前言：研究網眼技術應用在電子放射治療上對皮膚免除效應之影響，以期藉此增加皮膚對輻射的耐受度，解決使用電子射束治療時缺少皮膚免除效應的問題。材對與方法：使用底片測量術的方法，觀察當15x15cm?晶]合金網眼板上的網眼孔徑大小（d=0.45，1.0，1.5cm）、網眼之間的間隔寬度（s=0.4，0.2 cm）不同時，以不同能量的電子射東（6、8、10、12、14 MeV）照射劑量50M.U.，對底片的相對表面平均光密度及深度等光密度曲線分布情形所引起的變化。結果：在不同電子能量下使用網眼技術皆能減少相對表面平均光密度，其減少的程度與網眼板上開口部分所佔百分比相關，且深度劑主的分布亦受這些因素影響。其中網眼間距S=0.2cm，網眼孔徑d=1.5cm的規格設計既能同時減少表面所受劑量，又能在皮下經過一段距離後形成平坦的劑量分布，使腫瘤接受均勻劑量，符合實際臨床的需求。結論：雖然會有劑量波動的現象發生，但網眼技術確實能減少電子放射治療下的表面劑量，如能找出適當的網眼規格設計，或可利用網眼技術解決電子放射治療缺乏皮膚免除效應的問題，在給予高劑量電子放射治療的同時不會造成對皮膚的傷害。

　　　　　Purpose: The aim of this experiment is to solve the problem of lack of skinsparing in electron beam therapy and to increase the tolerance of skin to radiationby using grid technique.Materials and methods: The method of the electron grid therapy is to place a cerrobendgrid on the end of an electron cone. Film dosimetry was used to measure the relativesurface optical density and depth profile of grided electron beam with energies of6 to 14 MeV. Different grid hole diameters (d = 0.45, 1.0, 1.5 cm) and grid spaces(s = 0.4, 0.2 cm) were investigated for each electron energy.Results: Our results indicate that electron grid therapy can decrease the relativesurface optical density at various electron energies. The degradations of therelative surface optical density depend on the percentage of open area of the gridportal. The cerrobend grid with 1.5 cm diameter holes and grid space 0.2 cm couldconform to the demands of clinical radiotherapy. With this design we could decreasethe surface dose and the range of nonhomogeneous dose be limited to a depth so thatthe target volume could receive a homogeneous dose.Discussion: Grid technique can lessen the surface dose in electron beam radiotherapyindeed. We would delivery of high radiation dose with electron beams withoutdamaging the skin by grid technique.