Particle Therapy Scanning Magnet Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current particle therapy systems face challenges in accurately and efficiently scanning and delivering doses of charged particles across irradiation targets, particularly in ensuring uniform coverage and precise dose delivery, due to limitations in beam control and synchronization with the RF cycle.
Innovation Solution
The system incorporates a scanning magnet controlled by a current that allows uninterrupted movement of the particle beam, a control system for precise dose delivery, and an energy degrader to adjust the beam's energy, enabling synchronized dose measurement and compensation to achieve target cumulative doses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the beam is scanned across the irradiation target using conventional particle therapy systems, then dose delivery is achieved, but uniform coverage and precise dose delivery are compromised due to limitations in beam control and synchronization with the RF cycle
Solution Approach 1:
The control system continuously monitors the actual beam position and delivered dose, comparing it against the treatment plan requirements. Based on this feedback, the system dynamically adjusts the scanning magnet current to correct deviations and ensure precise dose delivery to each position, resolving the contradiction between precision and system complexity by implementing intelligent control rather than purely mechanical precision
Solution Approach 2:
The system employs dynamic beam control where the scanning magnet current is continuously adjusted during the scanning process rather than using fixed predetermined paths. This allows the beam to adapt its trajectory in real-time to achieve uniform coverage and precise dose delivery, transforming a static scanning approach into a dynamic one that can compensate for variations and maintain precision
2Area of stationary object
If the scanning system moves the beam across the irradiation target, then coverage of various parts is achieved, but uninterrupted movement and uniform coverage are difficult to maintain
Solution Approach 1:
The control system monitors the cumulative dose delivered at each position and compares it to the target cumulative dose. When deviations are detected, the system adjusts the beam scanning trajectory and dwell time to compensate, ensuring uniform dose distribution across the entire irradiation target area while maintaining uninterrupted beam movement
Solution Approach 2:
The system maintains continuous beam scanning across the irradiation target without interruption, using real-time control adjustments to ensure uniform coverage. By keeping the beam in continuous motion and dynamically adjusting parameters rather than using intermittent or stepped scanning, the system achieves both complete area coverage and reliable uniform dose distribution
3Measurement precision
If the control system adjusts the scanning magnet current to deliver precise doses, then dose accuracy is improved, but the complexity of synchronization and control increases
Solution Approach 1:
The control system implements closed-loop feedback by continuously measuring the cumulative dose at each position and comparing it to the treatment plan specifications. Based on this measurement, the system automatically adjusts the scanning magnet current to correct any deviations, achieving precise dose measurement and delivery while managing control complexity through automated feedback control rather than manual adjustment
Solution Approach 2:
The control system performs self-adjustment by automatically modifying the scanning magnet current based on real-time dose measurements and treatment plan requirements. This self-service capability allows the system to maintain precise dose accuracy without requiring external intervention or overly complex external control mechanisms, as the system autonomously corrects its own performance
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 ensures accurate and efficient scanning and dose delivery, allowing for precise control over the particle beam's movement and energy, thereby enhancing the effectiveness of particle therapy by ensuring uniform irradiation and precise dose distribution.
Implementation Method 1
a scanning magnet to move the beam during scanning, where a position of the beam corresponds to a current of the scanning magnet
Implementation Method 2
particles are accelerated in orbits inside a cavity in the presence of a magnetic field
Implementation Method 3
A magnetic field regenerator generates a magnetic field bump near the outside of the cavity to distort the pitch and angle of some orbits so that they precess towards, and eventually into, the extraction channel
Data Source
AI summary
An example particle therapy system includes: a particle accelerator to output a beam of charged particles; and a scanning system to scan the beam across at least part of an irradiation target. An example scanning system includes: a scanning magnet to move the beam during scanning; and a control system (i) to control the scanning magnet to produce uninterrupted movement of the beam over at least part of a depth-wise layer of the irradiation target so as to deliver doses of charged particles to the irradiation target; and (ii) to determine, in synchronism with delivery of a dose, information identifying the dose actually delivered at different positions along the depth-wise layer.