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    RADIOTHERAPY APPARATUS
    2.
    发明公开
    RADIOTHERAPY APPARATUS 有权
    放射治疗设备

    公开(公告)号：EP2321009A1

    公开(公告)日：2011-05-18

    申请号：EP09746070.3

    申请日：2009-05-15

    申请人： Elekta AB (PUBL) ,  The Institute of Cancer Research

    发明人： BROWN, Kevin ,  THOMPSON, Maria, Giulia ,  ROBERTS, David, Anthony ,  EVANS, Philip, Mark ,  HANSEN, Vibeke, Nordmark

    IPC分类号： A61N5/10 ,  A61B6/00 ,  A61B6/02

    CPC分类号： A61N5/1049 ,  A61B6/06 ,  A61B6/4042 ,  A61B6/583 ,  A61N2005/1061 ,  G21K1/02 ,  G21K1/10 ,  H01J35/08 ,  H01J2235/081 ,  H01J2235/087

    摘要： It is desirable to achieve a co-incident investigative kV source for a therapeutic MV source - a so-called "beams-eye-view" source. It has been suggested that bremsstrahlung radiation from an electron window be employed; we propose a practical structure for achieving this which can switch easily between a therapeutic beam and a beam-eye-view diagnostic beam capable of offering good image resolution. Such a radiation source comprises an electron gun, a pair of targets locateable in the path of a beam produced by the electron gun, one target of the pair being of a material with a lower atomic number than the other, and an electron absorber insertable into and withdrawable from the path of the beam. In a preferred form, the electron gun is within a vacuum chamber, and the pair of targets are located at a boundary of the vacuum chamber. The lower atomic number target can be Nickel and the higher atomic number target Copper and/or Tungsten. The electron absorber can be Carbon, and can be located within the primary collimator, or within one of a plurality of primary collimators interchangeably locateable in the path of the beam. Such a radiation source can be included within a radiotherapy apparatus, to which the present invention further relates. A flat panel imaging device for this source can be optimised for low energy x-rays rather than high energy; Caesium Iodide-based panels are therefore suitable.

    X-RAY APPARATUS
    4.
    发明授权
    X-RAY APPARATUS 有权
    X射线设备

    公开(公告)号：EP2229805B1

    公开(公告)日：2011-10-12

    申请号：EP07857056.1

    申请日：2007-12-21

    申请人： Elekta AB (PUBL) ,  The Institute of Cancer Research

    发明人： BROWN, Kevin, John ,  THOMPSON, Maria, Giulia ,  ROBERTS, David, Anthony ,  EVANS, Philip, Mark ,  HANSEN, Vibeke, Nordmark

    IPC分类号： H05H9/04

    CPC分类号： H05H7/12 ,  H01J35/00 ,  H01J2235/08 ,  H05H6/00 ,  H05H9/04

    摘要： X-ray apparatus comprises a linear accelerator adapted to produce a beam of electrons at one of at least two selectable energies and being controlled to change the selected energy on a periodic basis, and a target to which the beam is directed thereby to produce a beam of x-radiation, the target being non- homogenous and being driven to move periodically in synchrony with the change of the selected energy. In this way, the target can move so that a different part is exposed to the electron beam when different pulses arrive. This enables the appropriate target material to be employed depending on the selected energy. The easiest form of periodic movement for the target is likely to be a rotational movement. The target can be immersed in a coolant fluid such as water. The linear accelerator can be of the type disclosed in WO2006/097697A1. The target preferably contains at least one exposed area of tungsten and/or at least one exposed area of carbon. These can be present as inhomogeneities in the material of which the target is composed, such as Carbon inserts in a Tungsten substrate (or vice versa), alternating segments of Carbon and Tungsten, Carbon and Tungsten inserts in a substrate of a third material, or arrangements involving other materials in addition to or instead of Carbon and/or Tungsten. Alternatively, the target can be of a homogenous material but have inhomogeneities in its thickness to cater for the different electron energies. The same concept can be applied to the filter. A detector can be provided, operating in synchrony with the energy variation. Such an x-ray apparatus can form a part of a radiotherapy apparatus, in which case the first selected energy can be a diagnostic energy and a second selected energy a therapeutic energy.

    X-RAY APPARATUS
    5.
    发明公开
    X-RAY APPARATUS 有权
    X射线设备

    公开(公告)号：EP2229805A1

    公开(公告)日：2010-09-22

    申请号：EP07857056.1

    申请日：2007-12-21

    申请人： Elekta AB (PUBL) ,  The Institute of Cancer Research

    发明人： BROWN, Kevin, John ,  THOMPSON, Maria, Giulia ,  ROBERTS, David, Anthony ,  EVANS, Philip, Mark ,  HANSEN, Vibeke, Nordmark

    IPC分类号： H05H9/04

    CPC分类号： H05H7/12 ,  H01J35/00 ,  H01J2235/08 ,  H05H6/00 ,  H05H9/04

    摘要： X-ray apparatus comprises a linear accelerator adapted to produce a beam of electrons at one of at least two selectable energies and being controlled to change the selected energy on a periodic basis, and a target to which the beam is directed thereby to produce a beam of x-radiation, the target being non- homogenous and being driven to move periodically in synchrony with the change of the selected energy. In this way, the target can move so that a different part is exposed to the electron beam when different pulses arrive. This enables the appropriate target material to be employed depending on the selected energy. The easiest form of periodic movement for the target is likely to be a rotational movement. The target can be immersed in a coolant fluid such as water. The linear accelerator can be of the type disclosed in WO2006/097697A1. The target preferably contains at least one exposed area of tungsten and/or at least one exposed area of carbon. These can be present as inhomogeneities in the material of which the target is composed, such as Carbon inserts in a Tungsten substrate (or vice versa), alternating segments of Carbon and Tungsten, Carbon and Tungsten inserts in a substrate of a third material, or arrangements involving other materials in addition to or instead of Carbon and/or Tungsten. Alternatively, the target can be of a homogenous material but have inhomogeneities in its thickness to cater for the different electron energies. The same concept can be applied to the filter. A detector can be provided, operating in synchrony with the energy variation. Such an x-ray apparatus can form a part of a radiotherapy apparatus, in which case the first selected energy can be a diagnostic energy and a second selected energy a therapeutic energy.