摘要:
A system for an intensity-modulated proton therapy of a predetermined volume (T) within an object (M) is disclosed, comprising:
a) a proton source in order to generate a proton beam (B) being adjustable with respect to the beam intensity; b) a degrader being optionally disposable in the proton beam (B) in order to attenuate the energy of the protons in the proton beam (B) to a desired proton energy in the proton beam (B); c) a number of proton beam bending and/or focusing units; d) a beam nozzle (N) having an outlet for the proton beam (B) to penetrate the predetermined volume (T) of the object (M); e) a beam bending magnet (A3) being disposed upstream of the nozzle (N); and f) a couple of sweeper magnets (WT, WU) being disposed upstream of said beam bending magnet (A3) in order to sweep the proton beam (B) in both lateral directions (T, U) before the proton beam (B) enters into the beam bending magnet (A3), g) said beam nozzle (N) is defining a cross-sectional scanning area (SF) substantially perpendicular to the proton beam (B) in the range of 10 to 30 cm 2 , and h) said sweeper magnets (WT, WU) and said beam bending magnet (A3) are controlled in order to guarantee a parallel beam orientation over the complete cross-sectional scanning area (SF).
摘要:
The invention concerns a device for irradiating a target with a hadron-charged beam, and its use in hadrontherapy. Said device comprises several corpuscular optical means (14, 16, 18, 20) to provide the beam density with uniformity along at least one direction perpendicular to its path and means (6, 22, 24) for three-dimensional control of the irradiation.
摘要:
A particle therapy system is provided which can simply and quickly correct a beam orbit. In a particle therapy system provided with an irradiation facility comprising a first beam transport system for receiving a beam and transporting the beam to the patient side, and an irradiation nozzle for forming an irradiation field of the beam, the particle therapy system comprises first beam position monitors for detecting a position upstream of the irradiation nozzle at which the beam passes, second beam position monitors for detecting a position downstream of the irradiation nozzle at which the charged-particle beam passes, and first and second steering magnets. Correction bending amounts for causing the beam to be coincident with a predetermined orbit after the correction are determined in accordance with detected results from the first and second beam position monitors, and first and second steering magnets are excited under control so that the determined correction bending amounts are obtained.
摘要:
A raster scan control system (18) for use with a charged-particle beam delivery system (20) provides precise control of large currents driving an inductive load. The beam delivery system includes a nozzle through which a charged-particle beam (24), such as a proton beam, passes prior to being directed to a target (32). The nozzle includes both fast and slow sweep scan electromagnets (204, 208) that cooperate to generate a sweeping magnetic field that steers the beam along a desired raster scan pattern at the target. The electromagnets are driven by large currents (213, 215) from the raster scan control system. The raster scan control system includes both fast and slow power amplifiers (212, 214) for delivering the desired large currents to the fast and slow electromagnets, respectively; monitoring means (206, 210) for monitoring the magnetic fields; sensing means (212, 230) for sensing the large currents; feedback means for maintaining the magnetic fields and large current at desired levels; out of tolerance means for automatically causing the servo power amplifiers to steer the beam away from the target area in the event the error signal becomes excessive; a programmable raster generator (80) for providing the fast and slow power amplifiers with a raster scan signal (216, 218) that defines the desired raster pattern; and a power supply (74) for delivering the requisite power to the power amplifiers and other components.
摘要:
Dispositif de déviation magnétique achromatique permettant de dévier d'un angle ∅ compris entre π et 2π un faisceau de particules chargées, accélérées, ayant différents moments de quantité de mouvement. Ce dispositif comporte un électro-aimant muni de pièces polaires délimitant trois secteurs (M 1 , M 2 , M 3 ) accolés, l'ensemble de ces secteurs (M 1 , M 2 , M 3 ), d'axe de symétrie XX, présentant des faces d'entrée (E) et de sortie (S) planes et des faces communes (F 1 et F 2 ) en arc de cercle, la position, le rayon de courbure de ces faces (F 1 , F 2 ) ainsi que la valeur de l'induction magnétique dans les secteurs (M 1 , M 2 , M 3 ) étant choisis de telle sorte que les différentes trajectoires soient orthogonales à la fois aux faces (F 1 , F 2 ) et à l'axe XX. Ce dispositif peut être utilisé dans les appareils de radiothérapie.
摘要:
In particle beam irradiation equipment (100), a control unit (2) causes a storage unit (3) to store, as position information of reference positions, position information of electromagnets (1, 1A, 1B) that is acquired at the time of their first alignment, by cameras (10, 10-1, 10-2, ···, 10-n), and then acquires displacement amounts, based on the position information of the reference positions stored in the storage unit 3 and from position information of the electromagnets (1, 1A, 1B) acquired at the time of their realignment, by the cameras (10, 10-1, 10-2, ···, 10-n).
摘要:
The present invention concerns an electron accelerator comprising: (a) a resonant cavity (1) consisting of a hollow closed conductor (b) an electron source (20) adapted for radially injecting a beam of electrons (40) into the resonant cavity, (c) an RF system coupled to the resonant cavity and adapted for generating an electric field, E, to accelerate the electrons of the electron beam along radial trajectories, (d) at least one magnet unit (30i) comprising a deflecting magnet adapted for generating a magnetic field in a deflecting chamber (31) in fluid communication with the resonant cavity by at least one deflecting window (31w), the magnetic field being adapted for deflecting an electron beam emerging out of the resonant cavity through the at least one deflecting window along a first radial trajectory in the mid-plane, Pm, and to redirect the electron beam into the resonant cavity through the at least one deflecting window towards the central axis along a second radial trajectory, characterized in that, the resonant cavity is formed by: • a first half shell (11), having a cylindrical outer wall of inner radius, R, and of central axis, Zc, • a second half shell (12), having a cylindrical outer wall of inner radius, R, and of central axis, Zc, and • a central ring element (13) of inner radius, R, sandwiched at the level of the mid-plane, Pm, between the first and second half shells, wherein the surface forming the outer conductor section is formed by an inner surface of the cylindrical outer wall of the first and second half shells, and by an inner edge of the central ring element.
摘要:
An object of this invention is to transport a charged particle beam having a distribution in which the particle-number variation at its end is moderate, without undesirably increasing the beam size. Assuming that a direction perpendicular to a traveling direction of the charged particle beam and passing from a center of the beam to its steep portion is an x-direction, a beam shaping device (10) included in a beam transport system (30) is provided with: a pre- stage quadrupole electromagnet (3) that reduces a distribution width of x-angle components (x') that are inclinations in the x-direction of the charged particles in the beam with respect to the traveling direction; a penumbra expander (1) that moderates an end profile of a particle-number distribution of the x-angle components (x') in the beam having passed through the pre-stage quadrupole electromagnet (3); and a post-stage quadrupole electromagnet (4) that adjusts a betatron phase in a phase-space distribution in the x-direction, of the beam having passed through the penumbra expander (1); wherein the post-stage quadrupole electromagnet (4) adjusts a phase advance angle of the betatron phase from the penumbra expander (1) to the isocenter (IC), to be in a range of an odd multiple of 90° ± 45°.