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Implementation and Evaluation of WS531-2017 "Specification for Testing of Quality Control in Helical Tomotherapy Unit"

Received: 17 March 2019     Accepted: 26 April 2019     Published: 15 May 2019
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Abstract

Objective: To perform an annual test on the system stability of the first helical tomotherapy unit (Tomotherapy, TOMO) in Zhejiang province according to WS531-2017 "specification for testing of quality control in helical tomotherapy unit", and to further standardize the quality control operation, understand the properties of the system and ensure the accurate implementation of clinical radiotherapy. Methods: According to the requirements of WS531-2017, 8-channel measurement instrument (TomoElectrometer), ionization chamber A1SL (Standing Imaging, USA) and A17 (Standing Imaging, USA), cylindrical phantom (Cheese Phantom), equivalent rectangular solid water, two-dimensional water tank, EBT3 film, and Vidar film analyzer were used to detect 10 key indicators of TOMO. Results: The static output dose deviation was -0.6%, and the rotational output dose deviation was 1.4%. The difference between radiation quality and planned value was 0.8%. The symmetry of the horizontal dose curve of the radiation field was -1.2%; and the full width at half-maximum deviation of the longitudinal dose curve of the radiation field was 0.7mm. The horizontal offset of multi-leaf collimator was -0.6mm. The green laser offset in axial plane, sagittal plane and coronal plane were 0.08mm, 0.2mm and 0.2mm to the of virtual isocenter. The red laser light offset was -0.4mm. The movement deviation of the treatment bed was 0.3mm; and the synchronous deviation of the rotation of the treatment bed and frame was -0.6mm. Conclusion: All 10 key indicators of TOMO meet the requirement of WS531-2017. Some necessary testing items, such as MVCT image quality verification, should be added to the annual TOMO quality control in order to ensure the good stability and normal working of system.

Published in International Journal of Clinical and Experimental Medical Sciences (Volume 5, Issue 1)
DOI 10.11648/j.ijcems.20190501.14
Page(s) 14-18
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Helical Tomotherapy Unit, Quality Assurance, Radiotherapy Dose, Deviation

References
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[7] Langen K M, Papanikolaou N, Balog J, et al. QA for helical tomotherapy: Report of the AAPM Task Group 148a [J]. Medical Physics, 2010, 37(9): 4817-4853.
[8] Jeraj R, Mackie T R, Balog J, et al. Dose calibration of nonconventional treatment systems applied to helical tomotherapy [J]. Medical Physics, 2005, 32(2): 570-577.
[9] Kapatoes J M, Olivera G H, Ruchala K J, et al. A feasible method for clinical delivery verification and dose reconstruction in tomotherapy [J]. Medical Physics, 2001, 28(4): 528-542.
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    Cheng Xiaolong, Liu Jiping, Shi Jianfang. (2019). Implementation and Evaluation of WS531-2017 "Specification for Testing of Quality Control in Helical Tomotherapy Unit". International Journal of Clinical and Experimental Medical Sciences, 5(1), 14-18. https://doi.org/10.11648/j.ijcems.20190501.14

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    ACS Style

    Cheng Xiaolong; Liu Jiping; Shi Jianfang. Implementation and Evaluation of WS531-2017 "Specification for Testing of Quality Control in Helical Tomotherapy Unit". Int. J. Clin. Exp. Med. Sci. 2019, 5(1), 14-18. doi: 10.11648/j.ijcems.20190501.14

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    AMA Style

    Cheng Xiaolong, Liu Jiping, Shi Jianfang. Implementation and Evaluation of WS531-2017 "Specification for Testing of Quality Control in Helical Tomotherapy Unit". Int J Clin Exp Med Sci. 2019;5(1):14-18. doi: 10.11648/j.ijcems.20190501.14

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  • @article{10.11648/j.ijcems.20190501.14,
      author = {Cheng Xiaolong and Liu Jiping and Shi Jianfang},
      title = {Implementation and Evaluation of WS531-2017 "Specification for Testing of Quality Control in Helical Tomotherapy Unit"},
      journal = {International Journal of Clinical and Experimental Medical Sciences},
      volume = {5},
      number = {1},
      pages = {14-18},
      doi = {10.11648/j.ijcems.20190501.14},
      url = {https://doi.org/10.11648/j.ijcems.20190501.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijcems.20190501.14},
      abstract = {Objective: To perform an annual test on the system stability of the first helical tomotherapy unit (Tomotherapy, TOMO) in Zhejiang province according to WS531-2017 "specification for testing of quality control in helical tomotherapy unit", and to further standardize the quality control operation, understand the properties of the system and ensure the accurate implementation of clinical radiotherapy. Methods: According to the requirements of WS531-2017, 8-channel measurement instrument (TomoElectrometer), ionization chamber A1SL (Standing Imaging, USA) and A17 (Standing Imaging, USA), cylindrical phantom (Cheese Phantom), equivalent rectangular solid water, two-dimensional water tank, EBT3 film, and Vidar film analyzer were used to detect 10 key indicators of TOMO. Results: The static output dose deviation was -0.6%, and the rotational output dose deviation was 1.4%. The difference between radiation quality and planned value was 0.8%. The symmetry of the horizontal dose curve of the radiation field was -1.2%; and the full width at half-maximum deviation of the longitudinal dose curve of the radiation field was 0.7mm. The horizontal offset of multi-leaf collimator was -0.6mm. The green laser offset in axial plane, sagittal plane and coronal plane were 0.08mm, 0.2mm and 0.2mm to the of virtual isocenter. The red laser light offset was -0.4mm. The movement deviation of the treatment bed was 0.3mm; and the synchronous deviation of the rotation of the treatment bed and frame was -0.6mm. Conclusion: All 10 key indicators of TOMO meet the requirement of WS531-2017. Some necessary testing items, such as MVCT image quality verification, should be added to the annual TOMO quality control in order to ensure the good stability and normal working of system.},
     year = {2019}
    }
    

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  • TY  - JOUR
    T1  - Implementation and Evaluation of WS531-2017 "Specification for Testing of Quality Control in Helical Tomotherapy Unit"
    AU  - Cheng Xiaolong
    AU  - Liu Jiping
    AU  - Shi Jianfang
    Y1  - 2019/05/15
    PY  - 2019
    N1  - https://doi.org/10.11648/j.ijcems.20190501.14
    DO  - 10.11648/j.ijcems.20190501.14
    T2  - International Journal of Clinical and Experimental Medical Sciences
    JF  - International Journal of Clinical and Experimental Medical Sciences
    JO  - International Journal of Clinical and Experimental Medical Sciences
    SP  - 14
    EP  - 18
    PB  - Science Publishing Group
    SN  - 2469-8032
    UR  - https://doi.org/10.11648/j.ijcems.20190501.14
    AB  - Objective: To perform an annual test on the system stability of the first helical tomotherapy unit (Tomotherapy, TOMO) in Zhejiang province according to WS531-2017 "specification for testing of quality control in helical tomotherapy unit", and to further standardize the quality control operation, understand the properties of the system and ensure the accurate implementation of clinical radiotherapy. Methods: According to the requirements of WS531-2017, 8-channel measurement instrument (TomoElectrometer), ionization chamber A1SL (Standing Imaging, USA) and A17 (Standing Imaging, USA), cylindrical phantom (Cheese Phantom), equivalent rectangular solid water, two-dimensional water tank, EBT3 film, and Vidar film analyzer were used to detect 10 key indicators of TOMO. Results: The static output dose deviation was -0.6%, and the rotational output dose deviation was 1.4%. The difference between radiation quality and planned value was 0.8%. The symmetry of the horizontal dose curve of the radiation field was -1.2%; and the full width at half-maximum deviation of the longitudinal dose curve of the radiation field was 0.7mm. The horizontal offset of multi-leaf collimator was -0.6mm. The green laser offset in axial plane, sagittal plane and coronal plane were 0.08mm, 0.2mm and 0.2mm to the of virtual isocenter. The red laser light offset was -0.4mm. The movement deviation of the treatment bed was 0.3mm; and the synchronous deviation of the rotation of the treatment bed and frame was -0.6mm. Conclusion: All 10 key indicators of TOMO meet the requirement of WS531-2017. Some necessary testing items, such as MVCT image quality verification, should be added to the annual TOMO quality control in order to ensure the good stability and normal working of system.
    VL  - 5
    IS  - 1
    ER  - 

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Author Information
  • Department of Radiation Physics, Zhejiang Cancer Hospital, Hangzhou, China

  • Department of Radiation Physics, Zhejiang Cancer Hospital, Hangzhou, China

  • Department of Radiation Physics, Zhejiang Cancer Hospital, Hangzhou, China

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