Abstract
In radiotherapy, quality assurance (QA) for beam delivery from linear accelerator (linac) of treatment machine is a highly crucial factor for accurate radiotherapy because of the fluctuations in the conditions of the machine. The radiation field is one of the important evaluation items, and this has been well-checked by crossline (right-to-left) and inline (caudal-to-cranial) profiles. Diagonal or angular profiles of the radiation field are also an important component of irradiation field; however, these are frequently omitted or not fully taken into account as it requires inefficient measurements. To detect the angular and radial conditions of the radiation field, we proposed a novel evaluation method using Lie derivative analysis against radiochromic film dosimetry in this study. This method directly compared the detected dose distributions with the calculations, obtained the discrepancy of the flow field from the mathematical characteristic of Lie derivative, resulted in a detection of the radial and angular discrepancies that have not been handled by conventional gamma analysis.
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Acknowledgements
The study was financially supported by a Grant-in-Aid for Young Scientists [grant number 18K15650] and [grant number 20K16742] from the Japan Society for Promotion of Science.
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Anetai, Y., Kinami, S., Koike, Y. et al. Novel angular evaluation method for radiation field using Lie derivative. J. Korean Phys. Soc. 81, 1157–1168 (2022). https://doi.org/10.1007/s40042-022-00595-8
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DOI: https://doi.org/10.1007/s40042-022-00595-8