Evaluation of patient specific quality assurance of gated field in field radiation therapy technique using two-dimensional detector array

Authors

  • Dražan Jaroš Affidea, International Medical Centers, Center for Radiotherapy, Banja Luka, Bosnia and Herzegovina; Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina https://orcid.org/0000-0002-0722-8222
  • Goran Kolarević Affidea, International Medical Centers, Center for Radiotherapy, Banja Luka, Bosnia and Herzegovina; Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina https://orcid.org/0000-0003-2610-5911
  • Aleksandar Kostovski Affidea, International Medical Centers, Center for Radiotherapy, Banja Luka, Bosnia and Herzegovina https://orcid.org/0000-0002-0106-5987
  • Milovan Savanović Department of Radiotherapy, Hospital Tenon, Paris, France; Faculty of Medicine, University of Paris-Saclay, Le Kremlin-Bicetre, France https://orcid.org/0000-0003-1388-8427
  • Dejan Ćazić Affidea, International Medical Centers, Center for Radiotherapy, Banja Luka, Bosnia and Herzegovina; Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina https://orcid.org/0000-0002-1313-1128
  • Goran Marošević Affidea, International Medical Centers, Center for Radiotherapy, Banja Luka, Bosnia and Herzegovina; Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina https://orcid.org/0000-0002-3858-123X
  • Nataša Totorović Faculty of Science, University of Novi Sad, Novi Sad, Serbia https://orcid.org/0000-0001-8694-8860
  • Dragoljub Mirjanić Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina

DOI:

https://doi.org/10.17532/jhsci.2020.886

Keywords:

Patient-specific quality assurance , gated radiotherapy , detector array

Abstract

Introduction: Gated tangential field-in-field (FIF) technique is used to lower the dose to organs at risk for breast cancer radiotherapy (RT). In this study, the authors investigated the accuracy of the delivered treatment plan with and without gating using a two-dimensional detector array for patient-specific verification purposes.
Methods: In this study, a 6MV beams were used for the merged FIF RT (forward Intensity Modulated Radiation Therapy). The respiration signals for gated FIF delivery were obtained from the one-dimensional moving phantom using the real-time position management (RPM) system (Varian Medical Systems, Palo Alto, CA). RPM system used for four-dimensional computed tomography scanner light-speed, GE is based on an infrared camera to detect motion of external 6-point marker. The beams were delivered using a Clinac iX (Varian Medical Systems, Palo Alto, CA) with the multileaf collimator Millennium 120. The MapCheck2 (SunNuclear, Florida) was used for the evaluation of treatment plans. MapCheck2 was validated through a comparison with measurements from a farmer-type ion chamber. Gated beams were delivered using a maximum dose rate with varying duty cycles and analyzed the MapCheck2 data to evaluate treatment plan delivery accuracy.
Results: Results of the gamma passing rate for relative and absolute dose differences for all ungated and gated beams were between 95.1% and 100%.
Conclusion: Gated FIF technique can deliver an accurate dose to a detector during gated breast cancer RT. There is no significance between gated and ungated patient-specific quality assurance (PSQA); one can use ungated PSQA for verification of treatment plan delivery

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Published

2020-07-22

How to Cite

Jaroš, D., Kolarević, G., Kostovski, A., Savanović, M., Ćazić, D., Marošević, G., Totorović, N., & Mirjanić, D. (2020). Evaluation of patient specific quality assurance of gated field in field radiation therapy technique using two-dimensional detector array. Journal of Health Sciences, 10(2), 109-114. https://doi.org/10.17532/jhsci.2020.886

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Section

Research articles