不同放疗方法在胸腹部的移动特点比较

目的 探讨放疗过程中胸部和腹部的移动特点。方法 选取2016年2—7月四川省肿瘤医院接受放疗的120例患者,胸、腹部各60例。在放疗过程中采用Sentinel系统实时监测并记录患者2种治疗部位体表轮廓的移动数据,分析其移动特点。配对t检验差异。结果 胸、腹部移动类型主要包括基本不动型、移动稳定型、跳跃型及逐渐增加型4种,分别占14.0%、64.0%、8.7%和13.3%。治疗部位偏移值:胸部IMRT (6.55±2.34) mm和VMAT (4.97±1.24) mm (P=0.002),腹部IMRT (3.97±1.80) mm和VMAT (2.69±1.42) mm (P=0.004)。胸、腹偏移值随治疗时间的延长而增加,同一时间段内胸部的偏移值高于腹部。结论 对于胸部和腹部接受放疗的患者,治疗部位的移动是普遍存在的。VMAT技术能有效降低胸腹部的偏移值,确保治疗剂量的准确性。

Study on patient movements features during radiotherapy

Objective To study the patient movements features during radiotherapy. Methods Randomly selected 120 patients treated in our hospital from February to July on 2016,including 60 thorax treatment and 60 abdomen treatment. The movement data of patient treatment location during radiotherapy treatment was real time monitored by using Sentinel system,movement features of patient's location during radiotherapy was analyzed. Paired t-test difference. Results During radiotherapy,patient's treatment location movement types and proportion were motionless type 14.0%,Moving stable type 64.0%,Jumping type 8.7%,increasing type 13.3%.Patients with thoracic and abdominal radiotherapy,the maximum deviation of IMRT and VMAT treatment were (6.55±2.34) mm and (4.97±1.24) mm (P=0.002),(3.97±1.80) mm and (2.69±1.42) mm (P=0.004).In single treatment,the deviation value of the patient's treatment location increased gradually with the treatment time increasing and the deviant of thoracic is greater than abdominal at the same time after the treatment beginning. Conclusions Patient's treatment location movement during radiotherapy is commonly exist,using the technology of VMAT treatment can effectively reduce the treatment site movement of the patient during the treatment and ensure the accuracy of dose.