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1. 发明专利

SE9904834D0 未知
公开(公告)号：SE9904834D0
公开(公告)日：1999-12-29
申请号：SE9904834
申请日：1999-12-29
申请人： DIGIRAY AB
发明人： FRANCKE TOM , ULLBERG CHRISTER , RANTANEN JUHA
IPC分类号： G01T1/185 , G01T1/18 , G01T1/29 , H01J47/02 , H01J47/06 , H01J47/18 , H01J
摘要： A method and apparatus for radiography and also a detector for detecting incident radiation. In the method and the apparatus X-rays (9) are emitted from an X-ray source (60). The X-rays which have interfered with an object to be imaged are detected (62) in a detector (64). The detector (64), which detects incident radiation includes a gaseous avalanche chamber, including electrode arrangements between which a voltage is applied for creating an electrical field, which causes electron-ion avalanches of primary and secondary ionization electrons released by incident radiation. The detector detects electrical signals in at least two detector electrode modules, the electrical signals being induced by electron-ion avalanches, in at least one of a plurality of detector electrode elements arranged adjacent to each other, each along a direction essentially parallel to the incident radiation, and where the at least two independent detector electrode modules are arranged along a direction essentially parallel to the incident radiation.

2. 发明专利

SE9901327D0 未知
公开(公告)号：SE9901327D0
公开(公告)日：1999-04-14
申请号：SE9901327
申请日：1999-04-14
申请人： DIGIRAY AB
发明人： FRANCKE TOM , PESKOV VLADIMIR , ULLBERG CHRISTER
IPC分类号： G01F1/66 , G01T1/18 , G01T20060101 , G01T1/185 , G01T1/29 , G01T7/00 , H01J47/02 , G01T
摘要： A detector for detection of ionizing radiation, and an apparatus for use in planar beam radiography, including such a detector. The detector includes a chamber filled with an ionizable gas. First and second electrode arrangements are provided in the chamber with a space therebetween. The space includes a conversion volume, an electron avalanche amplification unit arranged in the chamber, and at least one arrangement of read-out elements for detection of electron avalanches. To reduce the effect of possible spark discharges in the chamber, at least one of the first and second electrode arrangements includes a resistive material having a surface facing the other electrode arrangement.

3. 发明专利

SE513161C2 未知
公开(公告)号：SE513161C2
公开(公告)日：2000-07-17
申请号：SE9704015
申请日：1997-11-03
申请人： DIGIRAY AB
发明人： CARLSON PER , FRANCKE TOM , IVOTCHKINE VLADIMIR , VANIACHINE ALEXANDRE
IPC分类号： A61B6/00 , G01T1/185 , H05G1/64 , G01T1/28
摘要： A method and apparatus for radiography, and especially for planar beam radiography, and also a detector for detecting incident radiation. In the method and the apparatus, wherein X-rays are emitted from an X-ray source, the X-rays are formed into a planar beam and are transmitted through an object to be imaged, and the X-rays transmitted through said object are detected in a detector. The detector, which detects incident radiation is a gaseous parallel plate avalanche chamber, including electrode arrangements between which a voltage is applied for creating an electrical field, which causes electron-ion avalanches of primary and secondary ionization electrons released by incident radiation. The detector is oriented, in relation to the incident radiation, so that the radiation enters sideways between a first and a second parallel plate, between which the electrical field is created. Electrical signals induced by said electron-ion avalanches are detected in at least one detector electrode arrangement, including a plurality of detector electrode elements arranged adjacent to each other, each along a direction being essentially parallel to the incident radiation. Pulses from each detector electrode element are processed in processing electronics, for obtaining values for each pixel corresponding to the respective detector electrode element.

4. 发明专利

SE0000793D0 未知
公开(公告)号：SE0000793D0
公开(公告)日：2000-03-07
申请号：SE0000793
申请日：2000-03-07
申请人： DIGIRAY AB
发明人： FRANCKE TOM
IPC分类号： A61B6/03 , G01T1/185 , G01T1/29 , H01J47/02 , G01T

5. 发明专利

SE9901325D0 未知
公开(公告)号：SE9901325D0
公开(公告)日：1999-04-14
申请号：SE9901325
申请日：1999-04-14
申请人： DIGIRAY AB
发明人： FRANCKE TOM , PESKOV VLADIMIR
IPC分类号： G01T20060101 , G01T1/185 , H01J47/00 , H01J47/02 , G01T
摘要： A detector (64) for detection of ionizing radiation, an apparatus for use in planar beam radiography, comprising such a detector, and a method for detecting ionizing radiation. The detector comprises: a chamber filled with an ionizable gas; first and second electrode arrangements (2, 1, 18, 19) provided in said chamber with a space between them, said space including a conversion volume (13); means for electron avalanche amplification (17) arranged in said chamber; and, at least one arrangement of read-out elements (15) for detection of electron avalanches. A radiation entrance is provided so that radiation enters the conversion volume between the first and second electrode arrangements. In order to achieve well-defined avalanches the means for electron avalanche amplification includes a plurality of avalanche regions.

6. 发明专利

DE1029427T1 未知
公开(公告)号：DE1029427T1
公开(公告)日：2001-03-15
申请号：DE98950575
申请日：1998-10-19
申请人： DIGIRAY AB DANDERYD
发明人： CARLSON PER , IVOTCHKINE VLADIMIR , VANIACHINE ALEXANDRE , FRANCKE TOM
IPC分类号： A61B6/00 , G01T1/185 , H05G1/64 , G01T1/28
摘要： A method and apparatus for radiography, and especially for planar beam radiography, and also a detector for detecting incident radiation. In the method and the apparatus, wherein X-rays are emitted from an X-ray source, the X-rays are formed into a planar beam and are transmitted through an object to be imaged, and the X-rays transmitted through said object are detected in a detector. The detector, which detects incident radiation is a gaseous parallel plate avalanche chamber, including electrode arrangements between which a voltage is applied for creating an electrical field, which causes electron-ion avalanches of primary and secondary ionization electrons released by incident radiation. The detector is oriented, in relation to the incident radiation, so that the radiation enters sideways between a first and a second parallel plate, between which the electrical field is created. Electrical signals induced by said electron-ion avalanches are detected in at least one detector electrode arrangement, including a plurality of detector electrode elements arranged adjacent to each other, each along a direction being essentially parallel to the incident radiation. Pulses from each detector electrode element are processed in processing electronics, for obtaining values for each pixel corresponding to the respective detector electrode element.

7. 发明专利

SE0000438D0 未知
公开(公告)号：SE0000438D0
公开(公告)日：2000-02-11
申请号：SE0000438
申请日：2000-02-11
申请人： DIGIRAY AB
发明人： FRANCKE TOM , PESKOV VLADIMIR
IPC分类号： G01T20060101 , G01T1/185 , G01T

8. 发明专利

SE0000388D0 未知
公开(公告)号：SE0000388D0
公开(公告)日：2000-02-08
申请号：SE0000388
申请日：2000-02-08
申请人： DIGIRAY AB
发明人： FRANCKE TOM
IPC分类号： G01T20060101 , G01T1/185 , H01J47/02 , G01T

9. 发明专利

SE9901326D0 未知
公开(公告)号：SE9901326D0
公开(公告)日：1999-04-14
申请号：SE9901326
申请日：1999-04-14
申请人： DIGIRAY AB
发明人： FRANCKE TOM , PESKOV VLADIMIR
IPC分类号： G01T1/18 , G01T1/185 , G01T1/29 , G01T7/00 , G21K1/02 , H01J47/02 , G01T
摘要： A method for detecting ionizing radiation, a detector (64) for detection of ionizing radiation, and an apparatus for use in planar beam radiography, including the detector. The detector includes: a chamber filled with an ionizable gas; first and second electrode arrangements (2, 1, 18, 19) provided in the chamber with a space between them, the space including a conversion volume (13); an electron avalanche amplification unit (17) arranged in the chamber; and, at least one arrangement of read-out elements (15) for detection of electron avalanches. Radiation enters the conversion volume between the first and second electrode arrangements via a radiation entrance. The distance between the first and second electrode arrangements is selected to achieve discrimination of fluorescent photons and/or long-range electrons, in order to achieve improved position resolution.

10. 发明专利

CA2309097C A METHOD AND A DEVICE FOR PLANAR BEAM RADIOGRAPHY AND A RADIATION DETECTOR 未知
公开(公告)号：CA2309097C
公开(公告)日：2008-06-17
申请号：CA2309097
申请日：1998-10-19
申请人： DIGIRAY AB
发明人： FRANCKE TOM , CARLSON PER , IVOTCHKINE VLADIMIR , VANIACHINE ALEXANDRE
IPC分类号： G01T1/29 , A61B6/00 , G01T1/185 , H01J47/00 , H05G1/64
摘要： A method and apparatus for radiography, and especially for planar beam radiography, and also a detector for detecting incident radiation. In the method and apparatus, wherein X-rays (9) are emitted from an X-ray source (60), the X-rays are formed into a planar beam and are transmitted through an object to be imaged (62), and the X-rays transmitted through said object (62) are detected in a detector (64). The detector (64), which detects incident radiation is a gaseous parallel plate avalanche chamber, including electrode arrangements between which a voltage is applied for creating an electrical field, which causes electron-ion avalanches of primary and secondary ionization electrons released by incident radiation. The detector (64) is oriented, in relation to the incident radiation (9), so that the radiation enters sideways between a first and a second parallel plate, between which the electrical field is created. Electrical signals induced by said electron-ion avalanches are detected in at least one detector electrode arrangement, including a plurality of detector electrode elements arranged adjacent to each other, each along a direction being essentially parallel to the incident radiation. Pulses from each detector electrode element are processed in processing electronics, for obtainingvalues for each pixel corresponding to the respective detector electrode element.

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