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胸部肿瘤以往多采用二野前后对穿照射及前后野加水平野照射,使其脊髓及胸骨受量偏高,纵膈剂量低,高剂量区常位于靶区之外,剂量分布不合理。放射治疗时,要求减少脊髓,正常肺及胸骨的受量(后者尤其对青少年),提高靶区的致死量。作者利用Philips-oss治疗计划系统,选择肺癌及纵膈肿瘤各一例。根据胸部的解剖位置,采用三野成角加楔形板,经治疗计划系统内存参数处理后,绘制出剂量分布曲线,其优点是靶区内剂量分布均匀。在肺癌及纵膈肿瘤达到致死量的同时,脊髓,正常肺组织及胸骨受量减少或为零。
In the past, thoracic neoplasms used multiple fields before, after and after exposure to field irradiation and horizontal field irradiation, so that the spinal cord and sternum receiving high, low dose of mediastinal, high dose area often located outside the target area, the dose distribution is unreasonable. In radiotherapy, it is required to reduce the spinal cord, normal lung and sternum receiving (the latter is especially for young people), and increase the lethal dose in the target area. The author used the Philips-oss treatment planning system to select one case of lung cancer and mediastinal tumor. According to the anatomical position of the chest, a three-angle angled wedge-shaped plate was used. After processing the memory parameters of the treatment planning system, a dose distribution curve was drawn. The advantage is that the dose distribution in the target area is uniform. While lung cancer and mediastinal tumors reached lethal doses, spinal cord, normal lung tissue, and sternum reception were reduced or zero.