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  • [J Appl Clin Med Phys.] Assessment of log-based fingerprinting system of Mobius3D with Elekta linear accelerators

    [J Appl Clin Med Phys.] Assessment of log-based fingerprinting system of Mobius3D with Elekta linear accelerators

    연세의대, 가톨릭의대 / 노유윤, 한민철*, 서태석*

  • 출처
    J Appl Clin Med Phys.
  • 등재일
    2022 Feb
  • 저널이슈번호
    23(2):e13480. doi: 10.1002/acm2.13480. Epub 2021 Nov 27.
  • 내용

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    Abstract
    Purpose: The purpose of this study was to investigate the matching error that occurs when the Mobius3D fingerprinting system is applied in conjunction with an Elekta linear accelerator (LINAC) and to offer an acceptable and alternative method for circumventing this problem.

    Material and methods: To avoid the multileaf collimator (MLC) conflicting error in the Mobius3D fingerprinting system, we developed an in-house program to move the MLC in the Digital Imaging and Communications in Medicine (DICOM) radiotherapy (RT)-Plan to pertinent positions, considering the relationship between log data and planned data. The re-delivered log files were calculated in the Mobius3D system, and the results were compared with those of corrected data (i.e., we analyzed a pair of re-collected log data and the previous DICOM RT-Plan data). The results were then evaluated by comparing several items, such as point dose errors, gamma index (GI) passing rates, and MLC root-mean-square (RMS) values.

    Results: For the point dose error, the maximum difference found was below 2.0%. In the case of GI analysis of all plans, the maximum difference in the passing rates was below 1.4%. The statistical results obtained using a paired Student's t-test showed that there were no significant differences within the uncertainty. In the case of the RMS test, the maximum difference found was approximately 0.08 mm.

    Conclusions: Our results showed that all the mismatched log files were sufficiently acceptable within the uncertainty. We conclude that the matching error obtained when applying Mobius3D to an Elekta LINAC may be addressed using a simple modification of the fingerprinting system, and we expect that our study findings will help vendors resolve this issue in the near future.

     

     

    Affiliations

    Yu-Yun Noh  1   2 , Jihun Kim  3 , Jin Sung Kim  3 , Han-Back Shin  2 , Min Cheol Han  3 , Tae Suk Suh  1
    1 Department of Biomedical Engineering and Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, South Korea.
    2 Department of Radiation Oncology, Yonsei Cancer Center, College of Medicine, Yonsei University, Seoul, South Korea.
    3 Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, South Korea.

  • 키워드
    Elekta LINAC; Mobius3D; matching error; patient-specific QA.
  • 연구소개
    Intensity Modulated Radiation Therapy (IMRT)의 Patient specific quality assurance (QA)를 위해 사용되는 로그 기반 시스템인 Mobius3D 와 Elekta linac에서 발생 되는 MLC conflicting error의 매칭 오류의 원인을 파악하고 발생할 수 있는 상황을 가정하여 정량적인 분석을 수행하였으며, 이후 현 문제의 개선 방향에 대한 해결 방안을 제시하는 논문입니다.
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