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Information Journal Paper

Title

Evaluation of dosimetric characteristics of diodes and ionization chambers in small megavoltage photon field dosimetry

Pages

  311-321

Abstract

 Background: Modern radia on therapy such as intensity modulated radia on therapy (IMRT) and volumetric modulated arc therapy (VMAT) has resulted in using small therapeu c photon beams. The scope of this work is to inves gate the varia on in efficiency of different ioniza on chambers and semiconductor diodes in small mul-leaf collimator (MLC) defined fields of ARTISTE linear accelerator. Materials and Methods: Dose distribu ons measurements was done in field sizes ranging from 0. 5×0. 5 to 10×10 cm2 combining with Monte Carlo (MC) simula on. The treatment head of linac and the detectors were simulated by means of BEAMnrc/DOSXYZnrc of EGSnrc MC. The parameters such as output ra o (OR), penumbral width, dosimetric field size and the percentage surface dose in small radia on fields was evaluated using ioniza on chambers and semiconductor dosimeters. Results: ORs and beam profiles resul ng from various measurements showed significant difference between ioniza on chambers and diodes in small fields. Deriva on of less than 2% was observed between EDGE and diode P. ORs vary by more than 30% for 1×1 cm2 field size but, in larger field sizes differences was less than 1%. Penumbra underes ma on was seen in Semiflex rela ve to pinpoint ioniza on chamber. No difference was seen in the pa? ern of surface dose among the applied detectors. Conclusion: Dosimetric characteris cs of different detectors showed significant differences in small photon beams. Profiles and ORs analysis with different dosimeters showed that not only water equivalency of detectors, but also dosimeter ac ve volume is important factors for determina on of dosimetric behavior in small photon beams.

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    Cite

    APA: Copy

    Keivan, h., SHAHBAZI GAHROUEI, D., & Shanei, A.. (2018). Evaluation of dosimetric characteristics of diodes and ionization chambers in small megavoltage photon field dosimetry. INTERNATIONAL JOURNAL OF RADIATION RESEARCH, 16(3), 311-321. SID. https://sid.ir/paper/286743/en

    Vancouver: Copy

    Keivan h., SHAHBAZI GAHROUEI D., Shanei A.. Evaluation of dosimetric characteristics of diodes and ionization chambers in small megavoltage photon field dosimetry. INTERNATIONAL JOURNAL OF RADIATION RESEARCH[Internet]. 2018;16(3):311-321. Available from: https://sid.ir/paper/286743/en

    IEEE: Copy

    h. Keivan, D. SHAHBAZI GAHROUEI, and A. Shanei, “Evaluation of dosimetric characteristics of diodes and ionization chambers in small megavoltage photon field dosimetry,” INTERNATIONAL JOURNAL OF RADIATION RESEARCH, vol. 16, no. 3, pp. 311–321, 2018, [Online]. Available: https://sid.ir/paper/286743/en

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