Applicator Attenuation Effect on Dose Calculations of Esophageal High-Dose Rate Brachytherapy Using EDR2 Film

Authors

  • Elham Boroghani Physics Department, Gilan University, Rasht, Iran
  • Hamid Reza Baghani Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran
  • Ramezan Eidi Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran
  • Ramin Jaberi Imam Khomeini Hospital, Tehran University of Medical Science, Tehran, Iran
  • Seied Rabi Mahdavi Medical Physics Department, Tehran University of Medical Science, Tehran, Iran
  • Seyed Mahmoud Aghamiri Radiation Medicine Department, Shahid Beheshti University, Tehran, Iran
Abstract:

Introduction Interaluminal brachytherapy is one of the important methods of esophageal cancer treatment. The effect of applicator attenuation is not considered in dose calculation method released by AAPM-TG43. In this study, the effect of High-Dose Rate (HDR) brachytherapy esophageal applicator on dose distribution was surveyed in HDR brachytherapy. Materials and Methods A cylindrical PMMA phantom was built in order to be inserted by various sizes of esophageal applicators. EDR2 films were placed at 33 mm from Ir-192 source and irradiated with 1.5 Gy after planning using treatment planning system for all applicators. Results The results of film dosimetry in reference point for 6, 8, 10, and 20 mm applicators were 1.54, 1.53, 1.48, and 1.50 Gy, respectively. The difference between practical and treatment planning system results was 0.023 Gy (

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Journal title

volume 9  issue 1

pages  19- 24

publication date 2012-03-01

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