Dosimetry audit of the CyberKnife accelerator with the SHANE phantom

• Autorzy: Szymański Marcin , Piziorska Maria , Madetko Oskar , Ślusarczyk-Kacprzyk Wioletta , Bulski Wojciech

Identyfikatory

DOI

10.2478/pjmpe-2021-0025

• Języki publikacji: EN

Abstrakty

EN

Introduction: The aim of this study was to propose a dosimetric audit of the CyberKnife system. Dosimetry audit is an important part of the quality assurance process in radiotherapy. Most of the proposed dosimetric audits are dedicated to classical medical accelerators. Currently, there is no commonly implemented scheme for conducting a dosimetric audit of the CyberKnife accelerator. Material and methods: To verify the dosimetric and geometric parameters of the entire radiotherapy process, as is required in E2E test procedure, the CIRS SHANE anthropomorphic phantom was used. A tomography with a resolution of 1.5 mm was prepared, five PTVs (Planning Target Volume) of different volumes were drawn; approximately: 88 cm3, 44 cm3, 15 cm3, 7 cm3, 1.5 cm3. Five treatment plans were made using the 6D Skull tracking method, FIXED collimators, RayTracing algorithm. Each treatment plan was verified in a slab Phantom, with a PinPoint chamber. The dose was measured by an ionization chamber type TM31010 Semiflex, placed in the center area of the target. Results: The result of the QA verification in slab phantom was up to 5,0%. The percentage difference for the measurement in the SHANE phantom was: 4.29%, -1.42%, -0.70%, 1.37%, -1.88% respectively for the targets: 88 cm3, 44 cm3, 15 cm3, 7 cm3, 1.5 cm3. Conclusions: By analyzing various approaches to small-field dosimetry audits in the literature, it can be assumed that the proposed CyberKnife dosimetric audit using the SHANE phantom is an appropriate method of verification of the radiotherapy process. Particular attention should be paid to the target volume, adjusting it to the system capabilities.

Słowa kluczowe

EN

CyberKnife; audit; dosimetry; SHANE; quality assurance

• Wydawca: Polskie Towarzystwo Fizyki Medycznej ; De Gruyter
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2021
• Tom: Vol. 27, Iss. 3
• Strony: 207--212
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Szymański Marcin

• Masovian Oncology Hospital, Wieliszew, Poland

autor

Piziorska Maria

• Masovian Oncology Hospital, Wieliszew, Poland

autor

Madetko Oskar

• Masovian Oncology Hospital, Wieliszew, Poland

autor

Ślusarczyk-Kacprzyk Wioletta

• Maria Skłodowska-Curie National Research Instiute of Oncology, Warsaw, Poland

autor

Bulski Wojciech

• Maria Skłodowska-Curie National Research Instiute of Oncology, Warsaw, Poland

Bibliografia

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Uwagi

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