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Multilear collimator, particle beam therapy device and therapy planning device

A multi-leaf collimator, particle beam technology, applied in X-ray/γ-ray/particle irradiation therapy, therapy, radiotherapy, etc., can solve the problem of dose attenuation of charged particle beams

Inactive Publication Date: 2015-07-15
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of linearly driving the vane plate, a charged particle beam at an angle to the diffusion direction is irradiated to a part of the end face of the vane plate at a contour portion away from the center of the irradiation field, resulting in continuous occurrence of dose of the charged particle beam. Sexual attenuation, which produces the so-called penumbra

Method used

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  • Multilear collimator, particle beam therapy device and therapy planning device
  • Multilear collimator, particle beam therapy device and therapy planning device
  • Multilear collimator, particle beam therapy device and therapy planning device

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Embodiment approach 1

[0030] Next, configurations of the multileaf collimator and the particle beam therapy apparatus according to Embodiment 1 of the present invention will be described. Figure 1 to Figure 5 It is a figure for demonstrating the structure of the multileaf collimator and particle beam therapy apparatus concerning Embodiment 1 of this invention, figure 1 It is a figure showing the structure of the irradiation system of the particle beam therapy apparatus including a multi-leaf collimator, figure 2 In order to show the structure of the particle beam therapy device and the multi-leaf collimator from figure 1 In the diagram observed in the direction perpendicular to the center (z-direction) of the charged particle beam, figure 2 (a) is a side view viewed from the y direction, figure 2 (b) is a side view seen from the x direction. image 3 It is a figure for explaining the shape of the beam in the irradiation system of the particle beam irradiation apparatus, image 3 (a) A diagra...

Embodiment approach 2

[0057] In Embodiment 1, the application of the helical wobble method of scanning the beam in a helical shape was explained. However, the shape of the scanning trajectory (scanning trajectory) of the beam in the irradiation field is not limited to the technical idea of ​​the present invention, and the effect of two-stage scanning diffusion can also be exhibited in other beam scanning trajectory. Therefore, in Embodiment 2, the case will be explained by applying the multileaf collimator of the present invention to an irradiation system having another typical beam scanning trajectory.

[0058] First, the beam scanning trajectory obtained by the helical wobble method used in Embodiment 1 will be described. As described in Patent Document 3, the spiral scanning trajectory is obtained by Equation (1) including the following three equations.

[0059] (mathematical formula 1)

[0060] r ( t ) = ...

Embodiment approach 3

[0087] In Embodiments 1 and 2 above, the case where irradiation is performed using the swing method has been described. However, as described above, the irradiation method itself is not an essential part of the present invention, nor does it limit the technical idea of ​​the present invention. In a particle beam therapy apparatus, a spot scanning method has been proposed which scans a charged particle beam using a two-stage scanning electromagnet and performs spot irradiation on an irradiated object in a point drawing manner. In the case of spot scanning, the spread of the beam is also two-stage scanning. Therefore, even when a multi-leaf collimator is used for spot scanning, the effect of suppressing the above-mentioned penumbra and forming an irradiation field with high contrast can be exhibited.

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Abstract

The objective thereof is to obtain a multi-leaf collimator and a particle beam therapy system in which a high-contrast irradiation field can be formed without undergoing the effect of a penumbra. There are provided a leaf row (5 C ) in which a plurality of leaf plates (5 L ) are arranged in the thickness direction of the row (5 C ) in such a way that the respective one end faces (E L ) of the leaf plates (5 L ) are trued up and a leaf plate drive mechanism (5 D ) that drives each of the plurality of leaf plates (5 L ) in such a way that the one end face (E L ) approaches or departs from a beam axis (X B ). In each of the leaf plates (5 L ), a facing side (PL) facing a leaf plate that is adjacent to that leaf plate in the thickness direction is formed of a plane (P sa ) including a first axis (A sa ) on the beam axis (X B ); the leaf plate drive mechanism (5 D ) drives the leaf plate (5 L ) along a circumferential orbit (O L ) around the second axis (A sb ), on the beam axis (X B ), that is perpendicular to the beam axis (X B ) and the first axis (A sa ).

Description

technical field [0001] The present invention relates to a multi-leaf collimator, a particle beam therapy device using the multi-leaf collimator, and a treatment planning device for determining the operating conditions of the particle beam therapy device, and the multi-leaf collimator is suitable for using charged particle beams An irradiation field is formed in a particle beam therapy device. Background technique [0002] Particle beam therapy is a method of treatment by irradiating charged particle beams to the affected area as the treatment target to destroy the affected tissue. A particle beam therapy device that accurately controls the irradiation dose and the irradiation range (hereinafter referred to as the irradiation field). Among the particle beam therapy devices, in a so-called wide-area irradiation type particle beam therapy device that uses an irradiation nozzle including a scanning electromagnet such as a swing electromagnet, the irradiation field is enlarged b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61N5/10
CPCA61N5/1043A61N2005/1096A61N2005/1087G21K1/046A61N2005/1095A61N5/1042A61N5/103A61N5/1045
Inventor 岩田高明
Owner MITSUBISHI ELECTRIC CORP
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