Patent US4866744A successfully refreshed from Google Patents.
US4866744A
Expired / Lapsed
US
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Scattering beam eliminating device for x-ray CT apparatus
Assignee: Toshiba Corp
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Filing: 1988-09-06
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Granted: 1989-09-12
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Expires: 2008-09-06
Abstract
Abstract A scattering beam eliminating member is located between an X-ray tube and an X-ray gas detector such that it is intimately bonded to the window of the X-ray detector. The scattering beam eliminating member is of such a type that plates and X-ray transmission areas are alternately arranged in a slice direction to permit any scattering beam to be absorbed in the slice direction and never to be incident to the X-ray detector.
Inventors
- 👤 Tadatoki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:59
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
A scattering beam eliminating device for an X-ray CT apparatus including X-ray irradiation means for irradiating a fan-shaped X-ray beam to a patient, the fan-shaped X-ray beam having an X-ray illumination area defined in a fan-out direction and a slice direction, and an X-ray detector having an X-ray entrance surface and X-ray detection elements arranged in the fan-out direction to detect the X-ray incident thereto through the X-ray entrance surface, the detector detecting the X-ray which has penetrated the patient, the scattering beam eliminating device comprising: (A) a scattering beam eliminating member having an X-ray exit surface positioned on the X-ray entrance surface of the X-ray detector and fixed to the X-ray entrance surface, the scattering beam eliminating member including: (i) an array of substantially parallel plates made of an X-ray absorbing material and spaced apart in the slice direction; and (ii) a plurality of X-ray transmission areas, each located in the space between an adjacent pair of said plates and made of an X-ray transmitting material, and (B) a collimator disposed between said X-ray illumination means and said scattering beam eliminating member for defining an X-ray illumination area in a fan-out direction and a slice direction.
Claim 2
Dependent Claim
197 words
A scattering beam eliminating device for an X-ray CT apparatus including X-ray irradiation means for irradiating a fan-shaped X-ray beam to a patient, the fan-shaped X-ray beam having an X-ray illumination area defined in a fan-out direction and a slice direction, and an X-ray detector having an X-ray entrance surface and X-ray detection elements arranged in the fan-out direction to detect the X-ray incident thereto through the X-ray entrance surface, the detector detecting the X-ray which has penetrated the patient, the scattering beam eliminating device comprising: (A) a scattering beam eliminating member having an X-ray exit surface positioned on the X-ray entrance surface of the X-ray detector and fixed to the X-ray entrance surface, the scattering beam eliminating member including: (i) an array of substantially parallel plates made of an X-ray absorbing material and spaced apart in the slice direction; and (ii) a plurality of X-ray transmission areas, each located in the space between an adjacent pair of said plates and made of an X-ray transmitting material, and (B) a collimator disposed between said X-ray illumination means and said scattering beam eliminating member for defining an X-ray illumination area in a fan-out direction and a slice direction.
Claim 3
Dependent Claim
42 words
A scattering beam eliminating device according to claim 1, in which the X-ray entrance surface of the X-ray detector and said X-ray exit surface of said scattering beam eliminating member are curved in the fan-out direction and have substantially the same curvature.
Claim 4
Dependent Claim
28 words
A scattering beam eliminating device according to claim 1, in which said plates are made of a metal selected from the group consisting of lead, molybdenum and tungsten.
Claim 5
Dependent Claim
19 words
A scattering beam eliminating device according to claim 1, in which said X-ray transmission areas are made of aluminum.
Claim 6
Dependent Claim
36 words
A scattering beam eliminating device according to claim 1, in which each of said plates is 30 to 80 μm in thickness and said plates are spaced apart with a pitch of 100 to 200 μm.
Claim 7
Dependent Claim
149 words
An X-ray CT apparatus comprising: X-ray irradiation means for irradiating a fan-shaped X-ray beam to a patient, the fan-shaped X-ray beam having an X-ray illumination area defined in a fan-out direction and a slice direction; an X-ray detector, having an X-ray entrance surface, including substantially parallel plate-like X-ray detection elements for detecting X-ray radiation incident thereon said X-ray detection elements being spaced apart in said fan-out direction; a scattering beam eliminating member having an X-ray exit surface positioned on the X-ray entrance surface of the X-ray detector and fixed to the X-ray entrance surface, the scattering beam eliminating member including an array of substantially parallel, plates made of an X-ray absorbing material, spaced apart in the slice direction, and a plurality of X-ray transmission areas located in the space between an adjacent pair of said plates, said plurality of X-ray transmission areas being made of an X-ray transmitting material.
Claim 8
Dependent Claim
149 words
An X-ray CT apparatus comprising: X-ray irradiation means for irradiating a fan-shaped X-ray beam to a patient, the fan-shaped X-ray beam having an X-ray illumination area defined in a fan-out direction and a slice direction; an X-ray detector, having an X-ray entrance surface, including substantially parallel plate-like X-ray detection elements for detecting X-ray radiation incident thereon said X-ray detection elements being spaced apart in said fan-out direction; a scattering beam eliminating member having an X-ray exit surface positioned on the X-ray entrance surface of the X-ray detector and fixed to the X-ray entrance surface, the scattering beam eliminating member including an array of substantially parallel, plates made of an X-ray absorbing material, spaced apart in the slice direction, and a plurality of X-ray transmission areas located in the space between an adjacent pair of said plates, said plurality of X-ray transmission areas being made of an X-ray transmitting material.
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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |