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• W2976018959 abstract "Background: The present study aimed to introduce a rapid transmission dosimetry through an electronic portal-imaging device (EPID) to achieve two-dimensional (2D) dose distribution for homogenous environments.Material and Methods: In this Phantom study, first, the EPID calibration curve and correction coefficients for field size were obtained from EPID and ionization chamber. Second, the EPID off-axis pixel response was measured, and the grey-scale image of the EPID was converted into portal dose image using the calibration curve. Next, the scattering contribution was calculated to obtain the primary dose. Then, by means of a verified back-projection algorithm and the Scatter-to-Primary dose ratio, a 2D dose distribution at the mid-plane was obtained.Results: The results obtained from comparing the transmitted EPID dosimetry to the calculated dose, using commercial treatment planning system with gamma function while there is 3% dose difference and 3mm distance to agreement criteria, were in a good agreement. In addition, the pass rates of γ < 1 was 94.89% for the homogeneous volumes.Conclusion: Based on the results, the method proposed can be used in EPID dosimetry." @default.
• W2976018959 created "2019-10-03" @default.
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• W2976018959 date "2019-09-28" @default.
• W2976018959 modified "2023-09-27" @default.
• W2976018959 title "An Empirical Transmitted EPID Dosimetry Method using a Back- Projection Algorithm" @default.
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• W2976018959 doi "https://doi.org/10.31661/jbpe.v0i0.1082" @default.
• W2976018959 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6820021" @default.
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• W2976018959 hasPublicationYear "2019" @default.
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