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术中电子线放射治疗(IORT)是指在手术区域内针对治疗靶区用4～20MeV的电子线给予10～20Gy的照射,其治疗范围可包括未能切除的肿瘤、小的残存灶和高危险复发区域,其优点是局部射野内剂量均一,周围正常组织受照少,治疗时间短。IORT成为局部治疗方式中的一种,可提高一定期别的某些肿瘤的局控率以及常规放疗和外科治疗的疗效,改善患者的生存质量。市场上能提供多种型号的1ORT限光筒,有硬式、软式和非接触式三种类型,几种限光筒临床应用的差异性还不太清楚。但限光筒的选择必须适应手术中不同暴露部位的需要,保证治疗靶区内组织固定良好,而正常组织在射野以外。放射物理部门的工作是非常重要的,其主要的剂量学要求有:电子束方向与限光筒方向一致,避免治疗区内的超剂
Intraoperative electron beam radiation therapy (IORT) refers to the treatment of the target area with 4 ~ 20MeV electron beam to give 10 ~ 20Gy irradiation, the scope of treatment can include unresected tumors, small residual lesions and high Dangerous recurrence areas have the advantages of uniform dose in the local field, less exposure to surrounding normal tissue, and short treatment time. IORT becomes one of the local treatment methods, which can increase the local control rate of certain tumors and the efficacy of conventional radiotherapy and surgery, and improve the quality of life of patients. The market can provide a variety of models of 1ORT light tube, there are hard, soft and non-contact three types, the difference in the clinical application of several light tube is not yet clear. However, the choice of the light-barrier tube must be adapted to the needs of different exposed sites in the operation to ensure that the tissue in the target area is well-fixed, while the normal tissue is outside the field. The work of the Department of Radiology is very important. Its main dosimetric requirements are: the direction of the electron beam coincides with the direction of the light trap, avoiding the over-treating in the treatment area.