Independent verification of treatment planning system calculations

• Autorzy: Dąbrowska-Szewczyk Edyta , Zawadzka Anna , Brzozowska Beata , Walewska Agnieszka , Kukołowicz Paweł

Identyfikatory

DOI

10.2478/nuka-2021-0006

• Języki publikacji: EN

Abstrakty

EN

Purpose: According to the available international recommendations, at least one independent verifi cation 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 methods: 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. Results: 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 (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. Conclusions: OMP calculations were introduced as the independent MU verification tool with the first action level range equal to 3.5%.

Słowa kluczowe

EN

3D-conformal radiotherapy; treatment planning system; quality control; validation of dose calculation; pre-treatment verification

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2021
• Tom: Vol. 66, No. 2
• Strony: 47--53
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Dąbrowska-Szewczyk Edyta

• Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology Department of Medical Physics W. K. Roentgena 5 Str., 02-781 Warsaw, Poland
• University of Warsaw Faculty of Physics, Biomedical Physics Division Pasteura 5 Str., 02-093 Warsaw, Poland

• https://orcid.org/0000-0002-4193-8471

autor

Zawadzka Anna

• Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology Department of Medical Physics W. K. Roentgena 5 Str., 02-781 Warsaw, Poland

• https://orcid.org/0000-0003-0757-0869

autor

Brzozowska Beata

• University of Warsaw Faculty of Physics, Biomedical Physics Division Pasteura 5 Str., 02-093 Warsaw, Poland

• https://orcid.org/0000-0003-0247-697X

autor

Walewska Agnieszka

• Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology Department of Medical Physics W. K. Roentgena 5 Str., 02-781 Warsaw, Poland

• https://orcid.org/0000-0002-3645-3736

autor

Kukołowicz Paweł

• Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology Department of Medical Physics W. K. Roentgena 5 Str., 02-781 Warsaw, Poland

• https://orcid.org/0000-0001-9050-0161

Bibliografia

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• 2. Knöös, T., Johnsson, S. A., Ceberg, C. P., Tomaszewicz, A., & Nilsson, P. (2001). Independent checking of the delivered dose for high-energy X-rays using a hand-held PC. Radiother. Oncol., 58(2), 201–208.
• 3. Polish Minister of Health. (2011). Regulation of the Minister of Health of 18 February 2011 on the conditions for safe use of ionizing radiation for all types of medical exposure. Dz. U., 2011, no. 51, item 265. (in Polish).
• 4. Haslam, J. J., Bonta, D. V., Lujan, A. E., Rash, C., Jackson, W., & Roeske, J. C. (2003). Comparison of dose calculated by an intensity modulated radiotherapy treatment planning system and an independent monitor unit verifi cation program. J. Appl. Clin. Med. Phys., 4(3), 224–230.
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• 11. Sievinen, J., Ulmer, W., & Kaissl, W. (2005). AAA Photon dose calculation model in Eclipse. Varian Medical Systems.
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• 13. Bulski, W., Chełmiński, K., & Rostkowska, J. (2015). Dosimetry audit of radiotherapy treatment planning systems. Radiat. Prot. Dosim., 165(1/4), 472–476.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).