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Monte-Carlo calculation of output correction factors for ionization chambers, solid-state detectors, and EBT3 film in small fields of high-energy photonsстатья
- Авторы: Klimanov V.A., Kirpichev Y.S., Serikbekova S.K., Belousov A.V., Krusanov G.A., Walwyn-Salas G., Morozov V.N., Kolyvanova M.A.
- Журнал: Journal of applied clinical medical physics / American College of Medical Physics
- Год издания: 2022
- Издательство: American College of Medical Physics
- Местоположение издательства: Reston, VA, United States
- Первая страница: 1
- Последняя страница: 12
- DOI: 10.1002/acm2.13753
- Аннотация: High-energy accelerators are often used in oncological practice, but the infor-mation on the small-field dosimetry for the photon beams with nominal energyabove 10 MV is limited. The goal of the present work was to determine the val-ues of the output correction factor (kfclin,frefQclin,Qref) for solid-state detectors (Diode E,PTW 60017; microDiamond, PTW 60019), EBT3 film, and ionization chambers(Semiflex,PTW 31010;Semiflex 3D,PTW 31021;PinPoint,PTW 31015;PinPoint3D, PTW 31016) in the small fields formed by 10, 15, 18, and 20 MV photonbeams. The output correction factors were calculated by Monte-Carlo methodusing EGSnrc toolkit for six field sizes (from 0.5×0.5cm2to 10×10 cm2)for isocentric and constant source-to-surface distance (SSD) techniques. Thedecrease in the field size led to an increase inkfclin,frefQclin,Qreffor ionization chambers,while for solid-state detectors and radiochromic film,kfclin,frefQclin,Qrefwere less thanunity at the smallest field size. A larger sensitive volume of ionization cham-ber corresponded to a stronger deviation of output correction factor from unity:1.847 (125 mm3PTW 31010) versus up to 1.183 (16 mm3PTW 31016) at thesmallest field of 10 MV beam. The calculated output correction factors wereused to correct the output factors for PTW 60017, PTW 60019, and EBT3. Thedeviation of the corrected output factor from the results of Monte-Carlo simu-lation did not exceed 3% in the fields from 1.0×1.0cm2to 4.0×4.0cm2for10 and 18 MV beams. Thus, Diode E, microDiamond, and EBT3 film can berecommended for small-field dosimetry of high-energy photons.
- Добавил в систему: Белоусов Александр Витальевич