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Identifier 000352291
Title Ανάπτυξη μεθόδου εκτίμησης της περιφερικής δόσης για δέσμες φωτονίων 6 και 18 MV στην ακτινοθεραπεία
Author Ζαχαροπούλου, Φωτεινή
Thesis advisor Δαμηλάκης. Ιωάννης
Reviewer Μαζωνάκης, Μιχάλης
Abstract Radiotherapy, radiation dose to critical structures (e.g. fetus, ovaries, testes, thyroid, pacemaker) outside the primary radiation field must be minimized. In these cases, the dose delivered outside the primary field (peripheral dose, PD) must be evaluated prior to the treatment and reduced if necessary. A number of factors-parameters of the treatment planning influence the PD. In the present study, an inclusive experimental study on the parameters that influence the PD was completed using a modern linear accelerator (LINAC). This dependence was evaluated for each of these factors, in order to develop an applicable method to estimate the PD for various treatments planning. For this purpose, two dosimetric methods were utilized: a) ionization chamber in a water phantom and b) thermoluminescent dosimeters (TLDs) in three different anthropomorphic phantoms, simulating the bodies of 5 and 10 years old children and one of an adult. The first method was the basic dosimetric system and the second one was used as a validation method for the PD measurements and the developed method overall. Moreover, a second LINAC was used to examine whether the developed method is applicable to other LINACs. The present study resulted in the evaluation of the PD dependence on a number of factorsparameters of the treatment planning and consequently in the development of a method to estimate the PD. The TLD measurements verified the credibility of the PD measurements and the accuracy of the developed method. This method is applicable to other LINACs and can also be used for the PD estimation in children considering a PD overestimation in these cases.
Language Greek
Subject Radiation Dosage
Ακτινοβολίας δοσολογία
Issue date 2007-07-26
Collection   School/Department--School of Medicine--Department of Medicine--Post-graduate theses
  Type of Work--Post-graduate theses
Notes Διαπανεπιστημιακό διατμηματικό μεταπτυχιακό πρόγραμμα σπουδών στην Ιατρική Φυσική-Ακτινοφυσική.
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