Evaluation of lung heterogeneity effects on dosimetric parameters in small photon fields using MAGIC polymer gel, Gafchromic film, and Monte Carlo simulation

Wrya Parwaie; Ghazale Geraily; Alireza Shirazi; Mehran Yarahmadi; Ahmad Shakeri; Mahdieh Afkhami Ardekani

doi:10.1016/j.apradiso.2020.109233

Evaluation of lung heterogeneity effects on dosimetric parameters in small photon fields using MAGIC polymer gel, Gafchromic film, and Monte Carlo simulation

Appl Radiat Isot. 2020 Dec:166:109233. doi: 10.1016/j.apradiso.2020.109233. Epub 2020 Aug 9.

Authors

Wrya Parwaie¹, Ghazale Geraily², Alireza Shirazi¹, Mehran Yarahmadi³, Ahmad Shakeri⁴, Mahdieh Afkhami Ardekani⁵

Affiliations

¹ Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
² Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran. Electronic address: gh-geraily@sina.tums.ac.ir.
³ Department of Medical Physics, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran.
⁴ Valiasr Radiotherapy Oncology Center, Valiasr Hospital, Qom, Iran.
⁵ Department of Radiology, Faculty of Para-Medicine, Hormozgan University of Medical Sciences, Bandar Abbas, Iran. Electronic address: m.afkhami87@gmail.com.

PMID: 32836165
DOI: 10.1016/j.apradiso.2020.109233

Abstract

In this work, the performance of MAGIC polymer gel in measuring dosimetric parameters beyond lung heterogeneity in small fields was investigated. All data were obtained using MAGIC, EBT2, and MC in four small field sizes. The maximum local differences between MAGIC and MC were less than 5.1, 3.9, 3.1, and 2.6% for PDD values behind lung heterogeneity at 5, 10, 20, and 30 mm field sizes, respectively. The findings showed that MAGIC is a suitable tool for dosimetry behind low-density heterogeneity.

Keywords: Heterogeneity; MAGIC polymer Gel; Penumbra; Small field.