title: Comparison between beta radiation dose distribution due to LDR and HDR ocular brachytherapy applicators using GATE Monte Carlo platform.
abstract: Eye applicators with 90Sr/90Y and 106Ru/106Rh beta-ray sources are generally used in brachytherapy for the treatment of eye diseases as uveal melanoma. Whenever, radiation is used in treatment, dosimetry is essential. However, knowledge of the exact dose distribution is a critical decision-making to the outcome of the treatment. The Monte Carlo technique provides a powerful tool for calculation of the dose and dose distributions which helps to predict and determine the doses from different shapes of various types of eye applicators more accurately. The aim of this work consisted in using the Monte Carlo GATE platform to calculate the 3D dose distribution on a mathematical model of the human eye according to international recommendations. Mathematical models were developed for four ophthalmic applicators, two HDR 90Sr applicators SIA.20 and SIA.6, and two LDR 106Ru applicators, a concave CCB model and a flat CCB model. In present work, considering a heterogeneous eye phantom and the chosen tumor, obtained results with the use of GATE for mean doses distributions in a phantom and according to international recommendations show a discrepancy with respect to those specified by the manufacturers. The QC of dosimetric parameters shows that contrarily to the other applicators, the SIA.20 applicator is consistent with recommendations. The GATE platform show that the SIA.20 applicator present better results, namely the dose delivered to critical structures were lower compared to those obtained for the other applicators, and the SIA.6 applicator, simulated with MCNPX generates higher lens doses than those generated by GATE.
authors: Laboratory of Nuclear Science and Radiation-Matter Interactions (LSNIRM) USTHB, Bab Ezzouar 16111, Algiers, Algeria; Laboratory of Theoretical Physics and Radiation-Matter Interactions (LPTHIRM) USDB, Soumaa 09000 Blida, Algeria. Electronic address: laouesmus192@gmail.com.
authors: Laoues
authors: L
authors: Mostafa
authors: Laboratory of Theoretical Physics and Radiation-Matter Interactions (LPTHIRM) USDB, Soumaa 09000 Blida, Algeria.
authors: Khelifi
authors: K
authors: Rachid
authors: Laboratory of Nuclear Science and Radiation-Matter Interactions (LSNIRM) USTHB, Bab Ezzouar 16111, Algiers, Algeria; Laboratory of Theoretical Physics and Radiation-Matter Interactions (LPTHIRM) USDB, Soumaa 09000 Blida, Algeria.
authors: Sidi Moussa
authors: SM
authors: Ahmed
mesh_terms: D001610:Beta Particles / Q000009:adverse effects / Q000627:therapeutic use*; D001918:Brachytherapy / Q000009:adverse effects / Q000295:instrumentation*; D005123:Eye / Q000528:radiation effects*; D005134:Eye Neoplasms / Q000532:radiotherapy; D006801:Humans; D009010:Monte Carlo Method; D058958:Organs at Risk / Q000528:radiation effects; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011874:Radiometry; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D015203:Reproducibility of Results
keywords: (106)Ru; (90)Sr; Dosimetry; Eye applicators; GATE 6.1; HDR; LDR