摘要
目的研究Monaco计划系统采用1野多弧设置时,通量的具体拆分方式。方法(1)模拟计划:选用密度均匀的圆柱形Delta4模体,在模体的CT图像上分别勾画2、3、4个横向整齐排列的圆柱形结构,模拟3例分别采用1野多弧照射2、3、4个孤立靶区的肿瘤患者,观察每个射野形状与靶区的位置关系,分析其规律性。(2)患者投照:采用完全随机法选取吉林省肿瘤医院经过放射治疗的3例患者,包括全脑预防性照射、鼻咽癌、宫颈癌患者,对每例患者分别设计3个容积旋转调强治疗计划,均为一个360°的射野,分别采用1野2、3、4弧进行治疗。所有计划的机架角度均归0°后,在加速器上执行计划,并使用Matrixx剂量验证系统分别测量每个计划的总剂量和每个弧的剂量,比较每个计划的总剂量与其每个弧剂量间的位置关系。结果模拟计划和患者投照研究结果均显示,在射野方向观(BEV)上,通量沿着x轴进行分割,通量分割的份数与计划中弧的数量相等;且各弧是按照先后顺序,在BEV上由左至右进行照射。结论了解Monaco计划系统的通量拆分方式,可为其在临床中的实际应用提供指导。
Objective To study the specific splitting mode of fluence in Monaco planning system with single-beam multi-arc.Methods(1)Simulation plan:two,three,and four cylindrical structures were drawn along the x direction on the CT image of the cylindrical Delta4 phantom with uniform density to simulate three cases that need to irradiate two,three,and four isolated target volumes at the same time,respectively,to observe the relationship between the shape of the irradiation fields and the target volumes and analyze their regularity.(2)Patient irradiation:the following past cases in Jilin Cancer Hospital were completely random selected:one case of whole brain prophylactic irradiation,one case of nasopharyngeal carcinoma,and one case of cervical cancer.Three volumemodulated arc therapy plans were designed for each patient.A 360°beam was used in all plans,and the difference is that the numbers of arcs were two,three,and four,respectively.The gantry angles of all real case plans were set to 0°,the real patient plans were delivered on the accelerator,and the Matrixx dose verification system was used to measure the total dose of the plans and the partial dose per arc.Compare the positional relationship between the total dose for each plan and its dose per arc.Results The results of simulation plan and patient irradiation study showed that on the beam's eye view(BEV),the fluence was divided along the x-axis,and the number of fluence divisions was equal to the number of arcs in the plan.Each arc was illuminated from left to right in the BEV direction in sequence.Conclusion The fluence splitting mode in Monaco planning system was elucidated,providing guidance for its practical application in clinic.
作者
杨金磊
卜明伟
李舒畅
张为天
刘明喆
候凯然
刘博宇
Yang Jinlei;Bu Mingwei;Li Shuchang;Zhang Weitian;Liu Mingzhe;Hou Kairan;Liu Boyu(Department of Radiation Oncology,Jilin Cancer Hospital,Changchun 130012,China)
出处
《国际放射医学核医学杂志》
2022年第4期217-222,共6页
International Journal of Radiation Medicine and Nuclear Medicine
