动态适形弧放射治疗与容积旋转调强放射治疗在非小细胞肺癌立体定向放射治疗中的剂量学差异

目的 比较动态适形弧放射治疗(DCAT)与容积旋转调强放射治疗(VMAT)在非小细胞肺癌立体定向放射治疗(SBRT)中的剂量学差异.方法 选取2016年1月至2020年1月于济宁医学院附属医院接受放射治疗的15例非小细胞肺癌患者,用Monaco5.11.03治疗计划系统以相同的目标优化模板和治疗计划参数分别设计DCAT...

Dosimetric Comparison of Dynamic Conformal Arc Therapy Versus Volumetric Modulated Arc Therapy in Stereotactic Body Radiotherapy for Non-Small Cell Lung Cancer

Objective The dosimetric difference of dynamic conformal arc therapy(DCAT)versus volumetric modulated arc therapy(VMAT)in stereotactic body radiotherapy(SBRT)for non-small cell lung cancer was compared.Methods 15 patients who diagnosed with non-small cell lung cancer and received radiotherapy in Affiliated Hospital of Jining Medical University were selected.The DCAT plan and VMAT plan were designed for each patients respectively with the Monaco 5.11.03 treatment planning system under the same conditions,that is,the same objective constraint template and treatment planning parameters.When 95%of the target volume reached the prescribed dose for the two plans,the dosimetric distribution of plan target volume(PTV)and organs at risk,calculation time,monitor unit,control points and spill time were compared between them.Results Both DCAT plan and VMAT plan could meet the clinical requirements of PTV and organs at risk.The doses of some organs at risk of the VMAT plan were lower than those of the DCAT plan,meanwhile R_50% was superior to the DCAT plan;While the calculation time and spill time of the DCAT plan were both shorter than those of the VMAT plan,and the monitor unit and control points were both lower than those of the VMAT plan;The monitor unit of the DCAT plan was 1322.1 MU lower than that of the VMAT plan.Conclusions Non-small cell lung cancer patients treated with SBRT through DCAT and VMAT can both obtain the satisfactory dose distribution in the target area.VMAT plans showed better in protecting organs at risk.However,DCAT plans have advantages in terms of calculation time,monitor time,control points and spill time.