【摘要】：目的:探討放射治療中真空袋和熱塑面膜對皮膚劑量的影響及其特點。方法:通過實驗測量固體水不同深度處表面加和不加真空袋/熱塑面膜時的劑量,計算加真空袋或熱塑面膜時皮膚劑量的增加值和最大劑量點劑量的變化規(guī)律。結果:熱塑面膜在固體水表面處劑量增高了42.5%,表面下1mm處劑量增高了23.8%;1.5cm厚的真空袋在固體水表面處劑量增高了47.7%,表面下1mm處劑量增高了26.9%;5cm厚的真空袋在固體水表面處劑量增高了94.2%,表面下1mm處劑量增高了54.2%;隨固體水深度的增加劑量增高值逐步降低。最大劑量深度處的劑量變化三種情況下均不大,小于等于1%。結論:真空袋和熱塑面膜對最大劑量深度處的劑量影響可忽略不計,但它們對皮膚及表面組織劑量的影響很大,存在表面超劑量現(xiàn)象,必須引起臨床醫(yī)師和物理師的注意,以防嚴重放射并發(fā)癥的發(fā)生。為了確保腫瘤得到足量照射又使得皮膚劑量不至造成嚴重并發(fā)癥,真空袋的厚度以不超過3cm為宜。
[Abstract]:Objective: to investigate the effect and characteristics of vacuum bag and thermoplastic mask on skin dose in radiotherapy. Methods: the dose of vacuum bag / thermoplastic mask was measured at different depth of solid water, and the increasing value of skin dose and the change rule of maximum dose point dose were calculated when vacuum bag or thermoplastic mask was added. Results: the dosage of thermoplastic mask increased by 42.5% on the surface of solid water and 23.8% at the surface of 1mm. The dosage of 1.5cm thick vacuum bag increased by 47.7% on the surface of solid water and 26.9% on the surface of 1mm. The dosage of 5cm thick vacuum bag increased by 94.2% at the surface of solid water, and the dose at 1mm increased by 54.2% under the surface of solid water, and decreased gradually with the increase of solid water depth. The dose change at the maximum dose depth was not significant in all three cases, less than or equal to 1%. Conclusion: the dose effects of vacuum bag and thermoplastic mask on the maximum dose depth are negligible, but they have a great effect on the dose of skin and surface tissue. There is a phenomenon of surface overdose, which must be paid attention to by clinicians and physicists, and the effects of vacuum bag and thermoplastic mask on the maximum dose depth are negligible. To prevent severe radiation complications. In order to ensure that the tumor is irradiated enough and the skin dose is not enough to cause serious complications, the thickness of the vacuum bag should not exceed 3cm.
【作者單位】： 上海市華東醫(yī)院放療科;上海市第十人民醫(yī)院放療科;
【分類號】：R730.55

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