公开(公告)号：US20190151683A1

公开(公告)日：2019-05-23

申请号：US16196658

申请日：2018-11-20

Applicant: Elekta Limited

Inventor： David Anthony Roberts

IPC: A61N5/10

Abstract: A method of operating a radiotherapy system mounted on a gantry surrounding a magnetic resonance imaging system is provided, the radiotherapy system comprising a radiotherapy beam generator, and a radiotherapy imaging system, wherein the gantry is arranged to rotate the radiotherapy beam generator around the magnetic resonance imaging system. The method comprises obtaining a reference image, the reference image including a predetermined feature of the magnetic resonance imaging system located near the radiotherapy imaging system; rotating the gantry relative the magnetic resonance imaging system; obtaining a second image, the second image including the predetermined feature of the magnetic resonance imaging system located near the radiotherapy imaging system; and determining changes in the relative positions of the radiotherapy beam generator, the radiotherapy imaging system, and the magnetic resonance imaging system based on differences in the position of the predetermined feature in the reference image and in the further image.

公开(公告)号：US11065473B2

公开(公告)日：2021-07-20

申请号：US16196658

申请日：2018-11-20

Applicant: Elekta Limited

Inventor： David Anthony Roberts

IPC: A61N5/10

Abstract: A method of operating a radiotherapy system mounted on a gantry surrounding a magnetic resonance imaging system is provided, the radiotherapy system comprising a radiotherapy beam generator, and a radiotherapy imaging system, wherein the gantry is arranged to rotate the radiotherapy beam generator around the magnetic resonance imaging system. The method comprises obtaining a reference image, the reference image including a predetermined feature of the magnetic resonance imaging system located near the radiotherapy imaging system; rotating the gantry relative the magnetic resonance imaging system; obtaining a second image, the second image including the predetermined feature of the magnetic resonance imaging system located near the radiotherapy imaging system; and determining changes in the relative positions of the radiotherapy beam generator, the radiotherapy imaging system, and the magnetic resonance imaging system based on differences in the position of the predetermined feature in the reference image and in the further image.

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：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.