CAJ | 학술논문

目的：探讨多叶准直器射野和独立准直器射野剂量学数据对放射治疗计划系统建模的影响。方法在Varian Unique型直线加速器上对多叶准直器和独立准直器射野的百分深度剂量、射野离轴量以及总散射因子进行比较。结果两种射野的百分深度剂量差别不大，但射野离轴量以及射野总散射因子差别较大。多叶准直器形成的射野均比独立准直器形成的射野要大；随射野变小，两者总散射因子的差异越来越显著。结论在计划系统的建模过程中必须关注不同射野的剂量学数据差异，建议在调强计划系统建模过程中采用多叶准直器射野进行数据采集。
목적：탐토다협준직기사야화독립준직기사야제량학수거대방사치료계화계통건모적영향。방법재Varian Unique형직선가속기상대다협준직기화독립준직기사야적백분심도제량、사야리축량이급총산사인자진행비교。결과량충사야적백분심도제량차별불대，단사야리축량이급사야총산사인자차별교대。다협준직기형성적사야균비독립준직기형성적사야요대；수사야변소，량자총산사인자적차이월래월현저。결론재계화계통적건모과정중필수관주불동사야적제량학수거차이，건의재조강계화계통건모과정중채용다협준직기사야진행수거채집。
Objective To evaluate the inlfuence of dosimetry data of radiation ifelds formed by multileaf collimator and independent collimator on the commissioning of treatment planning system. Methods The percentage depth dose, the off-axis ratio and the total scattering factors of radiation ifelds formed by multileaf collimator and independent collimator were measured in Varian Unique linac respectively. Results There is no signiifcant difference in the percentage depth dose of two kinds of ifelds. There are signiifcant differences in the off-axis ratio and the total scattering factors of two kinds of ifelds. The sizes of radiation ifelds formed by multileaf collimator are larger than the sizes of radiation ifelds formed by independent collimator. The differences in the total scattering factors of two kinds of ifelds are more and more significant along with the decrease of field sizes. Conclusion We must pay close attention to the differences of dosimetry data of radiation ifelds formed by multileaf collimator and independent collimator in the commissioning process of treatment planning system, which indicates that we should collect dosimetry data by using ifelds formed by multileaf collimator in the commissioning process of intensity-modulated treatment planning system.