公开(公告)号：US20190175944A1

公开(公告)日：2019-06-13

申请号：US16212078

申请日：2018-12-06

Applicant: Elekta Limited

Inventor： Stephen Towe ,  Begoña Vivas-Maiques ,  Janusz Harasimowicz ,  David Reberts

IPC: A61N5/10

Abstract: A method of determining the shape of a radiation beam of a radiotherapy system at a treatment position, the system comprising a radiation source and a multi-leaf collimator disposed between the radiation source and the treatment position. The multi-leaf collimator includes an array of moveable leaves positioned to intersect and block parts of the radiation beam to define the shape of the radiation beam at the treatment position. The leaves of a group are aligned such that the planes of the leaves in that group converge at a point displaced laterally from the radiation source. The method includes, for each leaf in the array positioned to intersect the radiation beam, determining a projected width with respect to the radiation beam, the projected width being greater than the thickness of the respective leaf, and using the projected leaf width to determine the shape of the radiation beam at the treatment position.

公开(公告)号：US11850446B2

公开(公告)日：2023-12-26

申请号：US17250393

申请日：2019-07-15

Applicant: Elekta Limited

Inventor： Ian Shinton ,  Janusz Harasimowicz ,  George Chadwick ,  Paul Dixon

IPC: A61N5/10

CPC classification number: A61N5/1049 ,  A61N5/1081 ,  A61N2005/1055 ,  A61N2005/1094

Abstract: A radiotherapy apparatus adapted for use with a Magnetic Resonance Imaging (MRI) system, the radiotherapy apparatus comprising a linear accelerator, the linear accelerator including an electron source. In the linear accelerator electrons which are introduced by the source are accelerated to impact on a target and produce a beam of radiotherapeutic radiation. The linear accelerator has an accelerator waveguide within which the electrons are accelerated and an external waveguide enclosure; this enclosure extends substantially continuously over the accelerator waveguide. The waveguide enclosure is formed of a high magnetic permeability material and has a first aperture for the beam of radiotherapeutic radiation where the beam exits the waveguide enclosure and enters the MRI system and a second aperture for an RF guide for the introduction of electrons into the accelerator waveguide and for electrical lines for the particle source and coolant lines for the waveguide to pass through the enclosure and no other openings. The waveguide enclosure is preferably fabricated in a plurality of discrete parts.

公开(公告)号：US20210290978A1

公开(公告)日：2021-09-23

申请号：US17250393

申请日：2019-07-15

Applicant: Elekta Limited

Inventor： Ian Shinton ,  Janusz Harasimowicz ,  George Chadwick ,  Paul Dixon

IPC: A61N5/10

Abstract: A radiotherapy apparatus adapted for use with a Magnetic Resonance Imaging (MRI) system, the radiotherapy apparatus comprising a linear accelerator, the linear accelerator including an electron source. In the linear accelerator electrons which are introduced by the source are accelerated to impact on a target and produce a beam of radiotherapeutic radiation. The linear accelerator has an accelerator waveguide within which the electrons are accelerated and an external waveguide enclosure; this enclosure extends substantially continuously over the accelerator waveguide. The waveguide enclosure is formed of a high magnetic permeability material and has a first aperture for the beam of radiotherapeutic radiation where the beam exits the waveguide enclosure and enters the MRI system and a second aperture for an RF guide for the introduction of electrons into the accelerator waveguide and for electrical lines for the particle source and coolant lines for the waveguide to pass through the enclosure and no other openings. The waveguide enclosure is preferably fabricated in a plurality of discrete parts.

公开(公告)号：US20200023204A1

公开(公告)日：2020-01-23

申请号：US16276679

申请日：2019-02-15

Applicant: Elekta Limited

Inventor： David Anthony Roberts ,  Janusz Harasimowicz ,  Peter Doherty ,  Mark Strangeman

IPC: A61N5/10

Abstract: Apparatus for measuring radiation beam energy output from a radiation beam source, comprising a first beam energy sensor at a first distance from the radiation beam source along the radiation beam axis; a second beam energy sensor located at a second distance from the radiation beam source along the radiation beam axis; and an energy absorbing layer, for example a layer that removes a part of the low energy content of the beam or a layer that absorbs at least 1% of the beam energy, located between the first and second sensors, and positioned such that radiation passing through the first sensor also passes through the energy absorbing layer before entering the second sensor.

公开(公告)号：US11052266B2

公开(公告)日：2021-07-06

申请号：US16276679

申请日：2019-02-15

Applicant: Elekta Limited

Inventor： David Anthony Roberts ,  Janusz Harasimowicz ,  Peter Doherty ,  Mark Strangeman

IPC: A61N5/10 ,  G01T1/185 ,  G01T1/29

Abstract: Apparatus for measuring radiation beam energy output from a radiation beam source, comprising a first beam energy sensor at a first distance from the radiation beam source along the radiation beam axis; a second beam energy sensor located at a second distance from the radiation beam source along the radiation beam axis; and an energy absorbing layer, for example a layer that removes a part of the low energy content of the beam or a layer that absorbs at least 1% of the beam energy, located between the first and second sensors, and positioned such that radiation passing through the first sensor also passes through the energy absorbing layer before entering the second sensor.

公开(公告)号：US10818404B2

公开(公告)日：2020-10-27

申请号：US16212078

申请日：2018-12-06

Applicant: Elekta Limited

Inventor： Stephen Towe ,  Begoña Vivas-Maiques ,  Janusz Harasimowicz ,  David Roberts

IPC: A61N5/10 ,  G21K1/04

Abstract: A method of determining the shape of a radiation beam of a radiotherapy system at a treatment position, the system comprising a radiation source and a multi-leaf collimator disposed between the radiation source and the treatment position. The multi-leaf collimator includes an array of moveable leaves positioned to intersect and block parts of the radiation beam to define the shape of the radiation beam at the treatment position. The leaves of a group are aligned such that the planes of the leaves in that group converge at a point displaced laterally from the radiation source. The method includes, for each leaf in the array positioned to intersect the radiation beam, determining a projected width with respect to the radiation beam, the projected width being greater than the thickness of the respective leaf, and using the projected leaf width to determine the shape of the radiation beam at the treatment position.