GB2015816A - X-ray tubes - Google Patents

X-ray tubes

Info

Publication number
GB2015816A
GB2015816A GB7906526A GB7906526A GB2015816A GB 2015816 A GB2015816 A GB 2015816A GB 7906526 A GB7906526 A GB 7906526A GB 7906526 A GB7906526 A GB 7906526A GB 2015816 A GB2015816 A GB 2015816A
Authority
GB
United Kingdom
Prior art keywords
gun
pressure
coil system
cone
tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB7906526A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Original Assignee
EMI Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EMI Ltd filed Critical EMI Ltd
Priority to GB7906526A priority Critical patent/GB2015816A/en
Publication of GB2015816A publication Critical patent/GB2015816A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/16—Vessels; Containers; Shields associated therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
    • H01J35/147—Spot size control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/112—Non-rotating anodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/20—Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/24—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
    • H01J35/30—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof by deflection of the cathode ray
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/06—Cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/16—Vessels; Containers; Shields associated therewith
    • H01J35/18—Windows

Landscapes

  • Apparatus For Radiation Diagnosis (AREA)

Abstract

For CT examination a conical X-ray tube (half-, full or intermediate cone) having an anode in the form of a ring extending at least halfway around the body of the patient is used, the space charge dispersion being reduced by maintaining the pressure in the drift region higher than in the evacuated gun region. The arrangement is applied to tubes with long drift regions. The beam which is preferably ribbon shaped and may be formed by a stigmator with the lens/deflection coil system, may be rotated by a coil system (Fig 4 not shown) or by a rotating electron gun and may be continuously or step scanned. A gun is described (w.r.t. Fig 3 not shown). The pressure of for example nitrogen or inert gas may be maintained by a needle valve servo controlled by a pressure transducer. Dimensions and pressures are specified, oil enclosure 17 surrounds the gun, and the cone sides need not be straight. <IMAGE>
GB7906526A 1978-03-03 1979-02-23 X-ray tubes Withdrawn GB2015816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7906526A GB2015816A (en) 1978-03-03 1979-02-23 X-ray tubes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848478 1978-03-03
GB7906526A GB2015816A (en) 1978-03-03 1979-02-23 X-ray tubes

Publications (1)

Publication Number Publication Date
GB2015816A true GB2015816A (en) 1979-09-12

Family

ID=26242201

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7906526A Withdrawn GB2015816A (en) 1978-03-03 1979-02-23 X-ray tubes

Country Status (1)

Country Link
GB (1) GB2015816A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0107451A2 (en) * 1982-10-14 1984-05-02 Imatron Inc. Electron beam control assembly and method for a scanning electron beam computed tomography scanner
EP0117729A2 (en) * 1983-03-01 1984-09-05 Imatron Inc. Scanning electron beam computed tomography scanner with ion aided focusing
EP1213743A2 (en) * 1999-03-26 2002-06-12 Bede Scientific Instruments Limited Method and apparatus for prolonging the life of an x-ray target
DE102010012394A1 (en) * 2010-03-23 2011-09-29 Siemens Aktiengesellschaft X-ray tube for capturing image of female breast during tomosynthesis process, has vacuum housing, where electron beam emitted by cathode i.e. electron gun, provided in housing is moved by separated deflecting unit along anode assembly

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0107451A2 (en) * 1982-10-14 1984-05-02 Imatron Inc. Electron beam control assembly and method for a scanning electron beam computed tomography scanner
EP0107451A3 (en) * 1982-10-14 1986-03-19 Imatron Inc. Electron beam control assembly and method for a scanning electron beam computed tomography scanner
EP0117729A2 (en) * 1983-03-01 1984-09-05 Imatron Inc. Scanning electron beam computed tomography scanner with ion aided focusing
EP0117729A3 (en) * 1983-03-01 1986-03-19 Imatron Inc. Scanning electron beam computed tomography scanner with ion aided focusing
EP1213743A2 (en) * 1999-03-26 2002-06-12 Bede Scientific Instruments Limited Method and apparatus for prolonging the life of an x-ray target
EP1213743A3 (en) * 1999-03-26 2007-02-21 Bede Scientific Instruments Limited Method and apparatus for prolonging the life of an x-ray target
DE102010012394A1 (en) * 2010-03-23 2011-09-29 Siemens Aktiengesellschaft X-ray tube for capturing image of female breast during tomosynthesis process, has vacuum housing, where electron beam emitted by cathode i.e. electron gun, provided in housing is moved by separated deflecting unit along anode assembly

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)