Galbraith D M, Aget H, Leung P M, Rider W D
Int J Radiat Oncol Biol Phys. 1985 Mar;11(3):591-5. doi: 10.1016/0360-3016(85)90193-2.
Treatment of cancer of the antrum and nasopharynx often includes the radiation of tissues close to an uninvolved eye. One treatment method consists of using an anterior high energy X ray beam directed to the tumor through the eye. To maintain a high dose adjacent to and behind the eye while reducing the entrance dose to the eye, build-up material is placed on the skin and a tunnel cut through to the eye. When the build-up material is tissue-like, the tunnel can be several centimeters in height and scattered radiation from the tunnel walls will largely offset the build-up properties of the beam. Using higher density build-up material, the dose to the superficial layers of the eye can be reduced almost to the limit set by the open beam characteristics. This technique has been used successfully for 8 years.
胃窦癌和鼻咽癌的治疗通常包括对未受累眼睛附近组织进行放射治疗。一种治疗方法是使用高能X射线束从前部穿过眼睛直接照射肿瘤。为了在降低眼睛入射剂量的同时，在眼睛附近和后方维持高剂量，需在皮肤上放置等效建成材料，并开凿一条通向眼睛的通道。当等效建成材料类似组织时，通道可能有几厘米高，来自通道壁的散射辐射将在很大程度上抵消射线束的建成特性。使用更高密度的等效建成材料，可将眼睛表层的剂量几乎降低到由开放射束特性所设定的极限。这项技术已成功应用了8年。
