Tsuji, S.; Narihiro, N.; Oita, M.; Namito, Y.; Hirayama, H. High Dose Rate 192Ir Brachytherapy Source Model Monte Carlo Dosimetry: MHDR-v2 and MHDR-V2r. PLOS ONE 2024, 19, e0298550, doi:10.1371/journal.pone.0298550.
Tsuji, S.; Narihiro, N.; Oita, M.; Namito, Y.; Hirayama, H. High Dose Rate 192Ir Brachytherapy Source Model Monte Carlo Dosimetry: MHDR-v2 and MHDR-V2r. PLOS ONE 2024, 19, e0298550, doi:10.1371/journal.pone.0298550.
Tsuji, S.; Narihiro, N.; Oita, M.; Namito, Y.; Hirayama, H. High Dose Rate 192Ir Brachytherapy Source Model Monte Carlo Dosimetry: MHDR-v2 and MHDR-V2r. PLOS ONE 2024, 19, e0298550, doi:10.1371/journal.pone.0298550.
Tsuji, S.; Narihiro, N.; Oita, M.; Namito, Y.; Hirayama, H. High Dose Rate 192Ir Brachytherapy Source Model Monte Carlo Dosimetry: MHDR-v2 and MHDR-V2r. PLOS ONE 2024, 19, e0298550, doi:10.1371/journal.pone.0298550.
Abstract
After 2010, the source model of the microSelectron HDR Afterloader System was slightly modified from the previous model. Granero et al. named the modified source model “mHDR-v2r (revised model mHDR-v2)” and the previous model “mHDR-v2”. They concluded that the dosimetric differences arising from the dimensional changes between the mHDR-v2 and mHDR-v2r designs were negligible at almost all locations (within 0.5 % for r ≥ 0.25 cm), the two-dimensional anisotropy function difference between the two sources is found 2.1 % at r = 1.0 cm when compared with the results of the other experimental group. To confirm this difference, we performed a full Monte Carlo simulation without the energy fluence approximation. This is useful near the radiation source where charged-particle equilibrium does not hold. The two-dimensional anisotropy function of the TG-43U1 dataset showed a few percent difference between the mHDR-v2r and mHDR-v2 sources. There was no agreement in the immediate vicinity from the source (0.10 cm and 0.25 cm), when compared to Granero et al. in mHDR-v2r sources. The differences in these two-dimensional anisotropy functions were identified.
Keywords
Ir-192; HDR brachytherapy; dosimetry; Monte Carlo; EGS5
Subject
Physical Sciences, Radiation and Radiography
Copyright:
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