Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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Assessment of Temporary Radioactivation for Tissue Expanders in Breast Radiation Therapy: Preliminary Study

  • Hwajung Lee (Department of Radiation Oncology, Chung-Ang University Gwangmyeong Hospital) ;
  • Do Hoon Oh (Department of Radiation Oncology, Chung-Ang University Gwangmyeong Hospital) ;
  • Lee Yoo (Department of Radiation Oncology, Chung-Ang University Gwangmyeong Hospital) ;
  • Minsoo Chun (Department of Radiation Oncology, Chung-Ang University Gwangmyeong Hospital)
  • Received : 2023.02.19
  • Accepted : 2023.05.24
  • Published : 2023.06.30
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Abstract

Background: As breast tissue expanders consist of metallic materials in the needle guard and ferromagnetic injection port, irradiation can produce radioactivation. Materials and Methods: A CPX4 (Mentor Worldwide LLD) breast tissue expander was exposed using the Versa HD (Elekta) linear accelerator. Two photon energies of 6 and 10 MV-flattening filter free (FFF) beams with 5,000 monitor units (MU) were irradiated to identify the types of radiation. Furthermore, 300 MU with 10 MV-FFF beam was exposed to the CPX4 breast tissue expander by varying the machine dose rates (MDRs) 600, 1,200, and 2,200 MU/min. To assess the instantaneous dose rates (IDRs) solely from the CPX4, a tissue expander was placed outside the treatment room after beam irradiation, and a portable radioisotope identification device was used to identify the types of radiation and measure IDR. Results and Discussion: After 5,000 MU delivery to the CPX4 breast tissue expander, the energy spectrum whose peak energy of 511 keV was found with 10 MV-FFF, while there was no resultant one with 6 MV-FFF. The time of each measurement was 1 minute, and the mean IDRs from the 10 MV-FFF were 0.407, 0.231, and 0.180 μSv/hr for the three successive measurements. Following 10 MV-FFF beam irradiation with 300 MU indicated around the background level from the first measurement regardless of MDRs. Conclusion: As each institute room entry time protocol varies according to the working hours and occupational doses, we suggest an addition of 1 minute from the institutes' own room entry time protocol in patients with CPX4 tissue expander and the case of radiotherapy vaults equipped with a maximum energy of 10 MV photon beams.

Keywords

Acknowledgement

This study was supported by research grant from Biomedical Research Institute, Chung-Ang University Hospital (2022). Authors would like to address a warm appreciation to RemTech Co., Ltd. to support a RIIDEye X-GN device.

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