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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 9:28 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Biophysics; Medical Physics
Title:
A comparative study on 6 MeV photon beam percentage depth dose of Varian CLINAC 2300 C/D, Elekta Synergy Platform, and Siemens Primus linacs
Authors:
Mihai Dumitrache (1), Raducu Popa (2), Alina Ciovlicã (3)
Affiliation:
Army’s Medical Research Center - expert in radiotherapy physics;(1)
Institute of Oncology, Bucharest - expert in radiotherapy physics(2)
OncoFort Radiotheraphy Center- Gral Medical – (3)
E-mail
alina.ciovlica@gralmedical.ro;raducupopa@email.ro;
Keywords:
3D conformal planning systems, percentage depth dose, treatment quality
Abstract:
In Romania, in the last few years, the radiotherapy services have been significantly improved due to installations of new equipments provided with 3D conformal planning system from Varian, Elekta, and Siemens. From the physicist point of view, a very important issue is the homogeneity of the beam parameters. Regarding this matter, we are bringing into discussion the possibility of obtaining a similar treatment quality in all radiotherapy centres by providing a very useful database for the commissioning process and a comparison between beam parameters for all megavoltage medical units already mentioned. This work presents a comparative study of the 6 MeV percentage depth dose curves for photon beams of Varian CLINAC 2300 C/D, Elekta Synergy Platform and Siemens Primus linacs. The measurements were performed for a set of 7 field sizes (5×5, 10×10, 15x15, 20×20, 25×25, 30×30, 40×40) cm2, keeping the same conditions (e.g., geometry, ion chamber voltage and polarity, incremental step and direction). During our study we used a Mephysto MC2 software and two semiflex ion chambers from Physikalisch-Technische Werkstätten GmbH, calibrated in water under 60^Co beam. Although, the architecture of the treatment heads, for all three accelerators, is quite different, the comparison between percentage depth dose curves showed that, the clinical results should be the same if the treatment plan and biological response of the tumour are the same.
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