US20090316855A1 - Control Means for Heat Load in X-Ray Scanning Apparatus - Google Patents

Control Means for Heat Load in X-Ray Scanning Apparatus Download PDF

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US20090316855A1
US20090316855A1 US12485897 US48589709A US20090316855A1 US 20090316855 A1 US20090316855 A1 US 20090316855A1 US 12485897 US12485897 US 12485897 US 48589709 A US48589709 A US 48589709A US 20090316855 A1 US20090316855 A1 US 20090316855A1
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source
ray
position
tube
positions
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US12485897
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Edward James Morton
Russell David Luggar
Paul De Antonis
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Edward James Morton
Russell David Luggar
Paul De Antonis
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03Computerised tomographs
    • A61B6/032Transmission computed tomography [CT]
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4007Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis characterised by using a plurality of source units
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4007Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis characterised by using a plurality of source units
    • A61B6/4014Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis characterised by using a plurality of source units arranged in multiple source-detector units
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00Investigating or analysing materials by the use of wave or particle radiation not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02Investigating or analysing materials by the use of wave or particle radiation not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04Investigating or analysing materials by the use of wave or particle radiation not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/046Investigating or analysing materials by the use of wave or particle radiation not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V5/00Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
    • G01V5/0008Detecting hidden objects, e.g. weapons, explosives
    • G01V5/0016Active interrogation, i.e. using an external radiation source, e.g. using pulsed, continuous or cosmic rays
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00X-ray tubes
    • H01J35/02Details
    • H01J35/04Electrodes mutual position thereof and constructional adaptations of the electrodes therefor
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00X-ray tubes
    • H01J35/02Details
    • H01J35/04Electrodes mutual position thereof and constructional adaptations of the electrodes therefor
    • H01J35/045Electrodes for controlling the current of the cathode ray, e.g. control grids
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00X-ray tubes
    • H01J35/24Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4021Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis involving movement of the focal spot
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00Investigating materials by wave or particle radiation
    • G01N2223/40Imaging
    • G01N2223/419Imaging computed tomograph

Abstract

The present invention is an X-ray scanning system having at least one multi-focus X-ray tubes spaced around an axis and arranged to emit X-rays through an object on the axis. The emitted X-rays are detected by sensors. Each multi-focus X-ray tube can emit X-rays from a plurality of source positions. In an exemplary scanning cycle, each of the source positions in each X-ray tube is used at least once and ordered to minimize the thermal load on the tubes.

Description

    CROSS-REFERENCE TO PRIOR APPLICATIONS
  • [0001]
    This application is a continuation of U.S. patent application Ser. No. 10/554,656 filed on Oct. 25, 2005 which is a 371 national stage application of PCT/GB04/01729 which was filed on and relies on for priority UK Patent Application No. 0309387, filed on Apr. 25, 2003.
  • [0002]
    The present invention relates to X-ray scanning in which X-rays are directed through an object from a number of positions around the object and the X-rays transmitted through the object are detected and used to build up an image of the object. This type of scanning is referred to as computed tomography (CT) scanning.
  • [0003]
    One method of CT scanning involves rotating an X-ray source around the object so that it directs X-rays through the object in different directions. Another method, for example as disclosed in U.S. Pat. No. 4,274,005, involves positioning a number of X-ray sources around the object and then operating the sources in turn so that the active source position scans round the object.
  • [0004]
    As the use of X-ray scanners, for example in security applications, increases, there is an increasing demand for scanners which operate quickly and which have a long lifetime.
  • [0005]
    Accordingly the present invention provides an X-ray imaging apparatus comprising X-ray production means arranged to produce X-rays from a plurality of source positions spaced around an object location and spaced from each other by a source spacing, a plurality of X-ray sensors arranged to be spaced around the object position so as to detect X-rays emitted from the source positions and passing through the object position, and control means arranged to control the order in which the source positions are active such that the average smallest displacement between an active source position in one emission period and an active source position in the subsequent period is greater than the source spacing.
  • [0006]
    This increase in average spacing between successively active source positions helps to spread the thermal load in the X-ray source.
  • [0007]
    Preferably said average smallest displacement is at least twice the source spacing. This can most easily be achieved by ensuring that the control means is arranged such that no active source position in any one emission period is adjacent a source position active in the next emission period.
  • [0008]
    The control means may arranged so that in each emission period only one source position is active.
  • [0009]
    Alternatively the control means may arrange such that in each emission period a plurality of source positions are active simultaneously. This can reduce the scanning time and increase the scanning rate.
  • [0010]
    Where the source positions are each arranged to produce X-rays which will be detected by a corresponding group of sensors, the control means is preferably arranged such that in each emission period, there is no overlap between the groups of sensors for said plurality of source positions. This ensures that the detected X-rays from each of the simultaneously active sources can be distinguished.
  • [0011]
    Preferably in each emission period at least half of the sensors are arranged to receive X-rays from the active source positions. More preferably in each emission period substantially all of the sensors are arranged to receive X-rays from the active source positions.
  • [0012]
    Preferably the apparatus comprises a plurality of X-ray tubes each providing a plurality of said source positions.
  • [0013]
    In this case the control means is preferably arranged such that in each emission period the active source position is in a different tube from the active source position in the previous emission period.
  • [0014]
    Conveniently only one source position is active in each emission period and the active source positions are provided in each of the tubes in turn.
  • [0015]
    Preferably, within each tube, the order in which the source positions are active is arranged such that in each emission period the active source position is non-adjacent to the source position active in the previous emission period.
  • [0016]
    Preferred embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which:
  • [0017]
    FIG. 1 shows an X-ray emitter suitable for use with the invention,
  • [0018]
    FIG. 2 is a diagram of an X-ray imaging system according to the invention including a number of emitter units as shown in FIG. 1;
  • [0019]
    FIG. 3 is a diagram of the layout of an X-ray imaging system according to a second embodiment of the invention; and
  • [0020]
    FIG. 4 is a diagram of the layout of an X-ray imaging system according to a third embodiment of the invention.
  • [0021]
    Referring to FIG. 1, a multi-focus X-ray tube 10 comprises a ceramic former 12 and an emitter element 18 extending along between the sides 14, 16 of the former. A number of grid elements in the form of grid wires 20 are supported on the former 12 and extend over the gap between its two sides 14, 16 perpendicular to the emitter element 18, but in a plane which is parallel to it. A number of focusing elements in the form of focusing wires 22 are supported in another plane on the opposite side of the grid wires to the emitter element. The focusing wires 22 are parallel to the grid wires 20 and spaced apart from each other with the same spacing as the grid wires, each focusing wire 22 being aligned with a respective one of the grid wires 20.
  • [0022]
    The source 10 is enclosed in a housing 24 of an emitter unit 25 with the former 12 being supported on the base 24 a of the housing. The focusing wires 22 are supported on two support rails 26 a, 26 b which extend parallel to the emitter element 18, and are spaced from the former 12, the support rails being mounted on the base 24 a of the housing. The support rails 26 a, 26 b are electrically conducting so that all of the focusing wires 22 are electrically connected together. One of the support rails 26 a is connected to a connector 28 which projects through the base 24 a of the housing to provide an electrical connection for the focusing wires 22. Each of the grid wires 20 extends down one side 16 of the former and is connected to a respective electrical connector 30 which provide separate electrical connections for each of the grid wires 20.
  • [0023]
    An anode 32 is supported between the side walls 24 b, 24 c of the housing. The anode extends parallel to the emitter element 18. The grid and focusing wires 20, 22 therefore extend between the emitter element 18 and the anode 32. An electrical connector 34 to the anode extends through the side wall 24 b of the housing.
  • [0024]
    The emitter element 18 is supported in the ends of the former and is heated by means of an electric current supplied to it via further connectors 36, 38 in the housing.
  • [0025]
    In order to produce a beam of electrons from one position, a pair of adjacent grid wires 20 can be connected to an extracting potential which is positive with respect to the element 18 while the remaining grid wires are connected to a blocking potential which is negative with respect to the element 18. By selecting which pair of wires 20 is used to extract electrons, the position of the beam of electrons can be chosen. As the X-rays will be emitted from the anode 32 at a point where the electrons strike it, the position of the X-ray source can also be chosen by choosing the extracting pair of grid wires. The focusing elements 22 are all kept at a positive potential with respect to the grid wires 20 so that electrons extracted between any pair of the grid wires will also pass between, and be focussed by, a corresponding pair of focusing elements 22.
  • [0026]
    Referring to FIG. 2, an X-ray scanner 50 is set up in a conventional geometry and comprises an array of emitter units 25 arranged in an arc around a central scanner axis X, and orientated so as to emit X-rays towards the scanner axis X. A ring of sensors 52 is placed inside the emitters, directed inwards towards the scanner axis. The sensors 52 and emitter units 25 are offset from each other along the axis X so that X-rays emitted from the emitter units pass by the sensors nearest to them, through the object, and are detected by a number of sensors furthest from them. The number of sensors 52 that will detect X-rays from each source depends on the width of the fan of X-rays that is emitted from each source position in the tubes 25. The scanner is controlled by a control system which operates a number of functions represented by functional blocks in FIG. 5. A system control block 54 controls, and receives data from, an image display unit 56, an X-ray tube control block 58 and an image reconstruction block 60. The X-ray tube control block 58 controls a focus control block 62 which controls the potentials of the focus wires 22 in each of the emitter units 25, a grid control block 64 which controls the potential of the individual grid wires 20 in each emitter unit 25, and a high voltage supply 68 which provides the power to the anode 32 of each of the emitter blocks and the power to the emitter elements 18. The image reconstruction block 60 controls and receives data from a sensor control block 70 which in turn controls and receives data from the sensors 52.
  • [0027]
    In operation, an object to be scanned is passed along the axis X, and X-ray beams are directed through the object from the X-ray tubes 25. In each scanning cycle each source position in each tube 25 is used once, the scanning cycle being repeated as the object moves along the axis X. Each source position produces a fan of X-rays which after passing through the object are detected by a number of the sensors 52. However, the order in which the tubes and the positions within the tubes are used is controlled as will now be described.
  • [0028]
    The order of X-ray emission from the source positions in the tubes 25 is chosen so as to minimize the thermal load on the X-ray tube. This is achieved by ordering the emissions so that each source position is non-adjacent to, and therefore spaced from, the previous one and the subsequent one. This ordering applies both to the source positions within each tube 25, and also to the tubes themselves. Therefore each source position is in a different tube to the previous one and the next one. In fact the best distribution of thermal load is achieved if the source position cycles through all of the tubes, using one position from each tube, and then cycles through the tubes again using a different source position within each tube. The cycling is then repeated until all of the source positions in all of the tubes have been used once. This completes one scanning cycle which can then be repeated.
  • [0029]
    Within each tube the source positions are taken in an order which spreads the thermal load within the tube. This is achieved by ordering the source positions so that the distance between each source position and the next one in that tube, and the previous one in that tube, are both maximized. Firstly, therefore, if the number of source positions per tube allows it, each source position in the tube should be non-adjacent to the next and previous ones in that tube. Then, depending on the number of source positions, the ordering is chosen so as to distribute the thermal load as much as possible.
  • [0030]
    For example, if as in a second embodiment of the invention shown in FIG. 3, there are five X-ray tubes 60, 61, 62, 63, 64 numbered in the order in which they are positioned 1, 2, 3, 4 and 5, and each one can produce X-rays from 5 source positions 70, 71, 72, 73, also numbered in order along the tube 60 as 1, 2, 3, 4 and 5, then best ordering for the source positions within each tube is 1, 3, 5, 2, 4. The same sequence is also used for ordering the tubes so as to maximize the angular separation between successive emissions. This produces an emission ordering as follows, where the source positions are numbered in order round the object 75 starting at the left hand end of the tube 60 at the left end of the row and counting to the right hand end of the tube 64 at the right end of the row.
  • [0000]
    Source Position Overall Source
    Tube in Tube position
    1 1 1
    3 1 11
    5 1 21
    2 1 6
    4 1 16
    1 3 3
    3 3 13
    5 3 23
    2 3 8
    4 3 18
    1 5 5
    3 5 15
    5 5 25
    2 5 10
    4 5 20
    1 2 2
    3 2 12
    5 2 22
    2 2 7
    4 2 17
    1 4 4
    3 4 14
    5 4 24
    2 4 9
    4 4 19
  • [0031]
    The same ordering could also be used with, for example, 25 source positions in a single tube which is shaped around the object 75.
  • [0032]
    It will be appreciated that, for X-ray tubes with less than 5 source positions it is not possible to avoid using adjacent positions in subsequent emissions. However, for tubes with 5 or more source positions, this can be avoided.
  • [0033]
    Referring to FIG. 4, in a third embodiment of the invention a plurality of X-ray sources 80 are spaced around an axis X, with a plurality of sensors 82 axially offset from the sources 80 as in the first embodiment. When one of the sources 80a emits an X-ray beam 84 this diverges, passes through the object 86 and reaches a number of the sensors 82. The number of sensors 82 which will detect X-rays from each of the sources depends on the width of the beam of X-rays, which is a known quantity for any give system, and can be quantified in terms of a half-angle. This is the angle between the centre of the beam and the edge of the beam.
  • [0034]
    When the sensors 82 which are needed to detect X-rays from each of the source positions 80 are known, source positions can be selected which can emit simultaneously, provided that they do not require any common detectors. For example if there are 24 source positions 80 and 24 sensors 82 and each source position requires 5 sensors, then four of the sensors 80 a, 80 b, 80 c, 80 d, spaced around the object at 90° intervals can be used simultaneously.
  • [0035]
    In practice the number of source positions and sensors is likely to be higher than this. To satisfy the Nyquist sampling theorem, it is necessary to match the number of source positions Nφ to the number of sensors Ns of width d that are required to cover the linear dimension of the object Nsd. This leads to the result
  • [0000]

    N φ =πN s/2.
  • [0036]
    For example an image where Ns=64 will require Nφ=100 sampling points to satisfy the Nyquist sampling criterion.
  • [0037]
    It will be appreciated that the ordering of the emission positions can be varied in a large number of ways for any given number of emission positions, and that the optimum ordering will also vary depending on the number of emission positions and the number of X-ray tubes.

Claims (16)

  1. 1-13. (canceled)
  2. 14. An X-ray imaging apparatus comprising:
    at least one X-ray tube comprising a first X-ray source and a second X-ray source, wherein each of said first and second X-ray sources produce X-rays and wherein the first X-ray source and the second X-ray source are adjacent each other and spaced from each other by a first spacing;
    at least one X-ray sensor to detect X-rays emitted from the at least one X-ray tube; and
    a controller for activating said first X-ray source when said second X-ray source is inactive and for activating said second X-ray source when said first X-ray source is inactive.
  3. 15. The X-ray imaging apparatus of claim 1 wherein said X-ray tube comprises a third X-ray source and wherein said third X-ray source is spaced from said first X-ray source by a second spacing.
  4. 16. The X-ray imaging apparatus of claim 15 wherein said second spacing is greater than said first spacing.
  5. 17. The X-ray imaging apparatus of claim 16 wherein said controller first activates said first X-ray source while keeping inactive the second X-ray source and the third X-ray source.
  6. 18. The X-ray imaging apparatus of claim 17 wherein said controller activates said third X-ray source, while keeping inactive the first and second X-ray sources, immediately after inactivating said first X-ray source.
  7. 19. The X-ray imaging apparatus of claim 14 further comprising a second X-ray tube comprising a first X-ray source and a second X-ray source, wherein each of said first and second X-ray sources produce X-rays and wherein the first X-ray source and the second X-ray source are adjacent each other and spaced from each other by a spacing;
  8. 20. The X-ray imaging apparatus of claim 19 wherein the controller immediately activates the first X-ray source in the second X-ray tube after inactivating the first X-ray source in the at least one X-ray tube and before activating the second X-ray source in the at least one X-ray tube.
  9. 21. An X-ray imaging apparatus comprising
    a first X-ray tube comprising a first plurality of source positions, including a first source position and a second source position, wherein the first source position and the second source position are adjacent each other and spaced from each other by a first source spacing;
    a second X-ray tube comprising a second plurality of source positions, including a third source position and a fourth source position, wherein the third source position and the fourth source position are adjacent each other and spaced from each other by a second source spacing;
    at least one X-ray sensor to detect X-rays emitted from the first or second X-ray tubes; and
    a controller for controlling an order in which the first, second, third, and fourth source positions are active such that a displacement between an active source position in one emission period and an active source position in a period immediately after the emission period is greater than an amount related to said first and second source spacing.
  10. 22. The imaging apparatus of claim 21 wherein said displacement is at least twice the first source spacing.
  11. 23. The imaging apparatus of claim 21 wherein said displacement is at least twice the second source spacing.
  12. 24. The imaging apparatus of claim 21 wherein an active source position in the emission period is not adjacent a source position that is active in the period immediately after the emission period.
  13. 25. The imaging apparatus of claim 21 wherein only one of the first, second, third or fourth source position in an X-ray tube is active in each emission period.
  14. 26. The imaging apparatus of claim 21 wherein one source in said first X-ray tube and one source in said second X-ray tube are active simultaneously in each emission period.
  15. 27. The imaging apparatus of claim 21 wherein, in each emission period, more than one source position is active and each of said active source positions is located in a different X-ray tube.
  16. 28. The imaging apparatus of claim 21 wherein only one source position in each X-ray tube is active in each emission period and each X-ray tube is active in a sequential order.
US12485897 2003-04-25 2009-06-16 Control Means for Heat Load in X-Ray Scanning Apparatus Abandoned US20090316855A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB0309387A GB0309387D0 (en) 2003-04-25 2003-04-25 X-Ray scanning
GB0309387 2003-04-25
PCT/GB2004/001729 WO2004097386A8 (en) 2003-04-25 2004-04-23 Control means for heat load in x-ray scanning apparatus
US55465607 true 2007-03-29 2007-03-29
US12485897 US20090316855A1 (en) 2003-04-25 2009-06-16 Control Means for Heat Load in X-Ray Scanning Apparatus

Applications Claiming Priority (23)

Application Number Priority Date Filing Date Title
US12485897 US20090316855A1 (en) 2003-04-25 2009-06-16 Control Means for Heat Load in X-Ray Scanning Apparatus
US12712476 US8243876B2 (en) 2003-04-25 2010-02-25 X-ray scanners
US12787878 US8804899B2 (en) 2003-04-25 2010-05-26 Imaging, data acquisition, data transmission, and data distribution methods and systems for high data rate tomographic X-ray scanners
US12787930 US8223919B2 (en) 2003-04-25 2010-05-26 X-ray tomographic inspection systems for the identification of specific target items
US12788083 US8451974B2 (en) 2003-04-25 2010-05-26 X-ray tomographic inspection system for the identification of specific target items
US12792931 US8331535B2 (en) 2003-04-25 2010-06-03 Graphite backscattered electron shield for use in an X-ray tube
US12835682 US8204173B2 (en) 2003-04-25 2010-07-13 System and method for image reconstruction by using multi-sheet surface rebinning
US13032593 US9113839B2 (en) 2003-04-25 2011-02-22 X-ray inspection system and method
US13346705 US8559592B2 (en) 2003-04-25 2012-01-09 System and method for image reconstruction by using multi-sheet surface rebinning
US13532862 US20130251098A1 (en) 2003-04-25 2012-06-26 X-Ray Tomographic Inspection Systems for the Identification of Specific Target Items
US13548873 US9020095B2 (en) 2003-04-25 2012-07-13 X-ray scanners
US13674086 US9208988B2 (en) 2005-10-25 2012-11-11 Graphite backscattered electron shield for use in an X-ray tube
US13870407 US8885794B2 (en) 2003-04-25 2013-04-25 X-ray tomographic inspection system for the identification of specific target items
US14312540 US9183647B2 (en) 2003-04-25 2014-06-23 Imaging, data acquisition, data transmission, and data distribution methods and systems for high data rate tomographic X-ray scanners
US14508464 US9158030B2 (en) 2003-04-25 2014-10-07 X-ray tomographic inspection system for the identification of specific target items
US14641777 US9618648B2 (en) 2003-04-25 2015-03-09 X-ray scanners
US14688898 US9726619B2 (en) 2005-10-25 2015-04-16 Optimization of the source firing pattern for X-ray scanning systems
US14798195 US9442082B2 (en) 2003-04-25 2015-07-13 X-ray inspection system and method
US14848176 US9606259B2 (en) 2003-04-25 2015-09-08 X-ray tomographic inspection system for the identification of specific target items
US14848590 US9747705B2 (en) 2003-04-25 2015-09-09 Imaging, data acquisition, data transmission, and data distribution methods and systems for high data rate tomographic X-ray scanners
US14930293 US9576766B2 (en) 2003-04-25 2015-11-02 Graphite backscattered electron shield for use in an X-ray tube
US15437033 US20180038988A1 (en) 2003-04-25 2017-02-20 X-ray Tomographic Inspection System for the Identification of Specific Target Items
US15439837 US20170299763A1 (en) 2003-04-25 2017-02-22 X-Ray Scanners

Related Parent Applications (10)

Application Number Title Priority Date Filing Date
US10554656 Continuation
US10554656 Continuation US7564939B2 (en) 2003-04-25 2004-04-23 Control means for heat load in X-ray scanning apparatus
PCT/GB2004/001729 Continuation WO2004097386A8 (en) 2003-04-25 2004-04-23 Control means for heat load in x-ray scanning apparatus
US55465607 Continuation 2007-03-29 2007-03-29
US12712476 Continuation US8243876B2 (en) 2003-04-25 2010-02-25 X-ray scanners
US12788083 Continuation US8451974B2 (en) 2003-04-25 2010-05-26 X-ray tomographic inspection system for the identification of specific target items
US12787930 Continuation US8223919B2 (en) 2003-04-25 2010-05-26 X-ray tomographic inspection systems for the identification of specific target items
US12787878 Continuation US8804899B2 (en) 2003-04-25 2010-05-26 Imaging, data acquisition, data transmission, and data distribution methods and systems for high data rate tomographic X-ray scanners
US12792931 Continuation US8331535B2 (en) 2003-04-25 2010-06-03 Graphite backscattered electron shield for use in an X-ray tube
US12835682 Continuation US8204173B2 (en) 2003-04-25 2010-07-13 System and method for image reconstruction by using multi-sheet surface rebinning

Related Child Applications (8)

Application Number Title Priority Date Filing Date
US55465607 Continuation-In-Part 2007-03-29 2007-03-29
US12697073 Continuation-In-Part US8085897B2 (en) 2003-04-25 2010-01-29 X-ray scanning system
US12712476 Continuation-In-Part US8243876B2 (en) 2003-04-25 2010-02-25 X-ray scanners
US12787930 Continuation-In-Part US8223919B2 (en) 2003-04-25 2010-05-26 X-ray tomographic inspection systems for the identification of specific target items
US12788083 Continuation-In-Part US8451974B2 (en) 2003-04-25 2010-05-26 X-ray tomographic inspection system for the identification of specific target items
US12787878 Continuation-In-Part US8804899B2 (en) 2003-04-25 2010-05-26 Imaging, data acquisition, data transmission, and data distribution methods and systems for high data rate tomographic X-ray scanners
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