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題 名 | XV與EDR2底片之劑量表現與可能的影響參數=Dosimetric Performance and Possible Parameters of XV and EDR2 Films |
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作 者 | 林佑娟; 許文林; 陳逸偉; 廖明雄; 陳拓榮; | 書刊名 | 放射治療與腫瘤學 |
卷 期 | 12:2 民94.06 |
頁 次 | 頁137-142 |
分類號 | 416.36 |
關鍵詞 | XV底片; EDR2底片; 劑量; 光密度; XV film; EDR2 film; Dose; Photographic density; |
語 文 | 中文(Chinese) |
中文摘要 | 目的:研究放射治療常用之XV和EDR2二種劑量驗證底片的特性與線性劑量反應範圍。 材料和方法:由光密度劑量圖分析最適劑量區的範圍,並建議可應用之適劑量之反應區。另外評估劑量率、照野、深度、及X光能量,對XV和EDR2底片光密度的影響程度。 結果:由H&D曲線圖知XV比EDR2底片的斜率大,而且達到飽和點的劑量值較小,這說明此底片可測量的劑量範圍較窄。在不同的劑量率照射下,EDR2底片與XV底片的光密度劑量曲線並無明顯差異。照野言5×5 cm2變化至20×20 cm2,對二種底片光密度之影響變化均小於1.5%。20公分的深度變化,對二種底片光密度之影響小於2.3%。X光能量從4 MV增至10 MV,XV之光密度增加8.9%;而EDR2之光密度增加8.2%。 結論:在10 MV的X光曝露條件下,建議XV底片的最適劑量反應範圍在20-90 cGy;而EDR2底片之最適劑量反應範圍25~400 cGy。在光密度劑量圖之最適劑量區,EDR2底片的線性度較XV底片佳。在XV和EDR2底片的最適劑量區內,劑量率、照野、深度對光密度的影響小可忽略。但能量對光密度的測定,其影響不容忽視。 |
英文摘要 | Purpose: To study the characteristics of two radiographic films and their linearly response ranges. Methods and Materials: Measurement and using the sensitometric curves to analyze the dose performance and recommend the best responsive range for XV and EDR2 films. The parameters of dose rate, field size, depth, and energy of x-ray were applied to evaluate the change in photographic density. Results: Comparing the responsive region in sensitometric curves, the slope of XV film is larger than EDR2 film and the saturation dose of XV film is less than EDR2 film. It means responsive range of XV film is smaller than that of EDR2 film. The photographic density was not changed with the dose rate. As the field size changed from 5×5 to 20×20 cm2, the variation of four photographic densities was less than 1.5%. The change of photographic density was less than 2.3% within a depth form 5 cm to 20 cm. Replacing the energy of 4 MV with 10 MV, the density increased 8.9% for XV film and 8.2% for EDR2 film. Conclusion: We recommend the responsive range of XV film is from 20 to 90 cGy and EDR2 film is from 25 to 400 cGy, at the exposure of 10 MV x-ray. EDR2 film has a better linear relationship between photographic density and dose than XV film. No dose rate effect and a little change in field size and depth were found. But, the x-ray energy is an important parameter to the measurement of photographic density. |
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