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1 results

  • In vivo dosimetry using radiochromic films (EBT-2) during intraoperative radiotherapy
  • Zahra Rahimzade Yekta, Seied Rabi Mehdi Mahdavi, Hamid Reza Baghani, Mostafa Robatjazi, Ahmad Mostaar, Hamidreza Mirzaie, Dariush Sardari, Mohammad Esmaeil Akbari, Nahid Nafisi
  • Journal: Journal of Radiotherapy in Practice / Volume 15 / Issue 4 / December 2016
  • Published online by Cambridge University Press: 06 June 2016, pp. 378-384
  • Print publication: December 2016
  • View abstract
    Background

    Intraoperative radiotherapy is a method of choice to deliver a critical radiation dose to the tumour bed immediately after surgical excision.

    Aim

    The purpose of this work is to check the dose delivered to the patients during intraoperative electron beam radiation therapy (IOERT) in the conservative treatment of breast cancer, by means of reference dose measurement using radiochromic (EBT-2) films.

    Material and methods

    Ninety patients with early-stage breast cancer underwent exclusive IOERT to the tumour bed using a LIAC linear accelerator. Absolute dose measurements were done with film pieces. After irradiation, the pixel values of the films were obtained via MATLAB and ImageJ softwares. Calibration curve was also used for calculating net optical density. Expected dose was compared to the patient delivered dose.

    Results

    The mean deviation of the delivered dose from the expected one was 2·56% that is well in the accepted criteria. Only in one case, there was a larger deviation due to barometer miscalibration.

    Findings

    EBT-2 film response is independent from dose-per-pulse and as it was shown in this study it can be robustly used during breast IOERT for dosimetric and also positioning verifications.