查詢結果分析
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頁籤選單縮合
題 名 | Attenuation of X-Ray in Muscle and Alveolar Bone during Mandibular Premolar Periapical Radiographic Procedure=下顎小臼齒根尖X光攝影時肌肉及骨骼組織對於X射線衰減作用之研究 |
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作 者 | 邱品誠; 印憶恆; 林立民; 張寶樹; | 書刊名 | The Kaohsiung Journal of Medical Sciences |
卷 期 | 13:10 1997.10[民86.10] |
頁 次 | 頁631-634 |
分類號 | 416.932 |
關鍵詞 | 下顎; 小臼齒根尖; X光攝影; 肌肉; 骨骼組織; Dental radiographic image; Attenuation; Radiation dose; |
語 文 | 英文(English) |
中文摘要 | X光影像的產生是利用X光感應器如X光底片或儲存磷質,記錄X光受到被攝物體不同區域、不同程度之衰減以後到達感應器的輻射劑量。因此,我們可以知道X光影像是和X光在通過被攝體的衰減過程息息相關的。本實驗的目的是想要了解X光從射入皮膚到穿過下顎骨至到達底片的過程中大約衰減了多少比例的X射線,並比對兩種不同測量方法的差異。實驗中使用熱發光劑量計直接測量患者拍攝下顎小臼齒X光時皮膚的入射劑量以及底片上小臼齒牙根尖附近骨質部位的射出劑量算出兩者的比例。此外並使用放射物學公式推算相似條件下之入射劑量及射出劑量。實驗結果發現,以實際劑量測量法所算出之射出劑量-入 射劑量比值 (P值) 平均為0.07±0.018 (條件為60kVp,等效能量約為27keV);以放射物理學公式算出之P值在光子能量20keV時為0.00874,光子能量27keV時為0.06485,光子能量30keV時為0.15308。由實驗結果可得知實際測量值介於理論值20keV及30keV之間,並且與預測的結果相近。本實驗的結果可作為以底片或數位影像分析下顎骨骨質密度方面研究之參考。 |
英文摘要 | The main purpose of this study Is to find out the degree of attenuation when the x-ray entrances the skin and reaches the film at the bone area near the mandibular premolar root apex. In this study we used thermaluminescent dosimeters (TLDs) to measure the entrance dose and exit dose directly at the area of interest and calculated the penetration value P. We also simulated the attenuation process and calculated the P value In similar conditions. The results indicate that the mean P value of direct measurement from patient Is 0.071±0.018 (60kVp, HVL=1.5mm Al), while that for theoretical calculation is 0.06458 at 27keV. We concluded that P value of direct measurement can match with the theoretical value and further studies In jaw bone density and other related portions is worthwhile. |
本系統中英文摘要資訊取自各篇刊載內容。