查詢結果分析
來源資料
相關文獻
- 應用田口方法評量NIPAN凝膠劑量計之電腦斷層攝影最佳調整參數
- 單管照射與四照野假體照射應用於凝膠劑量計之分析
- Neural Network Procedures for Taguchi's Dynamic Problems
- 放電加工多重品質設計
- 放電加工製程參數最適化之研究
- 品質工程之田口式實驗設計
- Manufacturing Process Optimization of Short Glass Fiber Reinforced Polycarbonate Composites in Injection Molding
- 以田口分析法探討實驗參數對碳六十產率之影響
- 以田口方法探討不同氯化鈉濃度切削液對JIS SUS 304不銹鋼鑽削時之刀具壽命研究
- 田口動態參數設計法於模糊控制上的應用
頁籤選單縮合
題名 | 應用田口方法評量NIPAN凝膠劑量計之電腦斷層攝影最佳調整參數=Optimization of the Imaging Protocol of an X-ray CT Scanner for Evaluation of NIPAN Polymer Gel Dosimeters Using Taguchi Methodology |
---|---|
作 者 | 邱琮祐; 謝栢滄; 趙璽雅; 曾玉華; | 書刊名 | 中華放射線技術學雜誌 |
卷期 | 37:1 2013.03[民102.03] |
頁次 | 頁47-55 |
分類號 | 416.14 |
關鍵詞 | 聚合凝膠劑量計; 田口方法; 劑量解析度; Polymer gel dosimeter; Taguchi methodology; Dose resolution; |
語文 | 中文(Chinese) |
中文摘要 | 近年來聚合凝膠劑量計(polymer gel dosimeter)被廣泛的研究,它是唯一能提供三維(three dimensions)劑量分佈的劑量量測工具,我們可利用電腦斷層掃描來評估凝膠劑量計中劑量分佈資訊。然而,電腦斷層掃描時參數的設定會影響到影像中雜訊,進而影響到劑量解析度(dose resolution),因此,本篇研究是應用田口方法(Taguchi methodology)中L8(eighteen groups)直交表(orthogonal arrays),對四項控制因子進行評量,以找出低毒性的NIPAM凝膠劑量計(NIPAM gel dosimeter)在電腦斷層成像時之最佳掃描參數,以降低影像雜訊之影響。結果顯示,原定直交表中的第一橫列(row),其S/N比為-2.07dB;而因無跳脫出原來直交表(orthogonal arrays)之設計,故去改變最重要因子(significant factor)以尋找極限值,而本研究中最重要因子管電壓(tube voltage)己達最大值,故改變次重要因子管電流(tube current),結果發現當管電流增加的同時,影像雜訊也隨之降低,當管電流增至260mA時影像雜訊下降即達到飽合值,此時S/N比為-0.79dB,優於原先設定。故本文中最佳調整參數為(A)視野大小(Field of view size):20cm。(B)管電壓(tube voltage)(kV):140kV。(C)管電流(tube current)(mA):260mA。(D)切面厚度(slice thickness):5mm。最佳掃描參數也會因不同機型的電腦斷層掃描儀而有所差異,因此對於不同電腦斷層掃描機,都需各別的評估其最佳化掃描參數,以降低影像雜訊對於劑量解析度上的干擾。 |
英文摘要 | In recent years, polymer gel dosimeter has been extensively studied and it is the only device that provides 3-dimensional dosimetry. CT scan can be used to evaluate the dose distribution information in the gel dosimeter. However, parameter settings of the CT scanner affect the image noise and hence the dose resolution. In this study, we used orthogonal array of L8 utilizing Taguchi methodology to assess the four controlling factors and identified the best scanning parameters of the low toxic NIPAM gel dosimeter in CT scan to reduce the influence of image noise. Our results showed that if S/N ratio of the first row of orthogonal arrays was -2.07dB, then the optimized adjustment parameters would fall outside the original design of orthogonal arrays. Therefore we adjusted the most significant factor to find the limiting value. Since the most important factor ”tube voltage” had reached the maximum values (so it could not be adjusted), we adjusted the secondary significant factor ”tube current”. It was found that when tube current was increasing, image noise was decreasing correspondingly. When tube current reached 260mA, the noise decreased to a minimum and reached saturation. At this point, the S/N ratio was -0.79 dB, which was better than previous default setting. Thus, in this study, the best adjustment parameters were: (a) Field of view: 20cm; (b) tube voltage: 140kV; (c) tube current: 260mA; (d) slice thickness: 5mm. Optimal scanning parameters vary according to different models of CT scanners. Individual assessment of the best scanning parameters of the gel dosimeter is required for different CT scanners to reduce the image noise and interference to dose resolution. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。