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目的:设计一种新型体模,既能根据实际条件测量鼻咽癌放疗剂量,又能同时测量图像几何畸变度。方法:采用对放疗剂量极其敏感的热释光材料,构建头颈部U型槽作为载体,模拟病人实际头颈部肿瘤的大小轮廓、解剖结构和位置,将各个小组件组装拼接,构建新型头颈部放疗剂量测量体模,实现鼻咽癌放疗剂量测量;采用该新型测量模型,将同种形状模块按照一定规律排列和变化,测量图像三维几何畸变度。结果:与传统鼻咽癌放疗剂量的测量体模相比,新型体模能够根据病人实际条件进行精确调整,精确测量病人实际受照射剂量;与传统图像几何畸变度体模相比,新型体模能提供更多新型测量模型和排列方式来测量畸变度,显著提高测量精度。结论:新型体模将剂量测量体模和畸变度测量体模有机结合,既能准确测量鼻咽癌放疗剂量,又能精确测量几何畸变度,简单实用,在临床实际应用有很好的推广价值。
Objective: To design a new type of phantom, which can not only measure the radiation dose of nasopharyngeal carcinoma but also measure the geometric distortion of the image at the same time according to the actual conditions. Methods: Using the thermoluminescence material which is extremely sensitive to the dose of radiotherapy, the head and neck U-shaped groove was constructed as the carrier to simulate the size, anatomy and position of the actual head and neck tumor. The various small components were assembled and assembled to construct a new type of head Neck radiotherapy dose measurement phantom to achieve nasopharyngeal carcinoma radiotherapy dose measurement; using the new measurement model, the same shape modules arranged and changed according to certain rules to measure the three-dimensional geometric distortion of the image. Results: Compared with the conventional radiosensitization phantom, the new phantom can be precisely adjusted according to the patient’s actual conditions and accurately measure the patient’s actual exposure dose. Compared with the traditional phantom phantoms, the new phantom Can provide more new measurement models and arrangement to measure the distortion, significantly improve the measurement accuracy. Conclusion: The new phantom combines dosimetry and distortion measurement phantom, which not only can accurately measure the radiation dose of nasopharyngeal carcinoma, but also accurately measure the geometric distortion, which is simple and practical and has a good popularization value in clinical practice .