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<p>This study introduces a novel integrated quality assurance (QA) phantom designed to enhance the efficiency, accuracy, and reproducibility of routine QA procedures for linear accelerators (LINACs), as recommended by task group (TG)-142. The phantom provides an independent method for verifying the radiation isocenter and other QA parameters, addressing the limitations of manufacturer-provided systems. It integrates multiple QA tasks into a single device, including Winston–Lutz testing, mechanical checks, and dosimetric measurements. The system’s time efficiency was evaluated by comparing setup and test durations with conventional methods, referencing TG-198, while isocenter verification accuracy was assessed through comparisons with manufacturer-provided systems and film-based Starshot tests. The results demonstrated significant time savings, reducing setup time by approximately 42% (from 12 to 7&#xa0;min) and Winston–Lutz test duration by approximately 55% (from 29 to 13&#xa0;min) compared to conventional manual methods. Isocenter verification with the phantom consistently measured deviations within 0.6&#xa0;mm over a 12-month period, remaining well within the clinically acceptable tolerance and consistent with the estimated uncertainty of 0.56&#xa0;mm. These findings suggest that the integrated QA phantom offers an efficient, accurate, and reproducible solution for LINAC QA, enabling more frequent and consistent verification while minimizing operator dependency and equipment transitions. Its performance and uncertainty are comparable to established manufacturer-provided systems, positioning it as a reliable tool to enhance patient safety in radiotherapy.</p>

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Development of an integrated phantom for isocenter verification and quality assurance in linear accelerators

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Jeong-Eun Rah,
  • Young Kyung Lim,
  • Sang-Hyun Choi,
  • Ui-Jung Hwang,
  • Ki-Hwan Kim

摘要

This study introduces a novel integrated quality assurance (QA) phantom designed to enhance the efficiency, accuracy, and reproducibility of routine QA procedures for linear accelerators (LINACs), as recommended by task group (TG)-142. The phantom provides an independent method for verifying the radiation isocenter and other QA parameters, addressing the limitations of manufacturer-provided systems. It integrates multiple QA tasks into a single device, including Winston–Lutz testing, mechanical checks, and dosimetric measurements. The system’s time efficiency was evaluated by comparing setup and test durations with conventional methods, referencing TG-198, while isocenter verification accuracy was assessed through comparisons with manufacturer-provided systems and film-based Starshot tests. The results demonstrated significant time savings, reducing setup time by approximately 42% (from 12 to 7 min) and Winston–Lutz test duration by approximately 55% (from 29 to 13 min) compared to conventional manual methods. Isocenter verification with the phantom consistently measured deviations within 0.6 mm over a 12-month period, remaining well within the clinically acceptable tolerance and consistent with the estimated uncertainty of 0.56 mm. These findings suggest that the integrated QA phantom offers an efficient, accurate, and reproducible solution for LINAC QA, enabling more frequent and consistent verification while minimizing operator dependency and equipment transitions. Its performance and uncertainty are comparable to established manufacturer-provided systems, positioning it as a reliable tool to enhance patient safety in radiotherapy.