CAJ | 학술논문

目的初步探讨容积调强弧形治疗(VMAT)在冠状面和矢状面的剂量验证意义.方法选取12例癌症患者的VMAT计划,在多插孔圆柱形体模内插入2个0.125 cm3的电离室探头进行点剂量测量.采用平面二维矩阵电离室及其组合体模,分别在冠状面和矢状面摆位方式下进行γ通过率的剂量验证.结果在高剂量区域(＞最大剂量的80％)和低剂量区域(≤最大剂量的80％)内,点剂量测量与计算结果平均误差分别为1.5％和1.7％.在冠状面和矢状面下二维电离室矩阵中心探头测量的点剂量与计算结果的平均差异为1.7％和1.8％.采用2％/2 mm、3％/3 mm标准的平均通过率分别为93.7％、97.2％.结论冠状面和矢状面VMAT剂量验证为临床VMAT计划提供了有意义的数据.
목적 초보탐토용적조강호형치료(VMAT)재관상면화시상면적제량험증의의.방법 선취12례암증환자적VMAT계화,재다삽공원주형체모내삽입2개0.125 cm3적전리실탐두진행점제량측량.채용평면이유구진전리실급기조합체모,분별재관상면화시상면파위방식하진행γ통과솔적제량험증.결과 재고제량구역(＞최대제량적80％)화저제량구역(≤최대제량적80％)내,점제량측량여계산결과평균오차분별위1.5％화1.7％.재관상면화시상면하이유전리실구진중심탐두측량적점제량여계산결과적평균차이위1.7％화1.8％.채용2％/2 mm、3％/3 mm표준적평균통과솔분별위93.7％、97.2％.결론 관상면화시상면VMAT제량험증위림상VMAT계화제공료유의의적수거.
Objective This study was to explore the feasibility of using the orthogonal plane dose formed by the coronal and sagittal plane to verify the volumetric modulated arc therapy (VMAT) plan.Methods The VMAT plans of 12 patients were included in this study.The orthogonal plane dose formed by the coronal and sagittal plane were measured based on the combination of 2D ionization chamber array and multicube phantom,and the point dose were measured based on a multiple hole cylindrical phantom attached with two 0.125 cm3 ionization chamber probes.Results In the measurement of the point dose,the average error was 1.5％ in high dose area ( more than 80％ of maximum),and 1.7％ in low dose area ( less than 80％ of maximum),respectively.The discrepancy of point dose measurement was 1.3％ between the 2D ionization chamber array and the VMAT planning system.In the measurement of the orthogonal plane dose,the pass rate of γ were 93.7％ for 2％/2 mm and 97.2％ for 3％/3 mm.Conclusion It is reliable for using the orthogonal plane dose formed by the coronal and sagittal plane to verify the VMAT plan.