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目的:探讨鼻咽癌面罩固定摆位时体位及照射野的重复性。方法:在模拟机下观察鼻咽癌面罩固定后鼻中隔与视野正中Y轴的重复性以及CT-SIM治疗计划模拟复位时照射野拍片与DRR图的重复性比较。结果:鼻咽癌病人面罩固定第Ⅰ段病人与第Ⅱ段新面罩病人体位及照射野重复性都在允许误差内,第Ⅱ段旧面罩病人则有较大误差。结论:鼻咽癌放射治疗中利用面罩固定可大大提高摆位的准确性和重复性,可作常规使用,但第Ⅰ段和第Ⅱ段病人都应各做新面罩。
Objective: To investigate the reproducibility of position and field of nasopharyngeal carcinoma mask when it is fixedly placed. Methods: The repeatability of the nasal septum and the median Y-axis of the nasopharyngeal carcinoma after mastectomy with nasopharyngeal carcinoma was observed under the simulator and the repeatability of the radiographs and the DRR of the irradiation field during CT-SIM treatment were simulated. Results: Patients with stage I nasopharyngeal mask masks and stage II new mask patients position and field repeatability are within the allowable error, the second paragraph of the old mask patients have greater errors. Conclusion: The use of masks in radiotherapy of nasopharyngeal carcinoma can greatly improve the accuracy and repeatability of positioning, which can be used routinely. However, patients in stage Ⅰ and Ⅱ should have new masks.