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    LINEAR ACCELERATOR
    3.
    发明公开
    LINEAR ACCELERATOR 有权
    线性加速器

    公开(公告)号：EP1203514A1

    公开(公告)日：2002-05-08

    申请号：EP00949794.2

    申请日：2000-08-03

    申请人： Elekta AB (publ)

    发明人： ALLEN, John ,  BRUNDLE, Leonard Knowles ,  LARGE, Terry Arthur ,  BATES, Terence

    IPC分类号： H05H7/18 ,  H05H9/04

    CPC分类号： H05H9/04 ,  H05H7/18

    摘要： An accelerator comprises a plurality of accelerating cells arranged to convey a beam, adjacent cells being linked by a coupling cell, the coupling cells being arranged to dictate the ratio of electric field in the respective adjacent accelerating cells, at least one coupling cell being switchable between a positive ratio and a negative ratio. Such an accelerator in effect inserts a phase change into the E field by imposing a negative ratio, meaning that the beam will meet a reversed electric field in subsequent cells and will in fact be decelerated. As a result, the beam can be developed and bunched in early cells while accelerating to and/or at relativistic energies, and then bled of energy in later cells to bring the beam energy down to (say) between 100 and 300 KeV. Energies of this magnitude are comparable to diagnostic X-rays, where much higher contrast of bony structures exists. Hence the accelerator can be used to take kilovoltage portal images. A suitable structure for the switchable coupling cell comprises a cavity containing a conductive element rotatable about an axis transverse to the beam axis, as for example set out in our earlier application PCT/GB99/00187. The application also relates to the use of such an accelerator and an operating method for such an accelerator.

    摘要翻译： 加速器包括布置成传送波束的多个加速单元，由耦合单元链接的相邻单元，耦合单元布置成指示各个相邻加速单元中的电场比率，至少一个耦合单元可在 正比率和负比率。 这种加速器实际上通过施加负比例而将相变插入到E场中，这意味着光束将在随后的单元中遇到反向电场并且实际上将被减速。 结果，光束可以在早期细胞中发育并聚集，同时加速到和/或在相对论能量上，然后在后面的细胞中释放能量，使光束能量降低到100-300KeV之间（比如说）。 这个量级的能量与诊断X射线相当，其中存在更高的骨结构对比度。 因此，加速器可用于拍摄千伏门户图像。 用于可切换耦合单元的合适结构包括腔室，该腔室包含可围绕横向于光束轴线的轴线旋转的导电元件，例如在我们先前的申请PCT / GB99 / 00187中提出的。 本申请还涉及这种加速器的使用和这种加速器的操作方法。

    PORTAL IMAGING DURING RADIOTHERAPY
    7.
    发明公开
    PORTAL IMAGING DURING RADIOTHERAPY 审中-公开
    放射治疗期间的门静脉造影

    公开(公告)号：EP3300770A1

    公开(公告)日：2018-04-04

    申请号：EP17197721.8

    申请日：2015-09-01

    申请人： Elekta AB (PUBL)

    发明人： ALLEN, John ,  WINFIELD, Colin

    IPC分类号： A61N5/10 ,  A61B6/00

    CPC分类号： A61N5/1049 ,  A61B6/032 ,  A61N5/1036 ,  A61N5/1047 ,  A61N5/107 ,  A61N5/1081 ,  A61N5/1083 ,  A61N2005/1054 ,  A61N2005/1074

    摘要： A radiotherapy apparatus comprises a source for producing a beam of ionising radiation along an axis, the beam covering a maximum aperture of the source, a collimator for collimating the beam to produce a collimated beam covering a sub-part of the maximum aperture, a patient support positioned in the path of the beam, a rotatable gantry, on which the source is mounted, for rotating the source around the patient support thereby to deliver the beam from a range of directions, an imaging device located opposite the source and with the patient support between the source and the imaging device, and mounted on the gantry via a drive member allowing translational motion of the imaging device in at least one direction perpendicular to the axis, and a control unit adapted to control the drive member to move the imaging device within the maximum aperture and maintain coincidence between the imaging device and the sub-part of the maximum aperture. Accordingly, the EPID can be moved during the treatment in order to maintain the collimated field of the radiation beam within the bounds of the EPID. This ensures that the image is valid and prevents damage to the EPID as a result of exposure of more sensitive (or less shielded) parts to the beam.

    摘要翻译： 一种放射治疗设备包括：用于沿着轴线产生电离辐射束的源，所述束覆盖所述源的最大孔径;准直器，用于准直所述束以产生覆盖所述最大孔径的子部分的准直束，患者 位于光束路径上的支架，安装有光源的可旋转机架，用于围绕患者支架旋转光源，从而从一定范围的方向传送光束;位于光源对面并与患者相对的成像装置 支撑在所述源和所述成像装置之间，并且经由允许所述成像装置在垂直于所述轴的至少一个方向上平移的驱动构件安装在所述机架上;以及控制单元，适于控制所述驱动构件以将所述成像装置 在最大光圈内并保持成像装置和最大光圈的子部分之间的重合。 因此，可以在治疗期间移动EPID以便将辐射束的准直场维持在EPID的范围内。 这确保了图像的有效性并防止由于对光束较敏感（或较少屏蔽）部件的曝光而损坏EPID。

    LINEAR ACCELERATOR
    8.
    发明公开
    LINEAR ACCELERATOR 有权
    直线加速器

    公开(公告)号：EP2687067A2

    公开(公告)日：2014-01-22

    申请号：EP12731293.2

    申请日：2012-03-13

    申请人： Elekta AB (PUBL)

    发明人： ALLEN, John ,  LARGE, Terry Arthur

    IPC分类号： H05H7/18 ,  H05H7/22 ,  H05H9/04

    CPC分类号： H05H9/048 ,  H05H7/18 ,  H05H7/22 ,  H05H2007/225

    摘要： The present invention provides a linear accelerator in which a rotatable conductive vane is employed to vary the electromagnetic coupling between adjacent accelerating cells. The vane is sealed off from the rest of the linear accelerator by an insulating partition, so the pressure around the vane can be higher than in the rest of the accelerator. This greatly simplifies the mechanisms which may be used to control the rotation of the vane, allowing a higher bakeout temperature in manufacture and a higher rate of rotation in use.

    IMAGING SYSTEMS FOR IONISING RADIATION
    10.
    发明公开
    IMAGING SYSTEMS FOR IONISING RADIATION 有权
    成像系统，电离辐射

    公开(公告)号：EP2061557A1

    公开(公告)日：2009-05-27

    申请号：EP06792024.9

    申请日：2006-09-13

    申请人： Elekta AB (publ)

    发明人： LONG, Andrew ,  BROWN, Kevin ,  ALLEN, John

    IPC分类号： A61N5/00

    CPC分类号： A61N5/1049 ,  A61B6/032 ,  A61B6/4488 ,  A61N2005/1054

    摘要： Flat panel images obtained during concurrent radiotherapy typically suffer from artefacts that relate to the pulses of MV energy. For a radiotherapeutic apparatus comprising a pulsed source of therapeutic radiation, a detector comprising control circuitry, an array of pixel elements, each having a signal output and an 'enable' input and being arranged to release a signal via the signal output upon being triggered by the enable input, and an interpreter arranged to receive the signal outputs of the pixel elements, the interpreter having a reset control, there are advantages in the control circuitry being adapted to reset the interpreter after a pulse of therapeutic radiation, prior to enabling at least one pixel of the array. Alternatively, the control circuitry can prompt a plurality of pulses by the pulsed source and then enable a plurality of pixels of the array. In effect, the therapeutic pulses are grouped into a short flurry of pulses. It is therefore preferred that the plurality of pixels comprises substantially all the pixels of the array.