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Patient-specific quality control for intensity-modulated radiation therapy and volumetric-modulated arc therapy using electronic portal imaging device and two-dimensional ion chamber array

Published online by Cambridge University Press:  05 September 2018

Abu Kausar ,
Karthick R. Mani ,
Hasin A. Azhari  and
Golam A. Zakaria
Abu Kausar
Affiliation:
Department of Medical Physics and Biomedical Engineering, Gono University, Dhaka, Bangladesh
Karthick R. Mani
Affiliation:
Department of Radiation Oncology, United Hospital Limited, Dhaka, Bangladesh
Hasin A. Azhari*
Affiliation:
Department of Medical Radiation Physics, Gummersbach Hospital, Academic Teaching Hospital of the University of Cologne, Gummersbach, Germany
Golam A. Zakaria
Affiliation:
Department of Medical Radiation Physics, Gummersbach Hospital, Academic Teaching Hospital of the University of Cologne, Gummersbach, Germany
*
Author for correspondence: Professor Hasin Anupama Azhari, Department of Medical Physics and Biomedical Engineering, Gono University (Bishwabidyalay), Nolam Campus, Post Office: Mirzanagar via Savar Cantonment, Savar, Dhaka-1344, Bangladesh. Tel: +8801711841063. E-mail: ahasinanupama@gmail.com
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Abstract

Aim

The purpose of this study was to develop the patient-specific quality control (QC) process by most commonly used dosimeters in Bangladesh and recommend a suitable passing rate for QC, irrespective of the dosimetric tools used.

Materials and methods

Intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) plans of five head-and-neck (HN) and five prostate patients were selected for the patient-specific QC. These plans were generated using the Eclipse TPS v11·0 (Varian Medical Systems, Inc., Palo Alto, CA, USA) 6 MV X-ray from a Varian TrueBeam linear accelerator (Varian Medical Systems, Inc.) for each case. Each IMRT and VMAT plans were measured by two-dimensional (2D) ion chamber arrays (I’matriXX) and electronic portal imaging devices (EPID), respectively. The passing rates of the dosimetric tools were calculated using criteria of 3%/3 mm.

Results

The average passing rates (±SD) of I’matriXX for prostate and HN were 97·9±0·76 and 98·88±0·24, respectively. For VMAT verification, the average passing rates of EPID for prostate for arc1 and arc2 were 96·15±0·49 and 97·8±0·70, respectively; similarly, for HN the rates were 97·85±0·63 and 97·2±0·56, respectively.

Conclusion

The results showed that both the dosimeters can be used in patient-specific QC, although the EPID-based IMRT and VMAT QC is more advantageous in terms of time-saving and ease of use. Hence, for patient-specific QC, one can use the ion chamber arrays (I’matriXX) or EPID in hospital, but the systems need to be cross-checked.

Keywords

intensity-modulated radiation therapypatient-specific quality controlplan verificationportal imagingvolumetric-modulated arc therapy
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 18 , Issue 1 , March 2019 , pp. 26 - 31
Copyright
© Cambridge University Press 2018 

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Footnotes

Cite this article: Kausar A, Mani KR, Azhari HA, Zakaria GA. (2019) Patient-specific quality control for intensity-modulated radiation therapy and volumetric-modulated arc therapy using electronic portal imaging device and two-dimensional ion chamber array. Journal of Radiotherapy in Practice18: 26–31. doi: 10.1017/S1460396918000328

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