Charged Particle Beam Control for Gating Irrigation
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Solution Overview
Problem
Conventional charged particle irradiation systems face inefficiencies and prolonged treatment times due to irregular patient respiration cycles, leading to extended irradiation times when the target deviates from the extraction permission area and quickly returns.
Innovation Solution
A charged particle irradiation system with a control system that maintains the extractable state of the charged particle beam generator after the extraction permission state ends, allowing for immediate re-extraction when the target returns to the permission area, and decelerating only after a preset standby time or when the target moves out of the permitted range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charged particle beam generator starts deceleration immediately when the target deviates from the extraction permission area, then the extraction permission state can be strictly maintained, but the beam extraction cannot be performed when the target returns to the extraction permission area after short-term deviation, extending the total irradiation time
Solution Approach 1:
The control system maintains the extractable state of the charged particle beam generator in advance after the extraction permission state ends, so that when the target returns to the extraction permission area, the beam can be extracted immediately without waiting for deceleration to complete. This preliminary maintenance of the extractable state resolves the contradiction by allowing both strict state maintenance and rapid re-extraction.
2Productivity
If the charged particle beam generator maintains extractable state continuously, then the irradiation efficiency can be improved, but the deceleration process may be delayed
Solution Approach 1:
The control system dynamically adjusts the extractable state maintenance based on the extraction permission state. When the target is within the extraction permission area, the system maintains the extractable state to enable immediate extraction. When the target deviates, the system allows deceleration to proceed. This dynamic adjustment resolves the contradiction by making the extractable state maintenance flexible rather than continuous.
3Manufacturing precision
If the extraction permission state is strictly enforced, then the gating irradiation accuracy is maintained, but the treatment time increases due to inability to extract beam during short-term deviations
Solution Approach 1:
The control system performs preliminary maintenance of the extractable state after the extraction permission state ends, enabling the beam to be extracted immediately when the target returns to the permission area. This preliminary action allows the system to maintain gating irradiation accuracy while reducing treatment time by avoiding unnecessary delays.
Data Source
AI summary
A charged particle irradiation system is capable of shortening the irradiation time and the treatment time by performing efficient irradiation even when irregular variation occurs in the irradiation object during the gating irradiation. The extraction of the beam is stopped upon reception of a regular extraction permission end signal which is outputted based on a regular movement signal. An extractable state maintaining function operates upon the reception of the extraction permission end signal. When a preset standby time elapses without receiving an extraction permission start signal again during the standby time, the extractable state maintaining function finishes its operation and a charged particle beam generator decelerates the beam. Also, the extraction of the beam is stopped due to reception of an irregular extraction permission end signal during the irradiation. When the extraction permission start signal is received again during the standby time, the extraction of the beam is restarted.