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选取1991年7月～1992年6月单纯放疗的鼻咽癌病人120例,分析其放疗前CT图像,我们认为鼻咽癌累及咽旁间隙后区、口咽及前区完全填塞时有下行性生长倾向,最好采用面颈联合野;累及鼻腔者有向前上生长的倾向,鼻前野上半要包及后组筛窦;累及颅底者,要从入侵路径加量;累及前组颅神经者,多无颅底破坏,加量野可比正常颅底野低,以减少颅内受量,累及后组颅神经者,均有后区受累,设野要包及后区;为包及茎突内软组织。鼻前野面积最好采用7cm×7cm。
Select 120 cases of nasopharyngeal carcinoma patients who had undergone radiotherapy alone from July 1991 to June 1992. Analyze the pre-radiotherapy CT images. We believe that nasopharyngeal cancer has a descending effect on the parapharyngeal space, the oropharynx, and the anterior region when the patient is completely obstructed. Growth tendency, the best face and neck combined field; involving the nasal cavity has a tendency to grow forward, the nose before the wild half to pack and after the group ethmoid sinus; involving the skull base, to increase the amount from the invasion path; involving the front group skull Nerve, more than the destruction of the skull base, plus the amount of wild can be lower than the normal skull base, to reduce the intracranial dose, involving the latter group of cranial nerves, are involved in the posterior area, set up the wild pack and the back area; for the package and Styloid process soft tissue. The nose area is best to use 7cm × 7cm.