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- W2168825669 abstract "Background: Making use of the orthovoltage machines in Radiotherapy, is one of the rouƟ ne methods for the treatment of the superficial lesions. In this study, an important determinant of X-ray quality, the HVL (Half Value Layer), has been evaluated. Materials and Methods: The HVLs of a orthovoltage X- ray machine in 120 and 180 kVp are measured, using an empirical method, in which the HVLs are derived from the absorpƟ on curves. The measured HVLs are compared with calculated (Monte Carlo simulaƟ on) HVLs. Using the BEAMDP code of simulaƟ on, the output spectra are obtained and employed for the measurement of the HVLs. Results: Comparing the calculated and measured HVL values, the results show that the highest and lowest differences between the two are 4.96% and 2.27%, respecƟ vely, which are, in fairly good agreement with those obtained in the former studies. Conclusion: This study shows that the EGSnrc simulaƟ on code is capable of being used for the extracƟ on of the quality indices for the superficial X-ray radiotherapy machines. It seems that, the menƟ oned code, with the menƟ oned experimental method, can be employed as a rouƟ ne clinical test tool for every superficial radiotherapy department." @default.
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- W2168825669 date "2014-10-15" @default.
- W2168825669 modified "2023-09-26" @default.
- W2168825669 title "HVL evaluation of orthovoltage X-ray machine using EGSnrc code of simulation" @default.
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