公开(公告)号：EP1803341B1

公开(公告)日：2012-02-29

申请号：EP05786155.1

申请日：2005-09-08

申请人： Elekta AB (publ) ,  ETS-Lindgren Euroshield OY

发明人： SIMOLA, Juha ,  LAINE, Petteri ,  RAKKOLAINEN, Heikki

IPC分类号： H05K9/00

CPC分类号： H05K9/0003 ,  E04B2001/925 ,  Y10T403/17 ,  Y10T403/46

摘要： The present invention discloses a joint structure between the wall elements of a light-weight magnetically shielded room. In the joint structure, the end of the aluminium plate of the element is stepped and its surface roughened. In addition to this, the aluminium plate is coated, for example, with tin to improve the electrical contact. The joint includes µ metal plates which are used to make a magnetic contact between the µ metal plates of the elements. The compression force achieved by means of bolts is transmitted to the joint by means of an aluminium moulding. The non-continuous compression force is balanced over the entire joint area by using presser rubbers. The joint structure is protected by means of supporting profiles which are used to electrically couple the thinner aluminium plate of the sandwich type wall element to the thinner aluminium plate of an adjacent element. The thinner aluminium plate and the supporting profile can also be coated, for example, with tin to improve the contact.

公开(公告)号：EP2326390A1

公开(公告)日：2011-06-01

申请号：EP09784773.5

申请日：2009-07-24

申请人： Elekta AB (publ)

发明人： JAFFRAY, David, A. ,  BROWN, Kevin, John ,  BOOTSMA, Gregory ,  RUSCHIN, Mark ,  CARLSSON, Per

IPC分类号： A61N5/10

CPC分类号： A61N5/1084 ,  A61N5/1065 ,  A61N2005/1059 ,  A61N2005/1061 ,  A61N2005/1063 ,  A61N2005/1097

摘要： A highly compact, high-performance volumetric imaging system is proposed, that is integrated with a multi-source Cobalt-60 gamma irradiator for high throughput, high accuracy and minimally invasive fractioned treatments of intracranial, orbital and head-and-neck targets.

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.

公开(公告)号：EP2225001A1

公开(公告)日：2010-09-08

申请号：EP07819444.6

申请日：2007-10-30

申请人： Elekta AB (PUBL)

发明人： BROWN, Kevin ,  STREAMER, Ralph ,  BOURNE, Duncan

IPC分类号： A61N5/10

CPC分类号： A61N5/1049 ,  A61N5/1042 ,  A61N5/1067 ,  A61N2005/1061

摘要： Realtime beam shape adjustment in response to (for example) online CT scanning of a patient during treatment is assisted by the radiotherapy apparatus comprising a source adapted to emit a beam of therapeutic radiation, a collimator for delimiting the radiation beam, the collimator comprising a plurality of leaves arranged alongside each other and be moveable longitudinally so that the tips of the leaves define a variable edge of the collimator, the leaves being mounted on a support that is moveable laterally with respect to the leaves. In this way, movements of the tumour that are perpendicular to the direction of leaf motion can be accommodated by simply moving the collimator bodily so as to accommodate this. It is preferred that the apparatus also includes a control means adapted to receive information as to the location of the target volume, and, on the basis of that information, control the longitudinal positions of the leaves and the lateral position of the support. It is also preferred that the support tilts as it moves laterally along a path. This can be achieved, by example, by bearings that are moveable on suitable guides, or by mounting the support on a plurality of pivot arms of unequal lengths. The lengths of such pivot arms can be adjusted as necessary.

摘要翻译： 响应于（例如）治疗期间患者的在线CT扫描的实时波束形状调整由放射治疗设备辅助，该放射治疗设备包括适于发射治疗辐射束的源，用于限定辐射束的准直器，准直器包括多个 的叶片彼此并排设置并且可纵向移动，使得叶片的尖端限定准直器的可变边缘，叶片安装在可相对于叶片侧向移动的支架上。 以这种方式，通过简单地移动准直器以适应这一点，可以适应垂直于叶运动方向的肿瘤运动。 优选的是，该设备还包括控制装置，该控制装置适于接收关于目标体积的位置的信息，并且基于该信息控制叶片的纵向位置和支撑体的横向位置。 还优选的是，当支撑件沿路径横向移动时，支撑件倾斜。 这可以通过例如可在合适的导轨上移动的轴承或通过将支架安装在多个不同长度的枢转臂上来实现。 这种枢轴臂的长度可以根据需要进行调整。

公开(公告)号：EP2153448A1

公开(公告)日：2010-02-17

申请号：EP07725522.2

申请日：2007-05-24

申请人： Elekta AB (publ)

发明人： PERKINS, Clifford, William ,  KNOX, Christopher, Charles

IPC分类号： G21K1/04

CPC分类号： G21K1/04 ,  A61N5/1042 ,  G21K1/046

摘要： A radiotherapy apparatus comprises a means for producing a beam of radiation directed along a beam axis and having a width in first and second directions transverse to the beam axis, a multi-leaf collimator for selectively limiting the width of the beam in at least the first direction, a block collimator for selectively limiting the width of the beam in at least the second direction, the block collimator comprising a diaphragm moveable into and out of the beam and having a thickness in the direction of the beam axis that varies. The diaphragm can have a front edge of greater thickness than at least one region behind the front edge. It can also have a spine region extending from a rear part thereof towards the front edge that is greater thickness than at least one region displaced laterally with respect thereto. Together, these can cover the areas that will not be fully shadowed by a dynamically moving MLC. A control means for the multi-leaf collimator can be arranged to extend leaves of the multi-leaf collimator to shadow regions of the beam that are blocked by a relatively thinner section of the diaphragm. This is made easier if the spine region extends from the rearmost part of the diaphragm, the spine region extends to the front edge of the diaphragm, the spine region is straight, the spine region is a central region of the diaphragm, and if the width of the spine region increases towards the front edge of the diaphragm. The present invention also relates to a radiotherapy apparatus comprising a multi-leaf collimator and a block collimator, the block collimator comprising a diaphragm with variable thickness, and to a block collimator for use in radiotherapy apparatus comprising a diaphragm moveable into and out of a beam, and having a thickness in the direction of the beam axis that varies.

公开(公告)号：EP2147410A1

公开(公告)日：2010-01-27

申请号：EP07725337.5

申请日：2007-05-17

申请人： Elekta AB (publ)

发明人： VAN HERK, Marcel ,  SONKE, Jon-Jakob ,  ZIJP, Lambert ,  REMEIJER, Peter

IPC分类号： G06T11/00

CPC分类号： G06T11/006 ,  G06T2211/412 ,  G06T2211/421 ,  G06T2211/428

摘要： An in-line 4D cone beam CT reconstruction algorithm, i.e. one that works in parallel with image acquisition, comprises an imaging system for a object exhibiting internal periodic motion comprising a source of penetrating radiation and a two-dimensional detector for the radiation, the source and the detector being rotateable around an axis lying on the beam path from the source to the detector, a storage means for images obtained from the detector, a control means for initiating rotation of the source and the detector and for obtaining images from the detector at a plurality of rotation angles over time, a processing means for (i) condensing the images in a direction transverse to an axis to produce a one-dimensional image, (ii) collating the one-dimensional images obtained up to that point side-by-side into a two dimensional image, (iii) analysing the two-dimensional image thus obtained to identify periodic patterns, (iv) allocating phase information to the images in the storage means on the basis of that analysis, (v) selecting images in the storage means having like phase information, and (vi) backprojecting the selected images, the control means being adapted to invoke the processing means after a plurality of images have been placed in the storage means, and then place further images in the storage means and further invoke the processing means. Thus, we queue a limited number of projection images such that the phase determination algorithm can look-ahead. At regular intervals, the queue is scanned and those images which have enough look-ahead to obtain phase information are filtered and back-projected. The algorithm thus keeps up with the image acquisition speed and produces a 4D reconstruction within a few seconds of the end of scanning. A local rigid registration algorithm is then used to match the tumor region defined in the mid-ventilation frame of our 4D planning CT with each of the phases of the 4D CBCT. An animation technique provides rapid visual verification; the mean position of the tumor is computed and used for correction, while the amplitude is reviewed to validate the margin.

公开(公告)号：EP2073705A1

公开(公告)日：2009-07-01

申请号：EP06806172.0

申请日：2006-10-11

申请人： Elekta AB (publ)

发明人： KNOX, Christopher ,  LONG, Andrew ,  BROWN, Kevin

IPC分类号： A61B6/00 ,  A61N5/10 ,  A61B5/113

CPC分类号： A61B6/5217 ,  A61B5/113 ,  A61B6/541 ,  A61N5/1064 ,  A61N2005/1061

摘要： For Respiration Correlated Cone Beam CT scanning, we have observed that improvements in the frame rate are in fact undesirable. We therefore propose a radiographic apparatus comprising a beam of radiation and a detector therefor, adapted to obtain a two dimensional image of the beam after passing through a cyclically varying object to be investigated, a processor adapted to review the images and select images at like points in the cycle, and a control means for the beam of radiation adapted to activate the beam periodically. The control means can activate the beam at a frequency of between .5 and 5 Hertz, more preferably between 1 and 3 Hertz, which corresponds (roughly) to a frequency that is between 6 and 10 times the frequency of the cyclical variation. It will assist if the selected point of the cycle is an extremity thereof, as the rate of change in these areas is at a minimum. Thus, slight mismatches between the two cycles will then have only a small effect. Typically, the object will be a patient and the cyclical variation will be the patient's breathing cycle.

摘要翻译： 对于呼吸相关锥束CT扫描，我们已经观察到帧频的改善实际上是不希望的。 因此，我们提出了一种包括辐射束及其检测器的放射线照相设备，其适于在通过要被研究的循环变化对象之后获得该束的二维图像，处理器适于检查图像并在相似点处选择图像 在该周期中，以及用于辐射束的控制装置，该控制装置适于周期性地激活该束。 控制装置可以以0.5和5赫兹之间，更优选1和3赫兹之间的频率激活光束，该频率对应（大致）对应于周期性变化频率的6到10倍的频率。 如果所选择的循环点是其末端，这将有所帮助，因为这些区域的变化率最小。 因此，两个周期之间的轻微不匹配只会产生很小的影响。 通常情况下，对象将是病人，周期性变化将是病人的呼吸循环。

公开(公告)号：EP0982597A3

公开(公告)日：2009-01-28

申请号：EP99660135.7

申请日：1999-08-26

申请人： ELEKTA AB (publ.)

发明人： Simola, Juha ,  Tuoriniemi, Juha ,  Kajola, Matti ,  Parkkonen, Lauri ,  Ahonen, Anti

IPC分类号： G01R33/025 ,  G01D3/028 ,  G01R33/035

CPC分类号： G01R33/0354 ,  G01D3/032 ,  G01R33/025 ,  G01R33/0356 ,  G01R33/0358 ,  G01R33/1269

摘要： A method and apparatus is described for making multichannel measurements of weak signals in noisy environments. The method is based on an adaptive compensation technique in which the large interfering background signal is first recorded by using the apparatus itself. By a statistical analysis of this multichannel measurement the independent components of the interference are determined. The apparatus is provided with compensator elements which are properly coupled to individual sensors for both to collect and distribute information on the interference during the measurement. The proper couplings are derived from the interference measurement mentioned above. In this way the output of the device can be made immune to the large amplitude interference components present in its environment. This reduces the dynamic range requirement for the data transport and storage systems.

公开(公告)号：EP1868684B1

公开(公告)日：2008-09-17

申请号：EP06742570.2

申请日：2006-04-12

申请人： Elekta AB (publ)

发明人： CARLSSON, Per ,  HEDIN, Lars

IPC分类号： A61N5/10

CPC分类号： A61N5/1049 ,  A61N5/1084

摘要： Calibration of a radiation therapy system comprising a radiation unit (10) with a fixed focus point, a fixation unit (50) for fixing a treatment volume in a patient, and a positioning system (20). The positioning system (20) comprises a fixed framework (22), a movable carriage (24) for carrying and moving the entire patient, motor (s), a control system for controlling the motor (s), and at least one engagement point (30, 32) for releasably mounting the fixation unit (50) in fixed engagement with the positioning system (20). A fixation unit coordinate system defined in relation to the fixation unit (50) is provided. Linearity errors for the motional axes of the carriage (24) and the angular offset between the motional axes and the coordinate system is determined, whereby the relationships between the axes of the coordinate system and the motional axes of the positioning system (20) are determined. The positioning system is then mounted in fixed relationship with the radiation therapy unit (10) and the focus point in relation to the positioning system (20) is determined, whereby the relationship between the focus point and the coordinate system is also determined.

公开(公告)号：EP1662992B1

公开(公告)日：2008-09-10

申请号：EP04767046.8

申请日：2004-09-14

申请人： Elekta AB (publ)

发明人： TAULU, Samu, c/o Elekta Neuromag Oy

IPC分类号： A61B5/04 ,  G01N19/00

CPC分类号： A61B5/04005

摘要： The invention relates to a method for interpreting the current distribution of an object being measured using basis vector components calculated from the measured signals. The components in question have been so selected that they describe the features, as independent as possible, of the current distribution being examined, which enhances the computation and makes it more accurate. This is achieved by converting the measured signals into a more natural form from the standpoint of the current distribution while totally eliminating the signals associated with the external interferences. A conversion of this kind has been described e.g. in patent publication F120030392. After the conversion, the source modelling is performed in an optimal manner using the basis vector components of the signal space instead of the actual measurement signals. One substantial feature of the invention is that after the conversion, the source model need not be regularised any more.