A Study on Amorphous Silicon Electronic Portal Imaging Device (A-Si EPID) Response to Delivered Radiation Doses

Authors

  • Mark Pokoo-Aikins Radiological and Medical Sciences Research Institute, Ghana Atomic Energy Commission, P.O Box LG 80, Legon Accra, Ghana
  • Augustine K. Kyere Department of Physics of the School of Physical Sciences, College of Agriculture and Natural Sciences University of Cape Coast, Graduate School of Nuclear and Allied Sciences, University of Ghana, Department of Medical Physics, P.O. Box AE 1, Atomic, Accra-Ghana
  • Moses J. Eghan
  • Samuel N. Tagoe National Centre for Radiotherapy and Nuclear Medicine Dept., Korle-Bu Teaching Hospital, Ghana
  • Philip O. Kyeremeh SGMC Cancer Centre, Radiation Oncology Physics, P.O. Box CT 3286, Cantonments Accra, Ghana
  • George F. Acquah SGMC Cancer Centre, Radiation Oncology Physics, P.O. Box CT 3286, Cantonments Accra, Ghana
  • Francis Hasford Graduate School of Nuclear and Allied Sciences, University of Ghana, Department of Medical Physics, P.O. Box AE 1, Atomic, Accra-Ghana

Keywords:

Electronic Portal Imaging Devices (EPID), dosimetric properties, radiation dosimetry

Abstract

The use of amorphous silicon flat panel-type electronic portal imaging device (a-Si EPID) as dosimeters in radiotherapy has seen gradual increase in recent times. This research study has assessed dosimetric response of a-Si EPID (Elekta iViewGT) with respect to photon beam qualities on Elekta Synergy Platform linac. Images acquired under reference conditions of 10×10 cm² open field with the a-Si EPID at source to EPID distance (SED) of 159 cm and varying dose of 1-3 Gy in polymethyl methacrylate (PMMA) solid water phantom slabs were used. The experiment was repeated with Farmer-type PTW ionization chamber (IBA 30010) in position and measurement taken at 10 cm in the solid water phantom.

Set up conditions for EPID and IC remained same throughout the study. The study observed similar and proportional increases in EPID and IC signals with increasing dose. Maximum deviation of 7.2 % was recorded between EPID and IC measurements. Outcome of the study demonstrates that the a-Si EPID is appropriate for dosimetric verification purposes on the Elekta linac. Comprehensive evaluation of dosimetric properties of EPIDs is thus necessary to ensure reliability in dose measurements on different linac systems.

References

Y. Lemoigne and A. Caner, Radiotherapy and Brachytherapy, no. 1. 2007.

IAEA, Development of procedures for in vivo dosimetry in radiotherapy.IAEA Human Health Reports No. 8, IAEA Human. 2013.

A. Barrett, J. Dobbs, S. Morris, and T. Roques, Practical radiotherapy planning., 4th Editio. Hodder Arnold company, 2009.

S. Nijsten, “Portal Dosimetry in Radiotherapy,” 2009.

M. Wendling, R. J. W. Louwe, L. N. McDermott, J. J. Sonke, M. Van Herk, and B. J. Mijnheer, “Accurate two-dimensional IMRT verification using a back-projection EPID dosimetry method,” Med. Phys., vol. 33, no. 2, pp. 259–273, Jan. 2006.

K. Slosarek, M. Szlag, B. Bekman, and A. Grzadziel, “EPID in vivo dosimetry in RapidArc technique,” Reports Pract. Oncol. Radiother., vol. 15, no. 1, pp. 8–14, 2010.

B. L. Seng, “2-D Dose Measurement Using a Flat Panel Epid,” University of British Columbia, 2008.

Elekta, “iViewGTTM R3.02 - R3.4 Manual,” 2010.

PTW, “User Manual Farmer Chamber Ionization Chamber,” pp. 1–42, 2016.

N. E. S. Dina Abdelaziz, Wafaa Khalifa, “Efficacy of Use of A-Si EPID as Imaging Device in IMRT QA,” IOSR J. Appl. Phys., vol. 7, no. 1, pp. 27–43, 2015.

Downloads

Published

2019-10-16

How to Cite

Pokoo-Aikins, M. ., K. Kyere, A. ., J. Eghan, M. ., N. Tagoe, S. ., O. Kyeremeh, P. ., F. Acquah, G. ., & Hasford, F. . (2019). A Study on Amorphous Silicon Electronic Portal Imaging Device (A-Si EPID) Response to Delivered Radiation Doses. International Journal of Sciences: Basic and Applied Research (IJSBAR), 48(4), 66–73. Retrieved from https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/10314

Issue

Vol. 48 No. 4 (2019)

Section

Articles

License

Authors who submit papers with this journal agree to the following terms.