Evaluation of multi-leaf collimator accuracy in Halcyon system using logfile analysis

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-03-21 DOI:10.1016/j.radphyschem.2025.112741

Nguyen Khac Son, Luong Tien Phat, Ha Anh Tu, Ngo Hoang Long, Duong Thanh Tai, Paul Booker, Sitti Yani, Abdelmoneim Sulieman, Nissren Tamam, Peter Sandwall, James C.L. Chow

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引用次数: 0

Abstract

This study evaluates multi-leaf collimator (MLC) positioning accuracy in the Halcyon linear accelerator using logfile analysis across head and neck, thoracic, and pelvic regions. Logfiles from 1282 fractions (366 head and neck, 524 thoracic, 392 pelvic) were analyzed for real-time versus planned MLC positions and monitor unit (MU) discrepancies, assessing root mean square (RMS) errors and deviations within ±0.35 cm per AAPM TG-142 and TG-198 guidelines. RMS errors were low across all regions, with head and neck showing the highest variations due to modulation complexity, thoracic the widest deviations from respiratory motion, and pelvic the most stable. Over 95 % of MLC deviations were within 0.35 cm, and delivered MUs were slightly higher than planned but within QA limits. The findings demonstrate that the Halcyon system consistently meets stringent QA standards for MLC positioning accuracy and dose delivery across different anatomical regions. Logfile analysis provides a reliable, non-invasive, and automated QA method for real-time assessment of MLC performance, enhancing the overall quality and safety of radiotherapy treatments.

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.