Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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Development and Evaluation of a Thimble-Like Head Bolus Shield for Hemi-Body Electron Beam Irradiation Technique

  • Shin, Wook-Geun (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Lee, Sung Young (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Jin, Hyeongmin (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Kim, Jeongho (Department of Radiation Oncology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine) ;
  • Kang, Seonghee (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Kim, Jung-in (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Jung, Seongmoon (Department of Radiation Oncology, Seoul National University Hospital)
  • Received : 2022.01.20
  • Accepted : 2022.04.21
  • Published : 2022.09.30
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Abstract

Background: The hemi-body electron beam irradiation (HBIe-) technique has been proposed for the treatment of mycosis fungoides. It spares healthy skin using an electron shield. However, shielding electrons is complicated owing to electron scattering effects. In this study, we developed a thimble-like head bolus shield that surrounds the patient's entire head to prevent irradiation of the head during HBIe-. Materials and Methods: The feasibility of a thimble-like head bolus shield was evaluated using a simplified Geant4 Monte Carlo (MC) simulation. Subsequently, the head bolus was manufactured using a three-dimensional (3D) printed mold and Ecoflex 00-30 silicone. The fabricated head bolus was experimentally validated by measuring the dose to the Rando phantom using a metal-oxide-semiconductor field-effect transistor (MOSFET) detector with clinical configuration of HBIe-. Results and Discussion: The thimble-like head bolus reduced the electron fluence by 2% compared with that without a shield in the MC simulations. In addition, an improvement in fluence degradation outside the head shield was observed. In the experimental validation using the inhouse-developed bolus shield, this head bolus reduced the electron dose to approximately 2.5% of the prescribed dose. Conclusion: A thimble-like head bolus shield for the HBIe- technique was developed and validated in this study. This bolus effectively spares healthy skin without underdosage in the region of the target skin in HBIe-.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant, funded by the Korean government (No. NRF-2020R1F1A1073430).

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