中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2012年
5期
468-470
,共3页
邢晓汾%崔桐%郑旭亮%褚薛刚%郑亚琴
邢曉汾%崔桐%鄭旭亮%褚薛剛%鄭亞琴
형효분%최동%정욱량%저설강%정아금
治疗计划系统%楔形因子%扩充型动态楔形板模型
治療計劃繫統%楔形因子%擴充型動態楔形闆模型
치료계화계통%설형인자%확충형동태설형판모형
Treatment planning systems%Wedge factor%Enhanced dynamic wedge model
目的 用扩充型动态楔形板( EDW)模型比较Pinnacle3 9.0治疗计划系统(TPS)的ACA算法和Eclipse7.3 TPS的AAA、PBC算法的准确性.方法 对瓦里安21EX 6 MV X线不同射野的EDW楔形因子(WF)进行实际测量和绘制二维剂量分布曲线,与2种TPS3种算法的计算结果进行相对误差和最大偏差比较.γ通过率分析平面剂量强度分布.结果 对称野WF的ACA算法相对误差＜2.8％,AAA算法的＜1.0％,PBC算法的＜1.2％；非对称野WF的ACA算法相对误差高达19.4％,AAA算法的＜2.0％,PBC算法的＜3.0％.楔形方向所有射野ACA算法最大偏差为3.0％,AAA算法的为2.7％,PBC算法的为4.0％.对称野3种算法的通过率＞87％,在去除半影区后＞96％；非对称野的＞85％,在去除半影区后达95％.结论 AAA、PBC算法对于对称和非对称野准确度均能满足临床需要,而ACA算法在非对称野条件下WF误差偏大,在实际临床中应尽量避免使用.
目的 用擴充型動態楔形闆( EDW)模型比較Pinnacle3 9.0治療計劃繫統(TPS)的ACA算法和Eclipse7.3 TPS的AAA、PBC算法的準確性.方法 對瓦裏安21EX 6 MV X線不同射野的EDW楔形因子(WF)進行實際測量和繪製二維劑量分佈麯線,與2種TPS3種算法的計算結果進行相對誤差和最大偏差比較.γ通過率分析平麵劑量彊度分佈.結果 對稱野WF的ACA算法相對誤差＜2.8％,AAA算法的＜1.0％,PBC算法的＜1.2％；非對稱野WF的ACA算法相對誤差高達19.4％,AAA算法的＜2.0％,PBC算法的＜3.0％.楔形方嚮所有射野ACA算法最大偏差為3.0％,AAA算法的為2.7％,PBC算法的為4.0％.對稱野3種算法的通過率＞87％,在去除半影區後＞96％；非對稱野的＞85％,在去除半影區後達95％.結論 AAA、PBC算法對于對稱和非對稱野準確度均能滿足臨床需要,而ACA算法在非對稱野條件下WF誤差偏大,在實際臨床中應儘量避免使用.
목적 용확충형동태설형판( EDW)모형비교Pinnacle3 9.0치료계화계통(TPS)적ACA산법화Eclipse7.3 TPS적AAA、PBC산법적준학성.방법 대와리안21EX 6 MV X선불동사야적EDW설형인자(WF)진행실제측량화회제이유제량분포곡선,여2충TPS3충산법적계산결과진행상대오차화최대편차비교.γ통과솔분석평면제량강도분포.결과 대칭야WF적ACA산법상대오차＜2.8％,AAA산법적＜1.0％,PBC산법적＜1.2％；비대칭야WF적ACA산법상대오차고체19.4％,AAA산법적＜2.0％,PBC산법적＜3.0％.설형방향소유사야ACA산법최대편차위3.0％,AAA산법적위2.7％,PBC산법적위4.0％.대칭야3충산법적통과솔＞87％,재거제반영구후＞96％；비대칭야적＞85％,재거제반영구후체95％.결론 AAA、PBC산법대우대칭화비대칭야준학도균능만족림상수요,이ACA산법재비대칭야조건하WF오차편대,재실제림상중응진량피면사용.
Objective To compare the accuracy of enhanced dynamic wedge (EDW) models of adaptive convolution algorithm (ACA) in Pinnacle3 9.0 and anisotropic analytical algorithm (AAA),and pencil beam convolution (PBC) algorithms in Eclipse7.3 treatment planning systems (TPS).Methods To evaluate the accuracy of the three algorithm models,we compared actual measurement values with TPS calculation values of EDW wedge factors under for different fields in which Varian-21EX 6 MV X-ray was applied,and also compared the actual dose distribution profile with that of TPS.Results The deviations of EDW wedge factors of symmetry fields and asymmetric fields are within 2.8％ and 19.4％ for ACA in Pinnacle3 9.0.Meanwhile,the deviations are 1.0％ and 2.0％ for AAA,1.2％ and 3.0％ for PBC in Eclipse7.3.The deviations between measurement and calculation of all fields profile for ACA is within 3％ and within 2.7％ for AAA within 4.0％ for PBC in wedge direction.For the dose distributions,we evaluated the pass rates of three algorithms using gamma analysis.The gamma pass rates among all the three algorithms in symmetry and asymmetric fields are above 87％ and 85％ respectively.After the removal of the penumbra zone,the pass rates among all the three algorithms are above 96％ in symmetry fields,and above 95％ in asymmetric fields,respectively.Conclusions AAA and PBC algorithms in symmetric and asymmetric fields can meet the need of clinical applications.While,wedge factor of ACA should not be used in clinical due to its greater error in asymmetric fields.
