US 11,850,446 B2
Radiotherapy apparatus
Ian Shinton, Crawley (GB); Janusz Harasimowicz, Crawley (GB); George Chadwick, Crawley (GB); and Paul Dixon, Crawley (GB)
Assigned to ELEKTA LIMITED, Crawley (GB)
Appl. No. 17/250,393
Filed by Elekta Limited, Crawley (GB)
PCT Filed Jul. 15, 2019, PCT No. PCT/EP2019/069038
§ 371(c)(1), (2) Date Jan. 15, 2021,
PCT Pub. No. WO2020/016190, PCT Pub. Date Jan. 23, 2020.
Claims priority of application No. 1811630 (GB), filed on Jul. 16, 2018.
Prior Publication US 2021/0290978 A1, Sep. 23, 2021
Int. Cl. A61N 5/10 (2006.01)
CPC A61N 5/1049 (2013.01) [A61N 5/1081 (2013.01); A61N 2005/1055 (2013.01); A61N 2005/1094 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A radiotherapy apparatus adapted for use with a Magnetic Resonance Imaging (MRI) system, the apparatus comprising:
a linear accelerator adapted to be mounted to an exterior surface of the MRI system and having an accelerator waveguide within which electrons from a source are accelerated to impact on a target and produce a beam of radiotherapeutic radiation; and
an external waveguide enclosure which extends substantially continuously around the accelerator waveguide, the waveguide enclosure being formed of high magnetic permeability material, the waveguide enclosure including:
a first aperture for the beam of radiotherapeutic radiation where the beam exits the waveguide enclosure and enters the MRI system;
a second aperture for an RF guide configured for introduction of the electrons into the accelerator waveguide, for an electrical line from the source and a coolant line for the waveguide to pass through the waveguide enclosure; and
an interface flange for mounting is located between, on one side of the flange, the accelerator waveguide and the waveguide enclosure and on the other side of the flange the exterior of the MRI system, wherein the flange includes a waveguide enclosure end cap formed of high magnetic permeability material in which the first aperture is located.