<abstract xmlns="http://www.w3.org/1999/xhtml"><bold>Introduction:</bold> Jaws-Only Intensity modulated radiation therapy (JO-IMRT) is a technique uses the collimator jaws of the linear accelerator (LINAC) to delivery of complex intensity patterns. In previous studies, pretreatment patient specific quality assurance for those JO-IMRT were also performed using ionization chamber, MapCHECK2, and Octavius 4D and good agreements were shown. The aim of this study is to further verify JO-IMRT plans in 2 different cases: one with the gantry angle set equal to beam angle as in the plans and the other with gantry angle set to zero degree.<bold>Materials and Methods:</bold> Twenty-five JO-IMRT, previously verified, were executed twice for each plan. The first one used a real gantry angle, and the second one used a 0° gantry angle. Measurements were performed using Octavius 4D 1500.<bold>Results:</bold> The results were analyzed using Verisoft software. The results show that the Gamma average was 97.32 ± 2.21% for IMRT with a 0° gantry angle and 94.72 ± 2.67% for IMRT with a true gantry angle.<bold>Conclusion:</bold> In both cases, gamma index of more than 90% were found for all of our 25 JO-IMRT treatment plans.</abstract>

Introduction: Jaws-Only Intensity modulated radiation therapy (JO-IMRT) is a technique uses the collimator jaws of the linear accelerator (LINAC) to delivery of complex intensity patterns. In previous studies, pretreatment patient specific quality assurance for those JO-IMRT were also performed using ionization chamber, MapCHECK2, and Octavius 4D and good agreements were shown. The aim of this study is to further verify JO-IMRT plans in 2 different cases: one with the gantry angle set equal to beam angle as in the plans and the other with gantry angle set to zero degree.Materials and Methods: Twenty-five JO-IMRT, previously verified, were executed twice for each plan. The first one used a real gantry angle, and the second one used a 0° gantry angle. Measurements were performed using Octavius 4D 1500.Results: The results were analyzed using Verisoft software. The results show that the Gamma average was 97.32 ± 2.21% for IMRT with a 0° gantry angle and 94.72 ± 2.67% for IMRT with a true gantry angle.Conclusion: In both cases, gamma index of more than 90% were found for all of our 25 JO-IMRT treatment plans.

Evaluation of jaws-only intensity modulated radiation therapy treatment plans using Octavius 4D system

Department of Radiation Oncology, Dong Nai General Hospital

Polish Journal of Medical Physics and Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Introduction: Jaws-Only Intensity modulated radiation therapy (JO-IMRT) is a technique uses the collimator jaws of the linear accelerator (LINAC) to delivery...

Evaluation of jaws-only intensity modulated radiation therapy treatment plans using Octavius 4D system

Published Online: Jun 26, 2018

Page range: 75 - 78

Received: Dec 01, 2017

Accepted: Apr 18, 2018

DOI: https://doi.org/10.2478/pjmpe-2018-0010

Keywords
intensity-modulated radiation therapy (IMRT), jaws only IMRT (JO-IMRT), quality assurance (QA), Octavius 4D, MapCHECK2

© 2018 Duong Thanh Tai et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Evaluation of jaws-only intensity modulated radiation therapy treatment plans using Octavius 4D system

Published Online: Jun 26, 2018

Page range: 75 - 78

Received: Dec 01, 2017

Accepted: Apr 18, 2018

DOI: https://doi.org/10.2478/pjmpe-2018-0010

Keywordsintensity-modulated radiation therapy (IMRT), jaws only IMRT (JO-IMRT), quality assurance (QA), Octavius 4D, MapCHECK2

© 2018 Duong Thanh Tai et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
intensity-modulated radiation therapy (IMRT), jaws only IMRT (JO-IMRT), quality assurance (QA), Octavius 4D, MapCHECK2