Combined MRI and radiotherapy installations require complex Faraday cage structure that encloses the room, the MRI magnets, and the patient volume, but excludes the linear accelerator path and its supply cabling. A problem with this is that the MRI magnets tend to vibrate when in use, and if physically connected to a rigid structure then the vibrations will be passed to that structure also. To alleviate this, we propose that the Faraday cage be made of a mix of prefabricated conductive sections and flexible sections of a conductive sheet. The flexible conductive sheet can be copper or aluminium, in the form of a foil or mesh.

A method of generating a radiotherapy plan for ion therapy, wherein the beam (6) is shaped by means of passive devices is arranged to allow variation in settings of at least one of the passive devices and/or the MU during the delivery of the beam and to control the movement of the patient and/or the beam in such a way as to create an arc. The arc is preferably a continuous arc or includes at least one continuous sub-arc. The method may include forward planning or optimization. In the latter case, the optimization uses an optimization problem set up to allow variation in settings of at least one of the range modulating device (9), the aperture element (11) and the MU during the delivery of the arc. Computer programs control the planning and the delivery.

Systems and techniques may be used for radiotherapy. An example system may include a fixation device arranged to receive and immobilize a patient. The example system may include a first filter arranged to extend along a first portion (e.g., a spine or cranium) of the patient, the first filter attached to the fixation device at a first location, the first filter including a plurality of beam attenuating elements. The example system may include a fixed beam proton delivery system arranged to deliver a therapeutic proton radiation dose attenuated via the first filter to the first portion of the patient.

A particle irradiation system includes three or more scanning magnets that scan a beam in a vertical direction (first direction) or a horizontal direction (second direction) perpendicular to each other. The three or more scanning magnets are configured such that the scanning magnets and the scanning magnets for scanning in the same direction between the vertical direction or the horizontal direction, are disposed in series on a progressing direction axis of a beam, and a volume of a magnetic field feeding region decreases as the scanning magnet is installed at a position farther from an isocenter on the progressing direction axis.

A particle beam therapy apparatus 10 includes: a particle beam irradiator 16 outputting a particle beam B; a movable supporting structure 21 supporting the particle beam irradiator 16; movable plates 37 disposed on a displacement trajectory of the particle beam irradiator 16, forming a substantially horizontal enveloping surface below a table 18 for placing an irradiation object 13, and including first and second floor members in at least one of the movable plates 37, the second floor member being larger in X-ray transmittance than the first floor member; an X-ray generator 27a provided in a non-collision area 31 where the X-ray generator 27a does not collide with any of the particle beam irradiator 16, the supporting structure 21, and the movable plates 37; and an X-ray detector 27b installed at a position where the X-ray detector 27b faces the X-ray generator 27a.

A photon source emits a flattening filter-free photon beam. A control circuit operably couples to a multi-layer multi-leaf collimator that is disposed between the photon source and a treatment area of a patient. The control circuit automatically arranges operation of some, but not all, of the layers of the multi-layer multi-leaf collimator to serve as a virtual flattening filter with respect to the flattening filter-free photon beam emitted by the photon source. By one approach, another of the layers of the multi-layer multi-leaf collimator serves to form a treatment aperture corresponding to a shape of the treatment area of the patient. By one approach the control circuit comprises an integral part of a treatment platform (as versus a dedicated treatment planning platform) and can carry out most or even essentially all of the planning steps that lead to administration of the treatment to a patient.

According to an embodiment, a particle beam treatment system includes a storage, an estimator, a target value generator, and a particle beam treatment device. The storage stores therein a respiratory movement model obtained by synchronizing amount of displacement of an affected area of a subject with a signal related to respiration of the subject and performing modeling. The estimator estimates, based on the measured signal related to respiration and the respiratory movement model, amount of displacement of the affected area corresponding to the measured signal. The target value generator generates a target value, which is used for performing movement control on a platform on which the subject is lying down, corresponding to the estimated amount of displacement of the affected area. The particle beam treatment device irradiates, with particle beams, the affected area of the subject on the platform subjected to movement control according to the target value.

A radiation treatment session is initiated to deliver a therapeutic radiation beam from a therapeutic radiation source to a target. One or more X-ray radiation sources are caused to deliver an imaging radiation beam from the one or more X-ray radiation sources through the target to one or more X-ray detectors to acquire imaging data associated with the target during therapeutic radiation beam delivery. One or more volumetric images are constructed using the acquired imaging data.

The present disclosure provides a neutron capture therapy system, including an accelerator for generating a charged particle beam, a neutron generator for generating a neutron beam having neutrons after irradiation by the charged particle beam, and a beam shaping assembly for shaping the neutron beam. The beam shaping assembly includes a moderator and a reflecting assembly surrounding the moderator. The neutron generator generates the neutrons after irradiation by the charged particle beam. The moderator moderates the neutrons generated by the neutron generator to a preset energy spectrum. The reflecting assembly includes a reflecting assembly to deflected neutrons back to the neutron beam and a supporting member to support the reflectors. A lead-antimony alloy is for the reflecting assembly to mitigate a creep effect that occurs when only a lead material is for the reflectors, thereby improving the structural strength of a beam shaping assembly.

A particle beam therapy apparatus includes: a particle beam irradiator outputting a particle beam; a movable supporting structure supporting the particle beam irradiator; movable plates disposed on a displacement trajectory of the particle beam irradiator, forming a substantially horizontal enveloping surface below a table for placing an irradiation object, and including first and second floor members in at least one of the movable plates, the second floor member being larger in X-ray transmittance than the first floor member; an X-ray generator provided in a non-collision area where the X-ray generator does not collide with any of the particle beam irradiator, the supporting structure, and the movable plates; and an X-ray detector installed at a position where the X-ray detector faces the X-ray generator.