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目的:探讨治疗床高读数在鼻咽癌调强放射治疗摆位过程中是否有参考价值,分析其是否有助于提高摆位的精确性。方法:随机选取20例在我院实施调强放射治疗的鼻咽癌患者。每次治疗时以“十”字标记线为标准摆位,并记录治疗床高的读数和零位源皮距的读数。每周分别以“十”字标记线为标准摆位(A组)和以治疗验证时零位源皮距为标准摆位(B组)用电子射野影像装置(EPID)拍摄正侧位验证片,共获得480张,所获得的图像与计划系统的数字重建射线影像(DRR)通过MOSAIQ系统进行骨性标志并计算摆位误差。结果:A和B组的图像误差在左右、头脚和前后方向分别为(1.58±0.70)、(2.26±1.20)和(1.19±0.75)mm以及(1.50±0.81)、(2.39±1.12)和(2.56±1.06)mm。A和B组在左右(t=0.56)、头脚(t=0.41)方向差异无统计学意义(P>0.05),但在前后方向的摆位误差差异有统计学意义,t=6.52,P<0.05。结论:在鼻咽癌调强治疗摆位时,治疗床高读数有重要的参考价值,有助于提高摆位的精确性。
OBJECTIVE: To investigate whether the high bed readings in the treatment of nasopharyngeal carcinoma with intensity-modulated radiation therapy have reference value, whether it helps to improve the accuracy of setting. Methods: Twenty patients with nasopharyngeal carcinoma undergoing IMRT in our hospital were randomly selected. Each treatment to “ten ” word mark line as the standard setting, and record the treatment of bed height readings and zero source skin distance readings. Weekly, respectively, “ten ” word line marked for the standard positioning (A group) and the treatment of zero-source source for the time being verified as the standard positioning (B group) with the electronic imaging equipment (EPID) A total of 480 validations were obtained. The acquired images and planning system’s digitally reconstructed radiographic images (DRRs) were skeletal-labeled using the MOSAIQ system and the setup error was calculated. Results: The image errors in group A and group B were (1.58 ± 0.70), (2.26 ± 1.20) and (1.19 ± 0.75) mm and (1.50 ± 0.81) and (2.39 ± 1.12) and (2.56 ± 1.06) mm. There was no significant difference between the left and right sides (t = 0.56) and the head and legs (t = 0.41) in the A and B groups (P> 0.05), but there was a significant difference in the setup error in the anteroposterior direction (t = 6.52, P <0.05. Conclusion: In the treatment of nasopharyngeal carcinoma, the height reading of the treatment bed has important reference value, which will help to improve the accuracy of positioning.