Claim 13
Dependent Claim
24 words
The apparatus as defined in claim 6 wherein a free end of each elongate element is coated with a material for attenuating X-ray radiation.
Claim 14
Dependent Claim
51 words
The apparatus as defined in claim 1 wherein each attenuating element is a tube bridging said slit diaphragm and partly filled with a magnetic liquid having a portion to be drawn into said bridging portion by a magnetic field produced in response to an electric magnet energized by said control means.
Claim 15
Dependent Claim
82 words
The apparatus as defined in claim 1 wherein said X-ray detector is an elongate image intensifier tube of a proximity type moving in synchronism with scanning movement of said X-ray source and slit diaphragm, said iamge intensifier tube converting X-rays into a light image; and wherein said detection means comprises a series of photosensitive elements coupled to said elongate image intensifier tube, each viewing an associated portion of light image to produce an electric signal proportional to instantaneously collected quantity of light.
Claim 16
Dependent Claim
21 words
The apparatus as defined in claim 14 wherein a series of photosensitive elements are disposed in said elongate image intensifier tube.
Claim 17
Dependent Claim
56 words
The apparatus as defined in claim 1 wherein said X-ray detector is an elongate image intensifier tube of the proximity type comprising a matrix of charge-coupled devices as an anode, output signals of which are applied on one hand to said control means and on another hand to a processing device for forming said desired image.
Claim 18
Dependent Claim
40 words
The apparatus as defined in claim 1 wherein said X-ray detector is a stationary X-ray screen scanned in synchronism with scanning of said X-ray source and slit diaphragm by means of a photosensitive detector comprising a plurality of judxtaposed sections.
Claim 19
Dependent Claim
81 words
The apparatus as defined in claim 1 wherein said X-ray detector is a stationary X-ray screen coupled to a film cassette in a light-tight manner; and further including a second X-ray detector positioned behind said film cassette for collecting X-rays instantaneously passing through said film cassette to convert the same into corresponding quantities of light measured by means of a series of photosensitive elements in synchromism with scanning of the X-ray source and slit diaphragm and converted into corresponding electric signals.
Claim 20
Dependent Claim
55 words
The apparatus as defined in claim 1 wherein each attenuating section is comprised of a plurality of attenuating elements arranged in tandem each having a predetermined attenuation factor for X-radiation and wherein said control means are operative for selectively sliding said in tandem attenuating elements in dependence on a signal generated by said detection means.
Claim 21
Dependent Claim
56 words
The apparatus as defined in claim 1 wherein said X-ray detector is a stationary X-ray screen, and wherein said detection means is comprised of juxtaposed strips of photocondutive material absorbing small amounts of X-radiation and disposed at a side of said X-ray screen proximal to said body being radiographed extending transversely to a direction of scanning.
Claim 22
Dependent Claim
68 words
The apparatus as defined in claim 1 wherein said attenuating elements include juxtaposed coils each having a magnet pole with at least one row of magnet poles positioned parallel to said slit diaphragm, electric current flowing through each juxtaposed coil being determined by said planar X-ray beam to a greater or lesser extend in dependence on intensity of current thereto under the influence of an associated magnet pole.
Claim 23
Dependent Claim
27 words
The apparatus as defined in claim 21 wherein each coil is wound about a sleeve having an extended portion about a magnet pole to move relatively thereto.
Claim 24
Dependent Claim
34 words
The apparatus as defined in claim 21 wherein at least two rows of coils and associated magnet poles are arranged with one row of coils being staggered with reference to another row of coils.
Claim 25
Dependent Claim
21 words
The apparatus as defined in claim 21 wherein the magnet poles and the coils are inclined to the planar X-ray beam.
Claim 26
Dependent Claim
27 words
The apparatus as defined in claim 1 and further including end members to vary an effective length of said slit diaphragm in response to said control means.
Claim 27
Dependent Claim
37 words
The apparatus as defined in claim 1 wherein at least some of said attenuating elements are connected eccetrically through a connector to a shaft of a stepping motor, each stepping motor being controlled by said control means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |