WO2013107860A1 - Arrangement and method for generating accelerated particles from targets for radiotherapy - Google Patents
Arrangement and method for generating accelerated particles from targets for radiotherapy Download PDFInfo
- Publication number
- WO2013107860A1 WO2013107860A1 PCT/EP2013/050941 EP2013050941W WO2013107860A1 WO 2013107860 A1 WO2013107860 A1 WO 2013107860A1 EP 2013050941 W EP2013050941 W EP 2013050941W WO 2013107860 A1 WO2013107860 A1 WO 2013107860A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laser
- chamber
- target
- cutting
- free target
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1042—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H15/00—Methods or devices for acceleration of charged particles not otherwise provided for, e.g. wakefield accelerators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N2005/1085—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy characterised by the type of particles applied to the patient
- A61N2005/1087—Ions; Protons
- A61N2005/1088—Ions; Protons generated by laser radiation
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H2277/00—Applications of particle accelerators
- H05H2277/10—Medical devices
- H05H2277/11—Radiotherapy
Definitions
- the invention relates to devices and methods for generating accelerated particles from radiotherapy targets.
- targets which are acted upon by a focused pulsed laser beam. Particles are mostly protons. These are called targets
- structured metal foils for example foils with blocks of organic substances, or
- the document DE 1 814 888 discloses a method and a device for producing a thin, self-supporting, high-vacuum gaseous material at room temperature, such as hydrogen.
- a metal body having a hole whose diameter is so small that can form a lamella in the hole of the liquefied material cooled in a space containing the material in a gaseous state below the liquefaction temperature of the material until that at the surface condensing and draining liquefied material forms a liquid lamella spanning the opening of the metal body. Then, the temperature of the metal body is further lowered until the liquid fin solidifies.
- Document 10 2004 003 854 A1 relates to methods and apparatus for producing solid filaments in a vacuum chamber.
- a filamentary filament is produced from liquefied gases with increased temporal and spatial stability.
- the procedure and the device serve to provide long filaments.
- the invention specified in the claims 1 and 12 is based on the object to provide accelerated particles with largely the same energy for radiotherapy by converting a target.
- the devices and methods for generating accelerated particles from targets for radiotherapy are characterized in particular by the fact that by converting a target particles of largely the same energy are generated for radiotherapy.
- the device has at least one laser
- a free-floating or falling target emerges from the body.
- the properties of the particle beam are essentially determined by the properties of this target.
- the cutting of the target and the generation with subsequent acceleration of the particles takes place by applying laser radiation to the body of at least one laser.
- the application of the body and the target from the body can be effected successively by laser beams of the laser or by lasers.
- a laser for cutting and a laser for generating and accelerating the particles are thus present.
- a laser with a split laser beam can also be used, wherein a partial beam can be used for cutting and the other partial beam for generating and accelerating particles.
- Beam splitters for laser beams are known. In this case, partial beams of different intensity can be generated and used.
- laser beam guiding devices are known, so that laser beams can be deflected for cutting, for example with a movable mirror or molded with an axicon.
- the accelerated particles are used in radiation therapy.
- a tumor is irradiated during its treatment with the accelerated and thus high-energy particles. This is conveniently done in tumors that are either too deep in the body or surrounded by sensitive organs.
- the particle therapy allows for a more tumor-compatible dose distribution within the region to be irradiated compared to other types of radiation.
- the particles are protons.
- the device meets the following requirements: a) fast target change
- the transformation into a plasma destroys the target at least locally. If the target is, for example, a foil, depending on the total area only a few pulses of proton radiation can be generated until the foil has to be changed and during this time a radiation break to be avoided occurs. This can be done by cutting and immediately generating and accelerating the particles. Conveniently, several devices for supplying bodies or of liquid / gaseous bodies transferred into a solid phase in the chamber can also be provided for this purpose. b) Generation of particles of largely the same energy
- the position of the focal point of the laser for generating and accelerating the particles is only about as well defined as its size.
- the acceleration process depends, however also from the angles between the laser beam and the target surface.
- the target can have at least a flat surface. Even more advantageous is a target with two parallel surfaces, as it has a target as a target.
- a slice of the ball or the film is cut.
- a thread may be cut into slices, where the shape of the cross section may be a circle, an ellipse or a polygon.
- liquid or gaseous substances are used as bodies, which can be converted into the solid phase.
- Particles are preferably protons. In addition, however, particles may also be deuterons, ions of the atomic particles of the substances or combinations thereof.
- a favorable substance is according to the embodiment of claim 2 hydrogen, methane, oxygen, nitrogen, deuterium, carbon oxides or nitrogen oxides or a mixture of substances consisting of a combination of these substances.
- the target has according to the embodiment of claim 3 advantageously in the form of a spherical cap, a drop cap, a disc or a cuboid, so that at least a flat surface for the escape of the protons is present.
- the target according to the embodiment of claim 4 has the shape of a disc
- the chamber is according to the embodiment of claim 5 at least one holder for the body.
- the body With the holder, the body is arranged so that the laser beams of the laser cut the body and the resulting disc is separated as a free target from the holder.
- At least two holders for body are arranged so that the body of a holder cut and the body of the other holder is separated from this.
- the cutting leads to flat and correspondingly arranged cut surfaces.
- the holder is according to the embodiment of claim 7 advantageously simultaneously a nozzle for supplying either the body or the liquid / gaseous and in the solid phase to be transferred body.
- At least one aperture is arranged so that a drop of liquid substance reaches the closed by slats aperture and adheres to it by adhesion.
- the lamellae are coupled to a drive in such a way that a thin foil forms from the material when the aperture is opened and the foil freezes due to the expansion and evaporation of some molecules.
- a device for cutting out the laser beam of the laser is arranged so that a slice is cut out of the film by the laser beams.
- the laser beam can be controlled guided or shaped.
- the former can be done via a scanner.
- this is given by the generation of a laser beam with the cross section of a circular ring.
- at least two apertures coupled to at least one drive mechanism are arranged in the chamber, so that the apertures successively reach the positions for applying the drop of liquid and cutting out the disk as well as for producing and accelerating particles from the nozzle get free target. This largely generates a particle stream with a higher frequency in the Hz range.
- laser beam-guiding and / or laser-beam-splitting devices are arranged so that the laser beam of the laser is used both for cutting a disk of a ball, a thread or a film and for generating and accelerating particles from the free target.
- At least one laser beam guiding device is located according to the embodiment of claim 11 in the beam path of a first laser for cutting a disk of a ball, a thread or a film and in the beam path of a second laser for generating and accelerating particles from the free target. Furthermore, the laser beam-guiding devices are connected to a control device such that immediately after cutting with laser beams of the first laser, the particles are generated and accelerated from the free target with laser beams of the second laser.
- Fig. 2 shows a nozzle with a free target of a cylindrical thread of frozen hydrogen for the generation of accelerated protons
- Fig. 3 shows a screen with a free target of a film of frozen hydrogen for the generation of accelerated protons.
- a device for generating accelerated particles for radiotherapy Hydrogen targets 1 as body 1 consists essentially of
- At least one laser for cutting a disc 1 as a body 1 and thus as a free target 3 and for generating and accelerating protons 5 as particles.
- the chamber is provided with at least one device for supplying frozen hydrogen bodies 1 or liquid hydrogen freezing in the chamber.
- balls 1 or drops 1 are thus produced as a body 1 on a nozzle 2 or via a nozzle 2.
- FIG. 1 shows a realization of a disk as a free target 3 from a sphere 1 of frozen hydrogen for the production of accelerated protons 5 in a basic representation.
- the sphere 1 is a hydrogen sphere 1 with a diameter of, for example, 50 ⁇ m.
- a liquid jet is known to be pressed out of the nozzle 2.
- the nozzle 2 is further excited with ultrasound, so that the liquid jet is not quite uniform. Due to the surface tension and the increasingly higher speed, the jet breaks off in drops 1. Because of the surface tension, these are largely spheres 1, which then freeze due to the evaporation of the high-energy hydrogen molecules as the body 1.
- the ultrasound serves to reproduce the body 1.
- a thread 1 is generated in the chamber as a body 1 of frozen hydrogen.
- 2 shows a nozzle 2 with a free target 3 of a cylindrical thread 1 of frozen hydrogen for the production of accelerated protons 5 in a basic representation.
- the thread 1 in this case has the shape of a circle or an ellipse in cross section.
- the laser radiation of the laser are provided by the cuts S1 and S2 corresponding to each other and flat surfaces.
- section S3 a section is separated as a disc and thus free target 3.
- the existing according to the section S3 free target 3 in the chamber is converted by means of the laser radiation 4 of the laser or another laser in a plasma and accelerates the released protons 5.
- the device for supplying liquid hydrogen is arranged in a second embodiment so that liquid hydrogen enters the chamber drop by drop.
- the chamber there is at least one closed by slats aperture 6, to which a drop of hydrogen passes.
- FIG. 3 shows a diaphragm 6 with a free target 3 of a foil 7 of frozen hydrogen for the production of accelerated protons 5 in a basic representation.
- the drop adheres to the slats of the panel 6.
- the latter are coupled to a drive. With the opening and enlargement of this opening caused by the drive, a thin film 7 now spans out as a body 1 of hydrogen. By the expansion and evaporation of some hydrogen molecules, the film 7 freezes.
- the diaphragm 6 and thus the film 7 are brought to the target position and cut out a circular disk as a free target 3 from the film 7 as a body 1 with laser beams of at least one laser.
- the laser radiation is guided circularly by means of a scanner or an axicon is arranged in the laser radiation.
- the laser beam 4 or the laser radiation 4 of a second laser is focused on the target 3 floating freely for a moment after cutting, wherein
- At least a portion of the target 3 is converted into a plasma
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation-Therapy Devices (AREA)
- Particle Accelerators (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112013000633.2T DE112013000633B4 (en) | 2012-01-19 | 2013-01-18 | Device for generating accelerated particles from radiotherapy targets |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012200748 | 2012-01-19 | ||
DE102012200748.2 | 2012-01-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013107860A1 true WO2013107860A1 (en) | 2013-07-25 |
Family
ID=47603671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2013/050941 WO2013107860A1 (en) | 2012-01-19 | 2013-01-18 | Arrangement and method for generating accelerated particles from targets for radiotherapy |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112013000633B4 (en) |
WO (1) | WO2013107860A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1814888A1 (en) | 1968-12-16 | 1970-07-16 | Inst Plasmaphysik Gmbh | Method and device for producing a thin, self-supporting disc in a high vacuum from a material that is gaseous at room temperature, such as hydrogen |
US20020090194A1 (en) * | 2000-08-09 | 2002-07-11 | The Regents Of The University Of California | Laser driven ion accelerator |
DE102004003854A1 (en) | 2004-01-26 | 2005-08-18 | MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. | Methods and apparatus for producing solid filaments in a vacuum chamber |
US20110101244A1 (en) * | 2009-11-02 | 2011-05-05 | Electronics And Telecommunications Research Institute | Target materials for generating protons and treatment apparatuses including the same |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3907477A (en) * | 1974-02-26 | 1975-09-23 | Us Energy | Apparatus for producing laser targets |
GB9612563D0 (en) * | 1996-06-15 | 1996-08-21 | Int Distillers & Vintners Limi | Dispensing outlet assembly |
AU2003303542A1 (en) * | 2003-01-02 | 2004-07-29 | Jmar Research Inc. | Method and apparatus for generating a membrane target for laser produced plasma |
-
2013
- 2013-01-18 DE DE112013000633.2T patent/DE112013000633B4/en not_active Expired - Fee Related
- 2013-01-18 WO PCT/EP2013/050941 patent/WO2013107860A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1814888A1 (en) | 1968-12-16 | 1970-07-16 | Inst Plasmaphysik Gmbh | Method and device for producing a thin, self-supporting disc in a high vacuum from a material that is gaseous at room temperature, such as hydrogen |
US20020090194A1 (en) * | 2000-08-09 | 2002-07-11 | The Regents Of The University Of California | Laser driven ion accelerator |
DE102004003854A1 (en) | 2004-01-26 | 2005-08-18 | MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. | Methods and apparatus for producing solid filaments in a vacuum chamber |
US20110101244A1 (en) * | 2009-11-02 | 2011-05-05 | Electronics And Telecommunications Research Institute | Target materials for generating protons and treatment apparatuses including the same |
Also Published As
Publication number | Publication date |
---|---|
DE112013000633B4 (en) | 2015-12-31 |
DE112013000633A5 (en) | 2014-10-23 |
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