Establishment of criteria for gamma-analysis of individual dose distributions during verification of radiotherapy high-tech treatment plans for cancer patients
https://doi.org/10.29235/1561-8358-2022-67-1-119-128
Abstract
A typical process for verification of treatment plans in intensity-modulated radiation therapy is described. The main errors and uncertainties that arise in the course of planning dose distribution and in the process of dose delivery are listed. Methods for comparing dose distributions are considered: the distance to agreement (DTA) and the test for the algebraic dose difference. Formulas for calculating the shift of points of dose distributions, as well as the minimum value of the shift of points, are provided. The influences of global and local normalization and spatial resolution on the interpretation of the results obtained are defined. A methodology for determining reasonable criteria for gamma-analysis of individual dose distributions when verifying plans for irradiation of cancer patients using high-tech radiation therapy methods has been developed. Using the procedure proposed by the authors to establish action limits and tolerances will make it possible to assess the quality of medical care provided in healthcare institutions when using high-tech radiotherapy methods
About the Authors
M. N. Piatkevich
N. N. Aleksandrov National Cancer Center Republic of Belarus
Belarus
Belarus
Maksim N. Piatkevich – Head of the Department for Engineering Support of Radiation Therapy
agro-town Lesnoy, 223040, Minsk Disrtict, Minsk Region
H. I. Brynkevich
N. N. Aleksandrov National Cancer Center Republic of Belarus
Belarus
Belarus
Hanna I. Brynkevich – Medical Physicist
agrotown Lesnoy, 223040, Minsk Disrtict, Minsk Region
E. V. Titovich
International Atomic Energy Agency
Austria
Austria
Egor V. Titovich – Associate Database Officer (Medical Physics)
PO Box 100, 1400, Vienna
References
1. Miften M., Olch A., Mihailidis D., Moran J., Pawlicki T., Molineu A., Li H., Wijesooriya K., Shi J., Xia P., Papanikolaou N., Low D. A. Tolerance limits and methodologies for IMRT measurement-based verification QA: Recommendations of AAPM Task Group No. 218. Medical Physics, 2018, vol. 45, no. 4, pp. 53–83. https://doi.org/10.1002/mp.12810
2. Zhu Y., Shan D., Bin S, Zhang J., Zhang J., Liu X., Cao K., Cheng S. Dosimetric verification of flattening filter free model based on TrueBeam accelerator using ArcCheck system. Journal of Central South University. Medical Sciences, 2018, vol. 43, no. 8, pp. 864–868 https://doi.org/10.11817/j.issn.1672-7347.2018.08.007
3. Brynkevich H., Titovich E., Piatkevich M. Criteria for evaluating dosimetric verification of treatment plans in radiation therapy with intensity modulation. Saharovskie chteniya 2020 goda: ekologicheskie problemy XXI veka: materialy 20-i mezhdunarodnoy naychnoy konferencii. Chast’ 2 [Sakharov Readings 2020: Environmental Problems of the XXI century: Materials of the 20th International Scientific Conference. Part 2]. Minsk, 2020, pp. 33–36 (in Russian).
4. Masi L., Casamassima F., Doro R., Francescon P. Quality assurance of volumetric modulated arc therapy: evaluation and comparison of different dosimetric systems. Medical Physics, 2011, vol. 38, no. 2, pp. 612–621. https://doi.org/10.1118/1.3533900
5. Sanghangthum T., Suriyapee S., Kim G., Pawlicki T. A method of setting limits for the purpose of quality assurance. Physics in Medicine and Biology, 2013, vol. 58, no. 19, pp. 7025–7037. https://doi.org/10.1088/0031-9155/58/19/7025
6. Podesta M., Nijsten S., Persoon L., Scheib S., Baltes C., Verhaegen F. Time dependent pre-treatment EPID dosimetry for standard and FFF VMAT. Physics in Medicine and Biology, 2014, vol. 59, no. 16, pp. 4749–4768. https://doi.org/10.1088/0031-9155/59/16/4749
7. Chun M., Kim J., Park J. Effect of dose grid resolution on the results of patient-specific quality assurance for intensity-modulated radiation therapy and volumetric modulated arc therapy. International Journal of Radiation Research, 2020, vol. 18, no. 3, pp. 521–530. https://doi.org/10.18869/ACADPUB.IJRR.18.3.521
8. Low D. A., Harms W.B., Mutic S., Purdy J. A technique for the quantitative evaluation of dose distributions. Medical Physics, 1998, vol. 25, no. 5, pp. 656–661. https://doi.org/10.1118/1.598248
9. Stathakis S., Myers P., Esquivel C., Mavroidis P., Papanikolaou N. Characterization of a novel 2D array dosimeter for patient-specific quality assurance with volumetric arc therapy. Medical Physics, 2013, vol. 40, no. 7, pp. 0717311–0717315. https://doi.org/10.1118/1.4812415
10. Wu C., Hosier K., Beck K., Radevic M., Lehmann J., Zhang H., Kroner A., Dutton S., Rosenthal S., Bareng J., Logsdon M., Asche D. On using 3D γ-analysis for IMRT and VMAT pretreatment plan QA. Medical Physics, 2012, vol. 39, no. 6, pp. 3051–3059. https://doi.org/10.1118/1.4711755
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