Comparison of Dosimetry of Radiation Fields Formed by Multileaf Collimator and Independent Collimator
WANG Xiao-yong1, LIU Hui1, QIU Shu-shuai2, JIANG Zhou1
1.Department of Radiation and Chemotherapy, Zhongnan Hospital of Wuhan University, Wuhan Hubei 430071, China; 2.Department of Medical Oncology, Pu Ai Hospital of Wuhan City, Wuhan Hubei 430033, China
Abstract：Objective To evaluate the influence of dosimetry data of radiation fields 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 fields formed
by multileaf collimator and independent collimator were measured in Varian Unique linac respectively.
Results There is no significant difference in the percentage depth dose of two kinds of fields. There are
significant differences in the off-axis ratio and the total scattering factors of two kinds of fields. The sizes
of radiation fields formed by multileaf collimator are larger than the sizes of radiation fields formed by
independent collimator. The differences in the total scattering factors of two kinds of fields 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 fields 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 fields formed by multileaf collimator in the commissioning process of
intensity-modulated treatment planning system.
王骁踊，刘晖，仇树帅，江舟. 多叶准直器射野和独立准直器射野剂量学比较[J]. 中国医疗设备, 2013, 28(12): 124-126.
WANG Xiao-yong, LIU Hui, QIU Shu-shuai, JIANG Zhou. Comparison of Dosimetry of Radiation Fields Formed by Multileaf Collimator and Independent Collimator. China Medical Devices, 2013, 28(12): 124-126.
Klein DM,Tailor RC,Archambault L,et al.Measuring output factors of small fields formed by collimator jaws and multileaf collimator using plastic scintillation detectors[J].Med Phys,2010,37(10):5541-5549.
