open access

Vol 19, No 3 (2014)
Published online: 2014-05-01
Submitted: 2013-01-22
Get Citation

An institutional experience of quality assurance of a treatment planning system on photon beam

Yıldıray Özgüven, Kadir Yaray, Fadime Alkaya, Birsen Yücel, Serdar Soyuer
DOI: 10.1016/j.rpor.2013.10.008
·
Rep Pract Oncol Radiother 2014;19(3):195-205.

open access

Vol 19, No 3 (2014)
Published online: 2014-05-01
Submitted: 2013-01-22

Abstract

Aim

The purpose of the present study is to show the application of the IAEA TRS-430 QA procedures of Eclipse™v7.5 TPS for photon energies. In addition, the trends of the deviations found in the conducted tests were determined.

Background

In the past, the lack of complete TPS QA procedures led to some serious accidents. So, QA in the radiotherapy treatment planning process is essential for determination of accuracy in the radiotherapy process and avoidance of treatment errors.

Materials and methods

The calculations of TPS and measurements of irradiations of the treatment device were compared in the study. As a result, the local dose deviation values (δ1: central beam axis, δ2: penumbra and build up region, δ3: inside field, δ4: outside beam edges, δ50–90: beam fringe, RW50: radiological width) and their confidence limit values (including systematic and random errors) were obtained.

Results

The confidence limit values of δ4 were detected to increase with expanding field size. The values of δ1 and δ3 of hard wedge were larger than open fields. The values of δ2 and δ50–90 of the inhomogeneity effect test were larger, especially than other tests of this study. The average deviation was showed to increase with the rise of the wedge angle. The values of δ3 and δ4 of lung irradiation were outside tolerance.

Conclusions

The QA of TPS was done and it was found that there were no reservations in its use in patient treatment. The trend of the deviations is shown.

Abstract

Aim

The purpose of the present study is to show the application of the IAEA TRS-430 QA procedures of Eclipse™v7.5 TPS for photon energies. In addition, the trends of the deviations found in the conducted tests were determined.

Background

In the past, the lack of complete TPS QA procedures led to some serious accidents. So, QA in the radiotherapy treatment planning process is essential for determination of accuracy in the radiotherapy process and avoidance of treatment errors.

Materials and methods

The calculations of TPS and measurements of irradiations of the treatment device were compared in the study. As a result, the local dose deviation values (δ1: central beam axis, δ2: penumbra and build up region, δ3: inside field, δ4: outside beam edges, δ50–90: beam fringe, RW50: radiological width) and their confidence limit values (including systematic and random errors) were obtained.

Results

The confidence limit values of δ4 were detected to increase with expanding field size. The values of δ1 and δ3 of hard wedge were larger than open fields. The values of δ2 and δ50–90 of the inhomogeneity effect test were larger, especially than other tests of this study. The average deviation was showed to increase with the rise of the wedge angle. The values of δ3 and δ4 of lung irradiation were outside tolerance.

Conclusions

The QA of TPS was done and it was found that there were no reservations in its use in patient treatment. The trend of the deviations is shown.

Get Citation

Keywords

Treatment planning system; Quality assurance; Local dose deviation; Confidence limit; Photon beam

About this article
Title

An institutional experience of quality assurance of a treatment planning system on photon beam

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 19, No 3 (2014)

Pages

195-205

Published online

2014-05-01

DOI

10.1016/j.rpor.2013.10.008

Bibliographic record

Rep Pract Oncol Radiother 2014;19(3):195-205.

Keywords

Treatment planning system
Quality assurance
Local dose deviation
Confidence limit
Photon beam

Authors

Yıldıray Özgüven
Kadir Yaray
Fadime Alkaya
Birsen Yücel
Serdar Soyuer

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