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Methodology for in Vivo Dosimetry Using TLD-100 for Radiotherapic Treatment


B TEIGA RODRIGUES*, P DOMINGUES DE SOUZA , C Daruich de Souza , M Chuery Martins Rostelato , C Zeituni , B Ribeiro Nogueira , J de Oliveira Marques , A Sorgatti de Souza , Nuclear and Energy Research Institute, Sao Paulo, Sao Paulo


SU-I-GPD-T-306 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: Cancer is a public health problem that affects approximately 27 million people worldwide. The most common type in Brazil among men is prostate cancer with 61 thousand cases. There are two forms of radiotherapy treatments that can be used: teletherapy and brachytherapy. Before starting the teletherapy treatment, a planning is done that makes the acquisition of the anatomical information of the patient to then classify the areas of interest. Dosimetry is performed as a quality control to ensure that the calculated dose is equal to that received by the patient. . In vivo dosimetry acts as an independent measurement and this work aims at comparing the dosimetry performed using thermoluminescent dosimeters (LiF: Mg, Ti - TLD - 100) with dose values calculated in the planning system (TPS).

Methods: All dosimeters were prepared to be used in an anthropomorphic phantom. A selection of dosimeters, 50 micro TLD's, selected after heat treatment, were then irradiated and a reading was made. A case planned by TPS was selected and compared the dosimetry performed in an anthropomorphic phantom for the same case.

Results: All values obtained were within the deviation (±5%) allowed by the protocol. The results of this work will help to implement a new quality program in the Radiotherapy Service at Hospital das Clínicas de São Paulo.

Conclusion: The accurate dosimeter selection provided a feasible and reliable evaluation that enabled the comparison.

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