Patent US5666395A successfully refreshed from Google Patents.
US5666395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray diagnostic apparatus
Assignee: Canon Medical Systems Corp
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Filing: 1996-09-17
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Granted: 1997-09-09
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Expires: 2016-09-17
Abstract
Abstract It is an object of the invention to provide an X-ray diagnosis apparatus having an X-ray plane detector capable of removing the influence of a scattered X-ray by using a grid and also preventing a Moire image. An X-ray image transmitted through a target object is sensed by a plane detector in units of pixels which are two-dimensionally arranged at a predetermined pitch. A scattered X-ray incident on the plane detector is removed by a scattered ray removing grid having plate-like X-ray shielding members and arranged on an X-ray incident side of the plane detector. The X-ray shielding members are arranged such that an X-ray shielding pattern on the X-ray incident surface of the plane detector has a pitch corresponding to an integer fraction of the arrangement pitch of the pixels. When a steady positional relationship is kept between the pitch of the X-ray detection elements and the period of the fringe pattern of the X-ray which is shielded by the grid, a Moire image can be prevented.
Inventors
- 👤 Akira Tsukamoto
- 👤 Masayuki Nishiki
- 👤 Koichiro Nabuchi
- 👤 Shin-ichi Yamada
- 👤 Tohru Saisu
- 👤 Takayuki Tomisaki
- 👤 Manabu Tanaka
- 👤 Seiichiro Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:22
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/29; G01T1/2914; G01T1/2921; G01T1/2928; A; A61; A61B; A61B6/00; A61B6/52; A61B6/5258; A61N; A61N5/00; A61N5/10; A61N5/103; G21; G21K; G21K1/00; G21K1/02; G21K1/025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
An X-ray diagnosis apparatus comprising: means for irradiating an X-ray on a target object; means, having pixels which are two-dimensionally arranged at a predetermined pitch, for sensing an X-ray image transmitted through said target object; and a scattered X-ray shielding grid which has X-ray shielding members which are arranged at a pitch corresponding to an integer fraction of the predetermined pitch of said pixels.
Claim 2
Dependent Claim
64 words
An X-ray diagnosis apparatus comprising: means for irradiating an X-ray on a target object; means, having pixels which are two-dimensionally arranged at a predetermined pitch, for sensing an X-ray image transmitted through said target object; and a scattered X-ray shielding grid which has X-ray shielding members which are arranged at a pitch corresponding to an integer fraction of the predetermined pitch of said pixels.
Claim 3
Dependent Claim
21 words
An apparatus according to claim 1, wherein the pitch of said X-ray shielding members equals the arrangement pitch of said pixels.
Claim 4
Dependent Claim
20 words
An apparatus according to claim 1, further comprising a portable cassette-like case to cover said sensing means and said grid.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 1, further comprising a stationary cassette-like case to cover said sensing means and said grid.
Claim 6
Dependent Claim
48 words
An apparatus according to claim 1, wherein said sensing means comprises: a fluorescent plate for converting the X-ray image into an optical image; and a plurality of photodetection elements for converting the optical image from said fluorescent plate into an image signal, the elements corresponding to said pixels.
Claim 7
Dependent Claim
32 words
An apparatus according to claim 1, wherein said sensing means comprises a plurality of X-ray image detection elements for converting the X-ray into an image signal, the elements corresponding to said pixels.
Claim 8
Dependent Claim
78 words
An X-ray diagnosis apparatus comprising: means for irradiating an X-ray on a target object; means, having pixels which are two-dimensionally arranged at a predetermined pitch, for sensing an X-ray image transmitted through said target object; and a scattered X-ray shielding grid which has X-ray shielding members which are arranged at a pitch corresponding to an integer fraction of the predetermined pitch of said pixels, wherein said X-ray shielding members overlap an X-ray dead portion of said sensing means.
Claim 9
Dependent Claim
78 words
An X-ray diagnosis apparatus comprising: means for irradiating an X-ray on a target object; means, having pixels which are two-dimensionally arranged at a predetermined pitch, for sensing an X-ray image transmitted through said target object; and a scattered X-ray shielding grid which has X-ray shielding members which are arranged at a pitch corresponding to an integer fraction of the predetermined pitch of said pixels, wherein said X-ray shielding members overlap an X-ray dead portion of said sensing means.
Claim 10
Dependent Claim
76 words
A X-ray diagnosis method using an X-ray plane detector, comprising the following steps of: irradiating an X-ray from an X-ray tube on a target object; and sensing an X-ray image transmitted through said target object by using a plane detector having pixels which are two-dimensionally arranged at a predetermined pitch and having a scattered X-ray shielding grid including X-ray shielding members having a pitch corresponding to an integer fraction of arrangement said pitch of said pixels.
Claim 11
Dependent Claim
76 words
A X-ray diagnosis method using an X-ray plane detector, comprising the following steps of: irradiating an X-ray from an X-ray tube on a target object; and sensing an X-ray image transmitted through said target object by using a plane detector having pixels which are two-dimensionally arranged at a predetermined pitch and having a scattered X-ray shielding grid including X-ray shielding members having a pitch corresponding to an integer fraction of arrangement said pitch of said pixels.
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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) | 2000-09-08 | 2001-03-10 | 2001-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-08 | 2005-03-10 | 2005-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-08 | 2009-03-10 | 2009-09-09 | $7700.00 | Window Closed / Lapsed |