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Volume 15, Number 5, 2010

Verification in the water phantom of the irradiation time calculation done by the algorithm used in intraoperative radiotherapy

Maria Słyk; Marcin Litoborski


Aim: The investigation of the irradiation time calculation accuracy of the GGPB algorithms
which can be used in intraoperative radiotherapy.
Materials and methods: PDDs and OFs for electron beams from Mobetron and all available applicators were measured in order to configure the GGPB algorithm. Afterwards, the irradiation times for the prescribed dose of 3 Gy were calculated by means of it. The results of calculations were verified in the water phantom using the Marcus ionization chamber .
Results: The results differed between energies. For 6 MeV the irradiation times calculated by the GGPB algorithm were correct, for the energy of 9 MeV they were too small and for the energy of 4 MeV they were too large for applicators with smaller diameters, while acceptable for the remaining ones.
Conclusion: The GGPB algorithm can be used in intraoperative radiotherapy for energy and applicator sets for which no significant difference between the measured and the prescribed dose was obtained.

Signature: Rep Pract Oncol Radiother, 2010; 15(5) : 132-137

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