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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
오류제보하기
The scatter photons and photoneutrons from high energy photon beams (more than 10 MV) will increase the undesired dose to the patient and the staff working in linear accelerator room. This undesired dose which is found at out-of-field area can increase the probability of secondary malignancy. The purpose of this study is to determine the equivalent dose of scatter photons and neutrons generated by 3 different treatment techniques: 3D-conformal, intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT). The measurement was performed using two types of the optically stimulation luminescence detectors (OSL and OSLN) in the Alderson Rando phantom that was irradiated by 3 different treatment techniques following the actual prostate cancer treatment plans. The scatter photon and neutron equivalent dose were compared among the 3 treatments techniques at the surface in the out-of-field area and the critical organs. Maximum equivalent dose of scatter photons and neutrons was found when using the IMRT technique. The scatter neutrons showed average equivalent doses of 0.26, 0.63 and $0.31mSv{\cdot}Gy^{-1}$ at abdominal surface region which was 20 cm from isocenter for 3D, IMRT and VMAT, respectively. The scattered photons equivalent doses were 6.94, 10.17 and $6.56mSv{\cdot}Gy^{-1}$ for 3D, IMRT and VMAT, respectively. For the 5 organ dose measurements, the scattered neutron and photon equivalent doses in out of field from the IMRT plan were highest. The result revealed that the scatter equivalent doses for neutron and photon were higher for IMRT. So the suitable treatment techniques should be selected to benefit the patient and the treatment room staff.
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등록된 정보가 없습니다.
참고문헌 (15)
참고문헌 신청
Chibani O / 2003 / Photonuclear dose calculations for high-energy photon beams from Siemens and Varian linacs / Med Phys 30:1990~2000
Followill D / 1997 / Estimates of wholebody equivalent produced by beam intensity modulated conformal therapy / Int J Radiat Oncol Bio Phys 38(3):667~672
Reft CS / 2006 / In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing 18 MV IMRT / Med Phys 33(10):3734~3742
Howell RM / 2009 / Secondary neutron spectra from modern Varian, Siemens, and Elektalinacs with multileaf collimators / Med Phys 36(9):4027~4038
Nedaie HA / 2014 / Neutron dose measurements of Varian and Elektalinacs by TLD600 and TLD700 dosimeters and comparison with MCNP calculations / Med Phys 39(1):10~17
Followill D / 1997 / Estimates of wholebody equivalent produced by beam intensity modulated conformal therapy / Int J Radiat Oncol Bio Phys 38(3):667~672
Reft CS / 2006 / In vivo and phantom measurements of the secondary photon and neutron doses for prostate patients undergoing 18 MV IMRT / Med Phys 33(10):3734~3742
Howell RM / 2009 / Secondary neutron spectra from modern Varian, Siemens, and Elektalinacs with multileaf collimators / Med Phys 36(9):4027~4038
Nedaie HA / 2014 / Neutron dose measurements of Varian and Elektalinacs by TLD600 and TLD700 dosimeters and comparison with MCNP calculations / Med Phys 39(1):10~17
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