지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
In proton radiotherapy, the dosimetry protocol TRS-398 does not provide the beam quality correction factors k<SUB>Q,Q0</SUB> for all areas of the spread out Bragg peak (SOBP). Monte Carlo simulations using the TOPAS simulation toolkit were performed to calculate the beam quality correction factors at various depths of the SOBP to observe any variations. The SOBP of the generated proton beam had a range of 15 cm and a width of 15 cm. The beam quality correction factors k<SUB>Q,Q0</SUB> were calculated not only at the reference depth of 7.5 g/cm² recommended by TRS-398 but also at depths of 4 g/cm² and 13 g/cm². The comparison of the simulation results for the absorbed dose with actual measurements showed a slight difference at the surface above the water phantom, but the width of the SOBP was well matched with a difference of less than 1%. The k<SUB>Q,Q0</SUB> factor calculated at the reference depth of 7.5 g/cm² was 1.045, which is within the error range of the value of 1.030 provided by the TRS-398 protocol. The k<SUB>Q,Q0</SUB> factors calculated at the depths of 4 g/cm² and 13 g/cm² were 1.041 and 1.048, respectively. While all the calculated values were within the error range of the value suggested by TRS-398, the observed increase in the k<SUB>Q,Q0</SUB> factor with increasing depth suggests that a position-dependent beam quality correction factor determined through precise measurements may be required to calculate the correct dose.
목차
I. Introduction
II. Beam quality correction factor kQ;Q0
III. Simulation method
IV. Results and discussion
V. Conclusion
REFERENCES
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