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Showing 2 results for Thermoluminescent Dosimetry

H. Acar, Dr. G. Yavas, C. Yavas,
Volume 11, Issue 1 (1-2013)
Abstract

Background: Broca’s and Wernicke’s areas, which are important language areas of brain, are commonly irradiated in patients with right frontal lobe glioblastomamultiforme (GBM). We aimed to compare two different treatment planning techniques in terms of the doses in the Broca’s and Wernicke’s areas for the patients with right frontal GBM. Materials and Methods: Two different treatment planning techniques of right frontal GBM were generated for Rando phantom: two field technique using parallel opposed beams and three field techniques. Both plans were compared for doses in planning target volume (PTV), Broca’s and Wernicke’s areas. Additionally to test the accuracy of treatment planning system (TPS) dose calculation thermoluminescent dosimeters (TLD) were used. Results: The three field technique allowed the lower doses in the Broca’s and Wernickes’s areas. The doses calculated in the Broca’sand Wernicke’s areas were 0.98% ± 0.03 and 0.09% ± 0.06 of the isocenter dose with three field and 1.06% ± 0.04 and 0.133% ± 0.03 of the isocenter dose with two field techniques respectively. When the doses measured by TLD and calculated with TPS were compared the differences were 3.23% and 2.92 % for Broca’s area, and 4.12 % and 3.95% for Wernicke’s area for two field and three field techniques respectively. Conclusion: There was a good agreement between TPS and TLD calculations for both techniques. Three field techniques seem to be more advantageous than two field technique with respect to doses of Broca’s and Wernicke’s areas. However this finding should be clarified with further clinical studies.


A. Mezaache, C.z. Benkhelifa, E. Şahiner, F. Kharfi,
Volume 22, Issue 4 (10-2024)
Abstract

Background: This study investigates various aspects of TLD-100H radiation dosimeter, including luminescence kinetics, dose response, and the effects of the combination of thermally stimulated (TL) and optically stimulated (OSL) luminescence modes. Materials and Methods: The TL kinetic parameters were determined using general order kinetics via computerized glow-curve deconvolution (GOK-CGCD). OSL decay curves and kinetics were also investigated through OSL signal decomposition. The dose response was studied for a practical dose range of 2-80 Gy. Interesting OSL and TL reading modes combination were also tested. Results: The identified dosimetric peak at ~560 K was deconvoluted into two main peaks (553K and 568K). The dose response study reveals a sublinear behaviour within the considered dose range. Two dominating types of fast and slowly decaying OSL traps were identified. Indicative values of de-trapping probabilities and photoexcitation cross sections of these OSL traps are thus provided. Results of TL and OSL reading modes combination demonstrate well that measuring TL signal before OSL resulted in almost complete erasure of the OSL signal. Additionally, an increase in TL integral intensity by ~+10% was observed when OSL measured firstly, likely due to the emptying of a limited number of lower temperature shallow traps by OSL. Indeed, these no longer applied a screen effect for the higher temperature traps, making their release more prominent in TL reading mode. Consequently, improving or optimizing the TL signal. Conclusions: These findings contribute to a better understanding of TLD-100H’s behaviour and support its reliability as a radiation dosimeter in medical physics.


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