ArticleJournal of applied clinical medical physics2025
Long-term stability analysis of beam shape in a robotic radiosurgery system.
Article in Journal of applied clinical medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Long-term stability analysis of beam shape in a robotic radiosurgery system.Journal of applied clinical medical physics · 2025Article
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThis study aimed to investigate the long-term stability of CyberKnife beam profile parameters and assess their compliance with existing quality assurance (QA) guidelines. We evaluated beam profiles in both standard and diagonal planes over 3.5 years post-installation to detect potential issues and ensure consistent beam quality. The findings will contribute to validating and refining current QA practices for CyberKnife systems.
methodsBeam profile measurements were performed monthly using an Octavius 1000SRS detector array. The profiles were evaluated in terms of the beam shape constancy within 2%, and the penumbra, symmetry, and flatness were analyzed using statistical process control methods. Temporal changes in the dose profiles were visualized using dose difference heat maps. The relationship between the beam parameters and accumulated monitor units was also investigated.
resultsThe 2% profile constancy check accurately detected magnetron deterioration 2 months before failure, confirming its high sensitivity for beam stability monitoring. While symmetry and flatness remained within 0.7% throughout over 100 × 10
conclusionsThese findings reinforce the effectiveness of the 2% profile constancy check for early detection of magnetron failure and support its adoption in current CyberKnife guidelines. At the same time, symmetry, flatness, and penumbra parameters remain valuable for characterizing gradual profile variations. Collectively, this study underscores the need for comprehensive beam monitoring and regular maintenance to sustain optimal CyberKnife system performance.
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