Implementation of the Sievert integral for the calculation of dose distribution around the BEBIG Co-60 high dose rate brachytherapy source

• Autorzy: Dumenya Castrol , Hasford Francis , Tagoe Samuel Nii Adu , Sasu Evans , Pokoo-Aikins Mark , Asamanyuah Belinda Buermle , Amuasi John Humphrey

Identyfikatory

DOI

10.2478/pjmpe-2022-0011

• Języki publikacji: EN

Abstrakty

EN

Introduction: In radiotherapy, a computerized treatment planning system (TPS) is used for performing treatment planning to estimate the dose distribution within a patient. To simplify the dose calculation, mathematical algorithms are employed. TG43 formalism is widely used for brachytherapy. Before the implementation of a particular dose calculation algorithm in clinical practice, it is imperative to acknowledge the limitations and uncertainties associated with the algorithm. Regarding this, outputs of the algorithm are compared to measurements or dose calculation approaches using simple source placement geometries. The manual dose calculation method has to be robust, straightforward, and devoid of complexities to reduce the likelihood of committing errors in the dose calculation process. A lot of manual dose calculation approaches have been proposed for Brachytherapy sources, but one needs to ascertain their reliability. Material and methods: Considering this, the output of an HDRplus treatment planning system dedicated to brachytherapy treatment planning and using the TG43 formalism to calculate the dose distribution around a BEBIG Co-60 source was validated with Sievert integral dose calculation approach. Simple source placement geometries were created with the TPS using the universal applicator, LLA1200-20, selected from the applicator library, and doses at various equidistant points from the applicator calculated with the TPS and the Sievert integral. Various steps to enhance the efficacy of the Sievert integral approach have been outlined. Results: The doses compared favourably well with deviations ranging from 0.03 – 10.51% (mean of 3.13%), and 0.03 – 5.63% (mean of 2.55%) for angles along the perpendicular bisector of the source, ranging from 0° < θ < 70° and 0° < θ < 48°, respectively. Conclusions: The Sievert integral breaks down at angles: θ ≥ 60°, and therefore, neglecting large angles, the Sievert integral would be an efficient, effective, and valid tool for quality control of the HDRplus TPS for the Co-60 source.

Słowa kluczowe

EN

dose calculation; high dose rate brachytherapy; cobalt-60; Sievert integral; BEBIG

• Wydawca: Polskie Towarzystwo Fizyki Medycznej ; De Gruyter
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2022
• Tom: Vol. 28, Iss. 2
• Strony: 90--98
• Opis fizyczny: Bibliogr. 15 poz., rys., tab.

Twórcy

autor

Dumenya Castrol

• Department of Medical Physics, Graduate School of Nuclear and Allied Sciences, University of Ghana, Ghana

• https://orcid.org/0000-0001-8936-262X

autor

Hasford Francis

• Department of Medical Physics, Graduate School of Nuclear and Allied Sciences, University of Ghana, Ghana
• Radiological and Medical Sciences Research Institute, Ghana Atomic Energy Commission, Ghana

• https://orcid.org/0000-0003-0252-8004

autor

Tagoe Samuel Nii Adu

• Department of Medical Physics, Graduate School of Nuclear and Allied Sciences, University of Ghana, Ghana
• National Center for Radiotherapy and Nuclear Medicine, Korle Bu Teaching Hospital, Ghana

• https://orcid.org/0000-0002-2515-5303

autor

Sasu Evans

• National Center for Radiotherapy and Nuclear Medicine, Korle Bu Teaching Hospital, Ghana

autor

Pokoo-Aikins Mark

• Department of Medical Physics, Graduate School of Nuclear and Allied Sciences, University of Ghana, Ghana
• Radiological and Medical Sciences Research Institute, Ghana Atomic Energy Commission, Ghana

• https://orcid.org/0000-0003-0366-6708

autor

Asamanyuah  Belinda Buermle

• Radiological Applications Department, Nuclear Regulatory Authority, Ghana
• Department of Medical Physics, Graduate School of Nuclear and Allied Sciences, University of Ghana, Ghana

autor

Amuasi John Humphrey

• Department of Medical Physics, Graduate School of Nuclear and Allied Sciences, University of Ghana, Ghana

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).