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许多情况下鼻咽癌腔内照射的应用受到限制,其原因是①难于准确的固定施用器于病变区;②鼻咽部粘膜表面不规划,难于提供准确的照射剂量;③此法深度剂量低于表面剂量。间质插植照射能克朋这些缺陷,但鼻咽部难于置入,故很少应用。作者改良的间质插植照射技术通常在全麻下应用,患者仰卧头上抬,用可卡因溶液减轻鼻粘膜充血,软
In many cases, the application of intracavitary irradiation to nasopharyngeal carcinoma is limited because of the difficulty in accurately positioning the applicator in the affected area; 2 The mucosal surface of the nasopharynx is not planned, and it is difficult to provide accurate radiation doses; 3 The depth dose is low For surface dosage. The interstitial implant irradiation energy can cause these defects, but the nasopharynx is difficult to insert, so it is rarely used. The authors’ modified interstitial implant technique is usually applied under general anesthesia. The patient’s supine head is elevated and the cocaine solution is used to relieve nasal mucosal hyperemia.