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Statistical process control for electron beam monitoring
Juan López-Tarjuelo1, Naika Luquero-Llopis2, Rafael García-Mollá1
1Servicio de Radiofísica y Protección Radiológica, Consorcio Hospitalario Provincial de Castellón, Avda. Dr. Clará 19, Castellón de la Plana 12002, Castellón, Spain.
Statistical process control (SPC) can assess electron beam variability in linear accelerators (linacs). While effective for quality control, practical implementation requires direct feedback integration for linac adjustments.
Area of Science:
- Medical Physics
- Quality Control
- Statistical Analysis
Background:
- Daily quality control of linear accelerators (linacs) is crucial for patient safety and treatment efficacy.
- Statistical Process Control (SPC) offers a framework for monitoring and improving process stability.
Purpose of the Study:
- To evaluate the feasibility of applying Statistical Process Control (SPC) to linear accelerator (linac) electron beam monitoring.
- To assess the long-term performance of linac quality control using historical data and simulated SPC conditions.
Main Methods:
- Retrospective analysis of daily linac beam calibration, symmetry, and flatness records (2008-2013) for all electron beam energies.
- Simulation of SPC application and adjustment interventions to assess process capability and control.
Main Results:
- Phase I data indicated that the electron beam monitoring system was generally under statistical control.
- Process capability ratios ranged from 1.6 to 9.3 at a 2% specification level, demonstrating good control.
- Simulated interventions showed that prospective SPC application would have met quality control specifications.
Conclusions:
- SPC effectively assesses inherent variability in electron beam monitoring systems.
- Daily SPC monitoring can indicate process capability for maintaining electron beam parameters within specifications.
- Practical implementation of SPC for linac quality control necessitates a direct feedback mechanism to the linac.
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