Objective To investigate the electronic line L-shaped field irradiation technique for convergence between conventional radiotherapy in nasopharyngeal radiation field problems . Methods in our hospital from April 2011 to October 2013 120 hospitalized patients with nasopharyngeal carcinoma were randomly divided into observation group and control group , 60 cases in each group ,the observation group planning system using three-dimensional simulation of 2D-nasopharyngeal conformal radiotherapy (CRT) ,or 3D-CRT treatment L -shaped electron beam irradiation techniques cloth wild wild, neck control group using conventional electron beam irradiation techniques cloth wild wild, al patients during radiotherapy dose required to record each region .Results There were 120 cases of nasopharyngeal carcinoma patients completed radiation therapy , in which the target dose observation group and the control group were more than 6000 cGy of enveloping volume has reached more than 95%,to meet the needs of the clinical dose of cancer treatment ,but control group (neck electron beam irradiation technology field) dose in patients with significant hot spots , the average doses up to 8700±360cGy, while the observation group (e-Line L-shaped field irradiation technique) average dose of 6500±290 cGy, compared the two groups ,the differences significant,P<0.05; observation group (L-shaped electron beam irradiation technology field ) surrounding the larynx doses greater than average volume of 6500 cGy is only 17.32±3.12%, while the control group (posterior electron beam irradiation technology field) was as high as 37.83±5.39%, compared with the two groups,the difference was significant,P<0.05. Conclusion observation group (E-Line L-shaped field irradiation technique) in the clinical dose cancer therapy requires no significant difference, P>0.05 with the control group (posterior electron beam irradiation technology field) compared with the observation group ,but (electronic line L shaped field irradiation technique) convergence between the radiation field and dose distribution has obvious advantages, and safe and effective , worthy of clinical application.
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