ACCELERATOR SYSTEM AND METHOD FOR SETTING PARTICLE ENERGY

• US 20110006214A1
• Filed: 06/28/2010
• Published: 01/13/2011
• Est. Priority Date: 07/08/2009
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: BÖNIG, MARC-OLIVER
• Application Number:
  US12/824,919
• Publication Number:
  US 20110006214A1
• Time in Patent Office: Days
• US Class Current: 250/396.R
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: A61N 5/1043 Scanning the radiation beam, e.g. spot scanning or raster scanning
• CPC Class Codes: A61N 5/1077 Beam delivery systems
• CPC Class Codes: A61N 5/1079 Sharing a beam by multiple treatment stations
• CPC Class Codes: H05H 2007/122 by electromagnetic means, e.g. RF cavities
• CPC Class Codes: H05H 2277/11 Radiotherapy
• CPC Class Codes: H05H 7/12 Arrangements for varying final energy of beam
• CPC Class Codes: H05H 7/18 Cavities; Resonators travelling-wave tubes H01J23/18; hyperfrequency cavities in general H01P7/04, H01P7/06

Abstract

An accelerator system includes an accelerator unit for accelerating particles and a beam transport section that guides the particles from the accelerator unit to a location that is remote from the accelerator unit. An RF cavity generates an electromagnetic RF field that interacts with the particles guided in the beam transport section is disposed along the beam transport section. A phase and a frequency of the RF field are set such that a variation in the energy of the particles interacting with the RF field is generated.

Claims

1. An accelerator system comprising:

an accelerator unit for accelerating particles; and

a beam transport section that follows on from the accelerator unit and guides particles that are accelerated by and have been extracted from the accelerator unit, from the accelerator unit to a location that is remote from the accelerator unit,

wherein an RF cavity that generates an electromagnetic RF field that interacts with the particles guided in the beam transport section is disposed along the beam transport section, and

wherein a phase and a frequency of the electromagnetic RF field are set such that a variation in the energy of the particles interacting with the RF field is generated.

2. The accelerator system as claimed in claim 1, wherein the accelerator system is a particle therapy system, the accelerator system comprising a control device that is configured for:

loading an irradiation planning data set; and

controlling the accelerator system as a function of the loaded irradiation planning data set.

3. The accelerator system as claimed in claim 2, wherein the irradiation planning data set comprises a parameter that characterizes a particle energy that is to be set, and

wherein the control device is configured for setting the particle energy by activating the accelerator unit and the RF cavity such that the accelerator unit accelerates the particles to a first energy level, which is subsequently modified using the RF cavity such that the particle energy stored in the irradiation planning data set is set.

4. The accelerator system as claimed in claim 2, further comprising a device for detecting a position of a target volume that is to be irradiated,

wherein the control device is configured for activating the RF cavity as a function of the position of the target volume that is to be irradiated.

5. The accelerator system as claimed in claim 1, wherein the RF cavity is superconducting.

6. The accelerator system as claimed in claim 1, wherein the RF cavity is dimensioned such that the RF cavity is operable to generate an RF field having a field strength of at least 20 MV/m.

7. The accelerator system as claimed in claim 1, wherein the RF cavity extends over a length in the beam propagation direction of at least 1 m.

8. The accelerator system as claimed in claim 1, wherein the RF cavity is dimensioned such that an energy modulation of the particle beam traversing the RF cavity is achieved using the RF cavity, and

wherein the energy modulation of the particle beam corresponds to a modulation of the penetration depth into a water-equivalent body of at least 1 cm.

9. The accelerator system as claimed in claim 1, wherein the particles are accelerated, using the accelerator unit, to an energy that corresponds to a penetration depth into a water-equivalent body of at least 15 cm.

17. The accelerator system as claimed in claim 2, wherein the RF cavity is dimensioned such that the RF cavity is operable to generate an RF field having a field strength of at least 20 MV/m.

18. The accelerator system as claimed in claim 2, wherein the RF cavity is dimensioned such that an energy modulation of the particle beam traversing the RF cavity is achieved using the RF cavity, and

wherein the energy modulation of the particle beam corresponds to a modulation of the penetration depth into a water-equivalent body of at least 1 cm.

19. The accelerator system as claimed in claim 3, further comprising a device for detecting a position of a target volume that is to be irradiated,

wherein the control device is configured for activating the RF cavity as a function of the position of the target volume that is to be irradiated.

20. The accelerator system as claimed in claim 6, wherein the RF cavity extends over a length in the beam propagation direction of at least 1 m.

10. A method for setting the energy of particles that are accelerated in an accelerator system, the method comprising:

accelerating the particles to a first energy level using an accelerator unit; and

guiding the accelerated particles from the accelerator unit to an irradiation room,

wherein guiding the accelerated particles from the accelerator unit to the irradiation room comprises guiding the accelerated particles through an RF cavity, in which an RF field acts on the particles, and

wherein a phase and a frequency of the RF field are set such that the energy of the particles passing through the RF cavity is modified.

11. The method as claimed in claim 10, wherein a predefined energy is set for the particles in that the particles are initially accelerated to the first energy level, and the energy of the particles accelerated to the first energy level is modified with the aid of the RF cavity to set the predefined energy.

12. The method as claimed in claim 10, wherein the energy of the particles accelerated to the first energy level is variably modified through variation of the phase of the RF field acting on the particles.

13. The method as claimed in claim 10, wherein the energy of the particles accelerated to the first energy level is modified as a function of a movement of a target volume that is to be irradiated.

14. The method as claimed in claim 11, wherein the energy of the particles accelerated to the first energy level is variably modified through variation of the phase of the RF field acting on the particles.

15. The method as claimed in claim 11, wherein the energy of the particles accelerated to the first energy level is modified as a function of a movement of a target volume that is to be irradiated.

16. The method as claimed in claim 12, wherein the energy of the particles accelerated to the first energy level is modified as a function of a movement of a target volume that is to be irradiated.