Particle Beam Irradiation System Intensity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing particle beam therapy systems face challenges in accurately controlling the intensity of ion beams extracted from synchrotrons, leading to complexities in device configuration and difficulty in achieving desired intensity control for precise cancer treatment.
Innovation Solution
A particle beam irradiation system incorporating a synchrotron with first and second beam intensity modulation means, along with a rotatable energy moderator, allows for precise control of beam intensity during extraction and irradiation periods, using amplitude modulation of radiofrequency signals to match the accumulated ion beam intensity and rotation angle of the energy moderator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam intensity control is achieved by adjusting radiofrequency signal amplitude during extraction, then beam intensity control accuracy is improved, but device complexity increases due to additional modulation means
Solution Approach 1:
The patent replaces mechanical beam intensity control methods with radiofrequency signal amplitude modulation. Instead of using mechanical apertures or physical beam manipulation, the system controls beam intensity by electronically modulating the amplitude of radiofrequency signals applied during extraction, thereby improving control accuracy while avoiding additional mechanical complexity
Solution Approach 2:
The patent changes the operational parameter from fixed extraction timing to dynamic radiofrequency signal amplitude modulation. By varying the amplitude of radiofrequency signals during the extraction period based on accumulated beam intensity, the system achieves precise beam intensity control without requiring complex mechanical adjustment mechanisms
2Quantity of substance
If extraction control time is extended to maximize accumulated beam intensity, then beam intensity is improved, but beam intensity stability deteriorates due to synchrotron operation cycle variations
Solution Approach 1:
The patent implements feedback control by monitoring the accumulated beam intensity in the synchrotron and using this information to adjust the amplitude of radiofrequency signals during extraction. The beam intensity modulation means receives signals indicating accumulated intensity and dynamically adjusts extraction parameters to maintain stable beam intensity despite variations in accumulation time
Solution Approach 2:
The patent introduces dynamic adjustment of radiofrequency signal amplitude during the extraction period. Instead of using a fixed extraction scheme, the system dynamically modulates the radiofrequency signal amplitude based on real-time beam intensity conditions, allowing optimal extraction control that adapts to varying accumulation scenarios
3Manufacturing precision
If rotatable energy moderator is used to shape beam energy distribution, then energy distribution precision is improved, but device complexity increases due to additional rotation and modulation mechanisms
Solution Approach 1:
The patent makes the rotatable energy moderator serve multiple functions: it both shapes the beam energy distribution and, through its rotation angle control, modulates the beam intensity. This multi-functionality allows the single component to achieve both energy distribution precision and intensity control without requiring separate dedicated mechanisms for each function
Solution Approach 2:
The patent combines the energy modulation function and intensity modulation function into a single integrated system. The rotatable energy moderator is coupled with the beam intensity modulation means such that one component performs dual functions, merging what would traditionally require separate devices into a unified mechanism
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate control of outgoing beam intensity and ensures precise delivery of ion beams to the radiation target, enhancing the precision and safety of particle beam therapy.
Implementation Method 1
The radiofrequency acceleration system applies a radiofrequency voltage to the ion beam, which moves in a circular path, to accelerate the ion beam to a target energy
Implementation Method 2
The extraction radiofrequency electrode increases the betatron oscillation amplitude of the ion beam, which moves in a circular path
Implementation Method 3
amplitude modulation means for modulating an amplitude of the radiofrequency signal to be applied to the extraction radiofrequency electrode
Implementation Method 4
rotatable energy moderator, allows for precise control of beam intensity during extraction and irradiation periods, using amplitude modulation of radiofrequency signals to match the accumulated ion beam intensity and rotation angle of the energy moderator
Data Source
AI summary
It is an object of the present invention to provide a charged particle beam extraction method and particle beam irradiation system that make it possible to exercise intensity control over an extracted ion beam while a simple device configuration is employed. To accomplish the above object, there is provided a particle beam irradiation system comprising: a synchrotron for accelerating and extracting an charged particle beam; an irradiation apparatus for extracting the charged particle beam that is extracted from the synchrotron; first beam intensity modulation means for controlling the beam intensity of the charged particle beam extracted from the synchrotron during an extraction control period of an operation cycle of the synchrotron; and second beam intensity modulation means for controlling the beam intensity during each of a plurality of irradiation periods contained in the extraction control period of the operation cycle.