<abstract xmlns="http://www.w3.org/1999/xhtml"><sec><h3>Purpose</h3><p>According to the available international recommendations, at least one independent verification of the calculations of number of monitor unit (MU) is required for every patient treated by teleradiotherapy. The aim of this study was to estimate the differences of dose distributions calculated with two treatment planning systems: Eclipse (Varian) and Oncentra MasterPlan (Elekta).</p></sec><sec><h3>Materials and methods</h3><p>The analysis was performed for 280 three-dimensional conformal radiotherapy treatment (3D-CRT) plans with photon beams from Varian accelerators: CL 600C/D X6 MV (109 plans), CL 2300C/D X6 MV (43 plans), and CL 2300C/D X15 MV (128 plans). The mean doses in the planning target volume (PTV) and doses at the isocenter point obtained with Eclipse and Oncentra MasterPlan (OMP) were compared with Wilcoxon matched-pairs signed rank test. Additionally, the treatment planning system (TPS) calculations were compared with dosimetric measurements performed in the inhomogeneous phantom.</p></sec><sec><h3>Results</h3><p>Data were analysed for 6 MV plans and for 15 MV plans separately, independently of the treatment machine. The dose values calculated in Eclipse were significantly (<italic>p</italic> &lt;0.001) higher compared to calculations of OMP system. The average difference of the mean dose to PTV was (1.4 ± 1.0)% for X6 MV and (2.5 ± 0.6)% for X15 MV. Average dose disparities at the isocenter point were (1.3 ± 1.9)% and (2.1 ± 1.0)% for X6 MV and X15 MV beams, respectively. The largest differences were observed in lungs, air cavities, and bone structures. Moreover the variation in dosimetric measurements was less as compared to Eclipse calculations.</p></sec><sec><h3>Conclusions</h3><p>OMP calculations were introduced as the independent MU verification tool with the first action level range equal to 3.5%.</p></sec></abstract>

PurposeAccording to the available international recommendations, at least one independent verification of the calculations of number of monitor unit (MU) is required for every patient treated by teleradiotherapy. The aim of this study was to estimate the differences of dose distributions calculated with two treatment planning systems: Eclipse (Varian) and Oncentra MasterPlan (Elekta).Materials and methodsThe analysis was performed for 280 three-dimensional conformal radiotherapy treatment (3D-CRT) plans with photon beams from Varian accelerators: CL 600C/D X6 MV (109 plans), CL 2300C/D X6 MV (43 plans), and CL 2300C/D X15 MV (128 plans). The mean doses in the planning target volume (PTV) and doses at the isocenter point obtained with Eclipse and Oncentra MasterPlan (OMP) were compared with Wilcoxon matched-pairs signed rank test. Additionally, the treatment planning system (TPS) calculations were compared with dosimetric measurements performed in the inhomogeneous phantom.ResultsData were analysed for 6 MV plans and for 15 MV plans separately, independently of the treatment machine. The dose values calculated in Eclipse were significantly (p <0.001) higher compared to calculations of OMP system. The average difference of the mean dose to PTV was (1.4 ± 1.0)% for X6 MV and (2.5 ± 0.6)% for X15 MV. Average dose disparities at the isocenter point were (1.3 ± 1.9)% and (2.1 ± 1.0)% for X6 MV and X15 MV beams, respectively. The largest differences were observed in lungs, air cavities, and bone structures. Moreover the variation in dosimetric measurements was less as compared to Eclipse calculations.ConclusionsOMP calculations were introduced as the independent MU verification tool with the first action level range equal to 3.5%.

Independent verification of treatment planning system calculations

Maria Sklodowska-Curie Memorial Cancer, Center and Institute of Oncology, Department of Medical Physics

Faculty of Physics, Biomedical Physics Division

Nukleonika

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

{"article-title":"Independent verification of treatment planning system calculations"}

PurposeAccording to the available international recommendations, at least one independent verification of the calculations of number of monitor unit (MU) is...

Independent verification of treatment planning system calculations

Article Category: Original Paper

Publié en ligne: 08 juin 2021

Pages: 47 - 53

Reçu: 10 avr. 2019

Accepté: 02 nov. 2020

DOI: https://doi.org/10.2478/nuka-2021-0006

Mots clés
3D-conformal radiotherapy, Treatment planning system, Quality control, Validation of dose calculation, Pre-treatment verification

© 2021 Edyta Dąbrowska-Szewczyk et al., published by Sciendo

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

Independent verification of treatment planning system calculations

Article Category: Original Paper

Publié en ligne: 08 juin 2021

Pages: 47 - 53

Reçu: 10 avr. 2019

Accepté: 02 nov. 2020

DOI: https://doi.org/10.2478/nuka-2021-0006

Mots clés3D-conformal radiotherapy, Treatment planning system, Quality control, Validation of dose calculation, Pre-treatment verification

© 2021 Edyta Dąbrowska-Szewczyk et al., published by Sciendo

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

Mots clés
3D-conformal radiotherapy, Treatment planning system, Quality control, Validation of dose calculation, Pre-treatment verification