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Dose calculation of 3D printing lead shield covered by biocompatible silicone for electron beam therapy

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Abstract

This study aims to calculate the dose delivered to the upstream surface of a biocompatible flexible absorber covering lead for electron beam treatment of skin and subcutaneous tumour lesions for head and neck. Silicone (Ecoflex™ 00–30, Smooth-On, Easton, PA, USA) was used to cover the lead to absorb backscattered electrons from lead. A 3D printer (Zortrax M300, Zortrax, Olsztyn, Poland) was used to fabricate the lead shield. Analytic calculation, simplified Monte Carlo (MC) simulation, and detailed MC simulation which includes a modeling of metal–oxide–semiconductor field-effect transistor (MOSFET) detector were performed to determine the electron backscatter factor (EBF) for 6 MeV and 9 MeV electron beams of a Varian iX Silhouette. MCNP6.2 was used to calculate the EBF and corresponding measurements were carried out by using MOSFET detectors. The EBF was experimentally measured by the ratio of dose at the upstream surface of the silicone to the same point without the presence of the lead shield. The results derived by all four methods agreed within 2.8% for 6 MeV and 3.4% for 9 MeV beams. In detailed MC simulations, for 6 MeV, dose to the surface of 7-mm-thick absorber was 103.7 \(\pm\) 1.9% compared to dose maximum (Dmax) without lead. For 9 MeV, the dose to the surface of the 10-mm-thick absorber was 104.1 \(\pm\) 2.1% compared to Dmax without lead. The simplified MC simulation was recommended for practical treatment planning due to its acceptable calculation accuracy and efficiency. The simplified MC simulation was completed within 20 min using parallel processing with 80 CPUs, while the detailed MC simulation required 40 h to be done. In this study, we outline the procedures to use the lead shield covered by silicone in clinical practice from fabrication to dose calculation.

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Funding

This work was supported by National Research Foundation of Korea funded (No. 2019M2A2B4095126 and No. 2020R1F1A1073430).

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Authors and Affiliations

  1. Department of Radiation Oncology, Seoul National University Hospital, 101, Daehak-ro, Jongno-gu, 03080, Seoul, Republic of Korea

    Ohyun Kwon, Hyeongmin Jin, Jaeman Son, Chang Heon Choi, Jong Min Park, Jung-in Kim & Seongmoon Jung

  2. Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea

    Ohyun Kwon, Hyeongmin Jin, Jaeman Son, Chang Heon Choi, Jong Min Park, Jung-in Kim & Seongmoon Jung

  3. Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea

    Jaeman Son, Chang Heon Choi, Jong Min Park, Jung-in Kim & Seongmoon Jung

  4. Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea

    Jong Min Park

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  1. Ohyun Kwon
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  2. Hyeongmin Jin
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  5. Jong Min Park
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Correspondence to Seongmoon Jung.

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Kwon, O., Jin, H., Son, J. et al. Dose calculation of 3D printing lead shield covered by biocompatible silicone for electron beam therapy. Phys Eng Sci Med 44, 1061–1069 (2021). https://doi.org/10.1007/s13246-021-01041-y

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  • DOI: https://doi.org/10.1007/s13246-021-01041-y

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