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Commissioning and evaluation of a radiochromic EBT3 film dosimetry system

Published online by Cambridge University Press:  30 October 2018

Muhammad Isa Khan*
Affiliation:
Faculty of Sciences, University of Gujrat, Gujrat, Punjab, Pakistan
Muhammad Bilal Tahir
Affiliation:
Faculty of Sciences, University of Gujrat, Gujrat, Punjab, Pakistan
Muhammad Rafique
Affiliation:
Faculty of Sciences, University of Gujrat, Gujrat, Punjab, Pakistan
Tahir Iqbal
Affiliation:
Faculty of Sciences, University of Gujrat, Gujrat, Punjab, Pakistan
Sabiha Zulfiqar
Affiliation:
Faculty of Sciences, University of Gujrat, Gujrat, Punjab, Pakistan
Aliza Zahoor
Affiliation:
Faculty of Sciences, University of Gujrat, Gujrat, Punjab, Pakistan
Jalil ur Rehman
Affiliation:
Balochistan University of Information Technology, Engineering and Management Sciences (BUITEMS), Quetta, Balochistan, Pakistan
Khalid Iqbal
Affiliation:
Shaukat Khanum Memorial Cancer Hospital and Research Centre (SKMH&RC), Lahore, Punjab, Pakistan
James Chow
Affiliation:
Princess Margaret Hospital Cancer Centre, Toronto, Ontario, Canada
*
Author for correspondence: M. Isa Khan, Faculty of Sciences, University of Gujrat, Gujrat, Punjab 65100, Pakistan. E-mail: isaiub@yahoo.com

Abstract

Purpose

This work reports our study to commission a radiochromic film dosimetry system using the timely EBT3 film. We carried out dosimetric evaluations on different characteristics of photon beams (e.g., flatness, symmetry and penumbra) in radiation dose delivery.

Materials and Methods

A Varian linear accelerator producing 6 and 15 MV photon beams with 120 multi-leaf collimator was used in this study. PTW ionisation chamber was used to measure the beam characteristics such as symmetry, flatness and penumbra and these measurements were used to commission the radiochormic EBT3 film dosimetry system. The results of irradiated films were analysed using the radiochromic film QA Pro software 2016.

Results

The measured film doses were analysed at two different colour channels (green and red) using two scanning geometries (i.e., upper or lower side of film facing the scanner light source) at two dose levels (10 and 40 Gy). The difference between the ionisation chamber and film results was found insignificant and within the acceptable range as per the World Health Organisation standard.

Conclusion

Results of the comparison between the ionisation chamber and film measurements show that our radiochormic EBT3 film dosimetry system is reliable and cost-effective in the output measurement of a linear accelerator. Our measurements confirm that our EBT3 film dosimetry agreed well with the ionisation chamber, and can be used as a re-validation tool for linear accelerator quality control.

Type
Original Article
Copyright
© Cambridge University Press 2018 

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Footnotes

Cite this article: Isa Khan M, Bilal Tahir M, Rafique M, Iqbal T, Zulfiqar S, Zahoor A, ur Rehman J, Iqbal K, Chow J. (2019) Commissioning and evaluation of a radiochromic EBT3 film dosimetry system. Journal of Radiotherapy in Practice18: 55–62. doi: 10.1017/S1460396918000444

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