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.
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초록· 키워드
오류제보하기
To quantitatively evaluate how setup errors in conjunction with dose gradients contribute to the error in IMRT dose quality assurance (DQA) measurements. The control group consisted of 5 DQA plans of which all individual field dose differences were less than ${\pm}5%$. On the contrary, the examination group was composed of 16 DQA plans where any individual field dose difference was larger than ${\pm}10%$ even though their total dose differences were less than ${\pm}5%$. The difference in 3D dose gradients between the two groups was estimated in a cube of $6{\times}6{\times}6\;mm^3$ centered at the verification point. Under the assumption that setup errors existed during the DQA measurements of the examination group, a three dimensional offset point inside the cube was sought out, where the individual field dose difference was minimized. The average dose gradients of the control group along the x, y, and z axes were 0.21, 0.20, and 0.15 $cGy{\cdot}mm^{-1}$, respectively, while those of the examination group were 0.64, 0.48, and 0.28 $cGy{\cdot}mm^{-1}$, respectively. All 16 plans of the examination group had their own 3D offset points in the cube. The individual field dose differences recalculated at the offset points were mostly diminished and thus the average values of total and individual field dose differences were reduced from 3.1% to 2.2% and 15.4% to 2.2%, respectively. The offset distribution turned out to be random in the 3D coordinate. This study provided the quantitative data that support the large individual field dose difference mainly stems from possible geometric errors (e.g., random setup errors) under the influence of steep dose gradients of IMRT field.
목차
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참고문헌 (23)
참고문헌 신청
Ezzell GA / 2003 / Guidance document on delivery, treatment planning, and clinical implementation of IMRT: report of the IMRT Subcommittee of the AAPM Radiation Therapy Committee / Med Phys 30(8):2089~2115
Basran PS / 2008 / An analysis of tolerance levels in IMRT quality assurance procedures / Med Phys 35(6):2300~2307
Alber M / 2008 / Guidelines for the verification of IMRT / ESTRO
Woo MK / 2005 / Impact of multileaf collimator leaf positioning accuracy on intensity modulation radiation therapy quality assurance ion chamber measurements / Med Phys 32(5):1440~1445
Dong L / 2003 / Patient‐specific point dose measurement for IMRT monitor unit verification / Int J Radiat Oncol Biol Phys 56(3):867~877
Basran PS / 2008 / An analysis of tolerance levels in IMRT quality assurance procedures / Med Phys 35(6):2300~2307
Alber M / 2008 / Guidelines for the verification of IMRT / ESTRO
Woo MK / 2005 / Impact of multileaf collimator leaf positioning accuracy on intensity modulation radiation therapy quality assurance ion chamber measurements / Med Phys 32(5):1440~1445
Dong L / 2003 / Patient‐specific point dose measurement for IMRT monitor unit verification / Int J Radiat Oncol Biol Phys 56(3):867~877
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