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

Definitions

• the invention relates to a radiotherapy device and to a method for generating an increased resolution in irradiated irradiation fields and - associated therewith - the irradiated dose distribution.
• Radiation therapy devices are used in a known manner for treatmen ⁇ development of diseases such as tumors.
• high-energy X-rays are usually irradiated to a target volume to be irradiated, such as a human body or a phantom for research or research
• the dose distribution is adapted to the target volume to be irradiated.
• the radiotherapy device has:
• a radiation source for example an X-ray source, from which a beam for irradiation can be directed to a target volume from at least two mutually opposite directions,
• a collimator having a plurality of collimator elements for confining the treatment beam to produce a collimator element
• the dose distribution in the irradiation volume is determined by sequential application of two
• Beam bundles composed of opposite spatial directions, wherein the axes of the beams are offset by a fraction ⁇ part, for example, by half or by a quarter, the resolution of the collimator.
• the resolution of the achievable in Bestrah ⁇ lung volume dose distribution is effectively doubled.
• the invention thus permits to achieve an improved ver ⁇ local dose distribution in radiation therapy equipment such as X-ray therapy devices.
• the advantage with such a radiation therapy device is a halving or quartering of the collimator elements required for achieving a certain resolution of the dose distribution, eg lamellae or needles, depending on the design of the collimator. It can thus achieve a significant association ⁇ fold increase and reduce the complexity of Strahlformungsme ⁇ mechanism.
• the radiation from opposite directions can take place sequentially.
• the width of a Lamel ⁇ le, for example, - - with a collimator for example, by extending the collimator a minimum resolution in a direction of an saudi ⁇ dimensional irradiation field be predetermined or depending on the design of the collimator in the two directions of the two-dimensional irradiation field.
• This resolution can be increased if, in the second irradiation field irradiated from the opposite direction, an offset of the beam takes place in exactly this direction by a fraction of the resolution of the collimator.
• the radiation therapy device may be a cylindrical geometry aufwei ⁇ sen, which means that the radiation source and the collimator are mounted for rotation about an axis of rotation around an isocenter.
• the collimator can be arranged such that the expansion of the collimator elements predetermines a minimum resolution of the irradiation field in the direction of the axis of rotation.
• Offset device may then be configured to effect an offset along the axis of rotation.
• the desalination is effected here by offsetting in the direction of rotation, e.g. by a quarter or by half the resolution.
• the radiation source and the collimator can also be rotatably mounted about an axis of rotation about an isocenter, and the collimator can be arranged such that the extension of the collimator defining a minimum resolution of the irradiation field in a direction perpendicular to Rota ⁇ tion axis.
• the offset device is then purchasedbil ⁇ det to cause an offset perpendicular to the axis of rotation.
• the field is offset by a quarter, results in Ein ⁇ radiation from opposite directions, an offset by a total of half the resolution of the irradiation field.
• This embodiment has the advantage that the offset in pure ent ⁇ oppositely radiated fields caused by the geometrical arrangement of the collimator generic already an advantage.
• the second irradiation field is offset from the first irradiation field by a fraction of the resolution.
• the second irradiation field may be sequentially irradiated to the first irradiation field and offset by a quarter or a half of the resolution.
• the radiation source and the collimator can be rotatably mounted about an axis of rotation about an isocenter, and the irradiation fields can be offset from one another along the axis of rotation.
• the rotation of the radiation source and of the collimator can take place helically around the axis of rotation.
• the radiation source and the collimator can to have a Rotati ⁇ onsachse rotatably supported, wherein a resolution of the irradiation field in a direction perpendicular to the axis of rotation is defined by the extension of the collimator, and the offset perpendicularly saufin ⁇ det to the rotation axis.
• the field applied by the collimator may be arranged to an isocentrically aligned radius such that the field is offset from the radius by a quarter of the resolution of the irradiation field.
• Fig. 2 is a representation of how the resolution increase in a
• Radiotherapy device can be achieved.
• Fig. 3 is a representation of how the resolution increase in a
• Radiotherapy device according to another embodiment ⁇ form can be achieved.
• FIG. 4 shows the offset of the irradiation field in FIG.
• Fig. 3 illustrated embodiment with respect to a central, isocentric radius.
• Fig. 1 shows a first irradiation field 11 and a Questionla ⁇ GERTES second irradiation field 13.
• the first irradiation ⁇ field 11 is shown by a solid line, the second irradiation field 13 by a broken line.
• the first irradiation field 11 is applied in the irradiation volume by applying a beam from a first direction and limited by a collimator.
• the width of the collimator - for example lamellae - is the on ⁇ solution of the first irradiation field 11 adjacent loading in one direction.
• the irradiation of the second irradiation field 13 takes place from the opposite spatial direction, specifically in such a way that the second irradiation field 13 is offset in the direction in which the resolution limitation is predetermined by the collimator design. Shown here is an offset by half the resolution, other fractions than offset are possible.
• Fig. 2 shows a radiotherapy device 21, in which a
• Radiation source 23 and a collimator 25 can be rotated about an axis of rotation 27. Other components of the Strahlenthera ⁇ pie réelles 21 are not shown for clarity.
• the rotation of the radiation source 23 and of the collimator 25 about the target volume (not shown) to be irradiated takes place along a helical path 29.
• the path 29 is selected such that upon irradiation of the irradiation fields 11, 13 from different directions, an offset of the irradiation fields 11, 13 exactly by half by the collimator 25 predetermined resolution takes place.
• the displacement device the fields provides the displacement of the irradiation, the mechanism that allows the helical Bahnbewe ⁇ supply of the radiation source 23 and the collimator 25 corresponds.
• Fig. 3 shows a radiotherapy device 21, in which a
• Radiation source 23 and a collimator 25 can be rotated about an axis of rotation 27.
• Other components of the Strahlenthera ⁇ pie réelles 21 are not shown for clarity.
• the rotation of the radiation source 23 and of the collimator 25 about the target volume to be irradiated takes place along a circular path 29 '.
• the irradiation of the radiation fields 11, 13 is chosen such that follows at a ⁇ radiation of the radiation fields 11, 13 from different directions, a displacement of the radiation fields 11, 13 ER- exactly in half by the collimator 25 predetermined resolution.
• the offset takes place along a direction which is perpendicular to the axis of rotation 27.
• the offset device that provides for the displacement of the irradiation fields corresponds to the mechanism that allows the irradiation of a field by a quarter of the resolution offset to an isocentric, imaginary radius 31.

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• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Radiology & Medical Imaging (AREA)
• Pathology (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Radiation-Therapy Devices (AREA)
• Apparatus For Radiation Diagnosis (AREA)

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Cited By (4)

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• 2010
  • 2010-02-24 DE DE102010009018A patent/DE102010009018A1/de not_active Withdrawn
• 2011
  • 2011-02-02 BR BR112012021176A patent/BR112012021176A2/pt not_active Application Discontinuation
  • 2011-02-02 CN CN2011800112016A patent/CN102762257A/zh active Pending
  • 2011-02-02 WO PCT/EP2011/051460 patent/WO2011104076A1/de active Application Filing
  • 2011-02-02 RU RU2012140348/14A patent/RU2012140348A/ru unknown
  • 2011-02-02 CA CA2790793A patent/CA2790793A1/en not_active Abandoned
  • 2011-02-02 JP JP2012554265A patent/JP2013520256A/ja active Pending
  • 2011-02-02 US US13/579,914 patent/US20120314840A1/en not_active Abandoned
  • 2011-02-02 EP EP11702975A patent/EP2516006A1/de not_active Withdrawn
• 2012
  • 2012-07-27 IN IN6647DEN2012 patent/IN2012DN06647A/en unknown

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