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Monte Carlo Finite-Size Pencil Beam Dose Calculation Engine for Accurate Radiotherapy

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H Zheng

H Zheng*, H Wang , R Cao , J Song , T He , Y Wu ,1.Key Laboratory of Neutronics and Radiation Safety, Institute of Nuclear Energy Safety Technology,Chinese Academy of Sciences, Hefei, Anhui, 230031, China;2. Anhui Radiotherapy Engineering Technology Research Center, Hefei, Anhui, 230031, China;3. Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou, Jiangsu, 215006, China


SU-I-GPD-T-417 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: Dose calculation engine is one of the core modules in Treatment Planning System (TPS). This study mainly focuses on the photon dose calculation engine based on the Monte Carlo Finite-Size Pencil Beam (MCFSPB) model in the Accurate Radiation Therapy System (KylinRay-IMRT).

Methods: The acquisition of pencil beam kernel is one of the most important steps in the MCFSPB model. By analyzing the demerits of the clinical pencil beam dose calculation methods, a new pencil beam kernel model was developed based on the MC simulation and the technology of medical accelerator energy spectrum reconstruction. According to the axial symmetry principle, only part of simulation results was used for the data of pencil beam kernel, which greatly reduced the data size of the pencil beam. Based on the above studies, a dose calculation engine based on MCFSPB model was designed and implemented in KylinRay-IMRT with Visual C++.

Results: The accuracy tests were carried out with the American Association of Physicists in Medicine (AAPM) Task Group 119 Report samples. The deviations of the plan dose and dose measured by ionization chamber are less than 3.6%. The γ-index passing rates for single beam were more than 94.0%, and γ-index passing rates for component beams were more than 90.0%. To verify the feasibility and accuracy of KylinRay-IMRT, a series of tests including different parts of clinical cases compared with other TPS (such as Pinnacle) were performed. The results showed that the calculated precision of MCFSPB dose calculation engine is very good.

Conclusion: The dose calculation engine based on MCFSPB model met the clinical criteria, and had been used as a fast and accurate dose calculation engine for radiotherapy. Some advanced functions, such as fast MC dose calculation engine, are under development.

Funding Support, Disclosures, and Conflict of Interest: National Natural Science Foundation of China (11605233)

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