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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:56 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Biophysics; Medical Physics
Title:
Gamma dose distribution evaluation of the XiO treatment planning system for static field IMRT, using AAPM TG119
Authors:
M. DUMITRACHE(1,3), Alina TĂNASE(2,3)
Affiliation:
1) Institute of Oncology ”Prof. Dr. Al. Trestioreanu”, Bucharest, Romania
2) Emergency Central Military Hospital ”Dr. Carol Davila” Bucharest, Romania
3) Faculty of Physics, University of Bucharest, Romania
E-mail
mihai149@yahoo.com
Keywords:
Quality assurance, treatment planing system, IMRT, gamma index
Abstract:
The purpose of this work was to perform a comprehensive comparison of fixed-beam intensity modulated radiation therapy (IMRT) for patient specific quality assurance (QA), in order to investigate commissioning of a XiO treatment planning system (TPS). QA measurements were evaluated for three of four test geometries provided in AAPM Task Group Report 119 (multitarget, prostate, head and neck). Using the XiO treatment planning system, fixed-beam IMRT treatment plans were constructed based on the structure sets copied to a parallelipipedic phantom which consists of solid water slabs and the 2D array.The plans were delivered to the phantom using an Elekta Synergy Platform – MLCi2 and the resulting dose distributions were measured in the coronal plane. Measured planar dose distributions were analyzed using gamma index with criteria of 2 %/2 mm. Also, point measurements were taken five times each using a Farmer type ion chamber situated in the center of a rectangular water phantom. Measured point doses were analyzed using percent difference. Conclusion: This study evaluates the response of the XiO TPS for static fields IMRT (step and shoot), using the 2D array 729, TG119 geometry sets and gamma analysis. The results showed an adequate level of accuracy for all the analyzed patient specific treatment plans, thus confirming the robustness of this radiotherapy treatment system, as a whole.
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