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：EP2670308B1

公开(公告)日：2016-07-27

申请号：EP11706737.1

申请日：2011-02-04

申请人： Elekta AB (PUBL)

发明人： KNOX, Christopher, Charles ,  WINFIELD, Colin ,  BROWN, Kevin

IPC分类号： A61B6/00 ,  A61N5/10 ,  A61B6/03

CPC分类号： A61B6/032 ,  A61B6/4233 ,  A61B6/466 ,  A61N2005/1061

公开(公告)号：EP2670308A1

公开(公告)日：2013-12-11

申请号：EP11706737.1

申请日：2011-02-04

申请人： Elekta AB (PUBL)

发明人： KNOX, Christopher, Charles ,  WINFIELD, Colin ,  BROWN, Kevin

IPC分类号： A61B6/03 ,  A61N5/10

CPC分类号： A61B6/032 ,  A61B6/4233 ,  A61B6/466 ,  A61N2005/1061

摘要： An apparatus has a patient support, a rotatable gantry supporting a source of imaging radiation, and a radiation detector that operates in a cyclical pattern of an exposure phase followed by a readout phase. For a first detector cycle in which the gantry has a first angle of rotation, the source of radiation is controlled to emit a first radiation beam pulse during the exposure phase, and respective first imaging data is read out during the readout phase. For a second, subsequent detector cycle, it is determined if the gantry has rotated through at least a threshold angular displacement relative to said first angle of rotation, and if so, the source of radiation is controlled to emit a second radiation beam pulse during the exposure phase, and respective second imaging data is read out during the readout phase.

公开(公告)号：EP2153448B1

公开(公告)日：2012-07-25

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： A61N5/10 ,  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.