Cargando…
Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy
INTRODUCTION: Clinical evaluation of a two-dimensional (2D) liquid-filled ion chamber detector array used in the verification of highly modulated small beams of stereotactic body radiation therapy (SBRT) has been conducted. MATERIALS AND METHODS: Measurements with the Octavius 1000 SRS (PTW, Freibur...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Wolters Kluwer - Medknow
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6580813/ https://www.ncbi.nlm.nih.gov/pubmed/31359926 http://dx.doi.org/10.4103/jmp.JMP_4_19 |
_version_ | 1783428093314072576 |
---|---|
author | Markovic, Miljenko Narayanasamy, Ganesh Stathakis, Sotirios Mavroidis, Panayiotis Jurkovic, Ines-Ana Saenz, Daniel Papanikolaou, Niko |
author_facet | Markovic, Miljenko Narayanasamy, Ganesh Stathakis, Sotirios Mavroidis, Panayiotis Jurkovic, Ines-Ana Saenz, Daniel Papanikolaou, Niko |
author_sort | Markovic, Miljenko |
collection | PubMed |
description | INTRODUCTION: Clinical evaluation of a two-dimensional (2D) liquid-filled ion chamber detector array used in the verification of highly modulated small beams of stereotactic body radiation therapy (SBRT) has been conducted. MATERIALS AND METHODS: Measurements with the Octavius 1000 SRS (PTW, Freiburg, Germany) detector with 977 liquid-filled ion chambers were compared against EDR2 film and PTW Octavius Seven29. The performance of detector array has been evaluated on ten SBRT patient plans. Dose profiles of individual and composite fields' calculated using Pinnacle(3) treatment planning system were compared against measurements with Octavius 1000 SRS detector array, EDR2 film, and Octavius Seven29 detector. Gamma index and profile comparison were used in the evaluation and assessment of the detector's performance. RESULTS: The Gamma index measurements show agreement between Pinnacle(3) computations and Octavius 1000 SRS array, PTW Octavius Seven29, and EDR2 film for >90% of the points using 2%, 2 mm tolerance criteria. Profiles obtained with the Octavius 1000 SRS were in agreement with the EDR2 film profiles, demonstrating the detector's superior sampling rate. CONCLUSIONS: The Octavius 1000 SRS is a dosimetrically accurate device to perform quality assurance checks in SBRT treatments. The broad range of measurements performed in this study quantified the dosimetric accuracy of Octavius 1000 SRS detector in the clinical setup of the small fields in radiotherapy. |
format | Online Article Text |
id | pubmed-6580813 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Wolters Kluwer - Medknow |
record_format | MEDLINE/PubMed |
spelling | pubmed-65808132019-07-29 Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy Markovic, Miljenko Narayanasamy, Ganesh Stathakis, Sotirios Mavroidis, Panayiotis Jurkovic, Ines-Ana Saenz, Daniel Papanikolaou, Niko J Med Phys Original Article INTRODUCTION: Clinical evaluation of a two-dimensional (2D) liquid-filled ion chamber detector array used in the verification of highly modulated small beams of stereotactic body radiation therapy (SBRT) has been conducted. MATERIALS AND METHODS: Measurements with the Octavius 1000 SRS (PTW, Freiburg, Germany) detector with 977 liquid-filled ion chambers were compared against EDR2 film and PTW Octavius Seven29. The performance of detector array has been evaluated on ten SBRT patient plans. Dose profiles of individual and composite fields' calculated using Pinnacle(3) treatment planning system were compared against measurements with Octavius 1000 SRS detector array, EDR2 film, and Octavius Seven29 detector. Gamma index and profile comparison were used in the evaluation and assessment of the detector's performance. RESULTS: The Gamma index measurements show agreement between Pinnacle(3) computations and Octavius 1000 SRS array, PTW Octavius Seven29, and EDR2 film for >90% of the points using 2%, 2 mm tolerance criteria. Profiles obtained with the Octavius 1000 SRS were in agreement with the EDR2 film profiles, demonstrating the detector's superior sampling rate. CONCLUSIONS: The Octavius 1000 SRS is a dosimetrically accurate device to perform quality assurance checks in SBRT treatments. The broad range of measurements performed in this study quantified the dosimetric accuracy of Octavius 1000 SRS detector in the clinical setup of the small fields in radiotherapy. Wolters Kluwer - Medknow 2019 /pmc/articles/PMC6580813/ /pubmed/31359926 http://dx.doi.org/10.4103/jmp.JMP_4_19 Text en Copyright: © 2019 Journal of Medical Physics http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms. |
spellingShingle | Original Article Markovic, Miljenko Narayanasamy, Ganesh Stathakis, Sotirios Mavroidis, Panayiotis Jurkovic, Ines-Ana Saenz, Daniel Papanikolaou, Niko Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy |
title | Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy |
title_full | Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy |
title_fullStr | Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy |
title_full_unstemmed | Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy |
title_short | Clinical Evaluation of a Two-dimensional Liquid-Filled Ion chamber Detector Array for Verification of High Modulation Small Fields in Radiotherapy |
title_sort | clinical evaluation of a two-dimensional liquid-filled ion chamber detector array for verification of high modulation small fields in radiotherapy |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6580813/ https://www.ncbi.nlm.nih.gov/pubmed/31359926 http://dx.doi.org/10.4103/jmp.JMP_4_19 |
work_keys_str_mv | AT markovicmiljenko clinicalevaluationofatwodimensionalliquidfilledionchamberdetectorarrayforverificationofhighmodulationsmallfieldsinradiotherapy AT narayanasamyganesh clinicalevaluationofatwodimensionalliquidfilledionchamberdetectorarrayforverificationofhighmodulationsmallfieldsinradiotherapy AT stathakissotirios clinicalevaluationofatwodimensionalliquidfilledionchamberdetectorarrayforverificationofhighmodulationsmallfieldsinradiotherapy AT mavroidispanayiotis clinicalevaluationofatwodimensionalliquidfilledionchamberdetectorarrayforverificationofhighmodulationsmallfieldsinradiotherapy AT jurkovicinesana clinicalevaluationofatwodimensionalliquidfilledionchamberdetectorarrayforverificationofhighmodulationsmallfieldsinradiotherapy AT saenzdaniel clinicalevaluationofatwodimensionalliquidfilledionchamberdetectorarrayforverificationofhighmodulationsmallfieldsinradiotherapy AT papanikolaouniko clinicalevaluationofatwodimensionalliquidfilledionchamberdetectorarrayforverificationofhighmodulationsmallfieldsinradiotherapy |