臺灣博碩士論文加值系統

由於無片化醫院的推動，使得數位X光影像在整個醫療市場的佔有率逐年有升高之趨勢；近幾年來，國內未見相關之學術論文討論數位攝影條件的應用或建立調整方法，而此研究目的主要是建立一種，診斷用數位影像品質最佳化調整方法，以此方法所建立之攝影參數，影像品質可以保持在一定的水準，而受檢者所接受到的劑量也在合理的範圍內。
此研究所使用之影像接收器之矩陣大小為3000 × 3000，像素為 0.143 ×0.143毫米, 所產生可用區域為43 × 43 公分.理論上，每公分可以有3.5線對。用於影像品質量化的假體是使用自製假體，原理與商品化假體相同；並使用固態水假體堆成各種厚度目的是用以模擬人體的厚度。於臨床實驗上，總共收集79的病患，由4位放射科醫師做影像評估，統計方法採用無母數分析，信心水準為95%。
實驗結果為建立不同之身體厚度所需最佳穿透力，計算兩者間的關係式為y=2.4693x+15.338其相關性為0.99。臨床實驗，比較經由實驗與經驗值所建立出之曝光參數所形成的影像，於統計上形成有意義的差異。
此實驗之研究目的為提供一種診斷用數位影像品質最佳化調整方法，經由此種方法所建立之攝影參數表格，可以在不增加病患所接受的輻射劑量，而提升影像品質；放射科醫生也不用擔心有診斷訊息的遺失問題。

The filmless environment had advanced since ten years ago. The digital image system had occupied more radiography market, but we did not find any research about the digital image system application and exposure parameters adjustment in Taiwan. Therefore, the purpose of this study is to estimate procedure of optimisation of exposure parameters for diagnostic radiography.
In this study, the Matrix size of detector was 3 × 3k with a pixel size of 143 × 143 μm, leading to an active imaging area of 43 × 43 cm. The theoretical limit of spatial resolution was 3.5 lp/mm. The contrast-detail phantom was used to calculate image quality, and the solid water phantoms were used for stimulating scattered body. In the clinical trial, of a total 79 images of radiograph were obtained. Three radiologists and one resistant viewed the images, and ranked their preference of image presentation. Statistical significance of preference was determine by Nonparametric statistics（Mann-whitney U test）at the 95% confidence level.

中文摘要
英文摘要
目錄
圖目錄
表目錄
第一章 前言
1-1 研究背景
1-2 研究動機
1-3 研究目的
第二章 文獻回顧
第三章 前期實驗-假體製作
第四章 實驗原理
4-1 X光的特性
4-2 X光攝影技術
4-3 暴露技術因素
第五章 材料與方法
5-1 影像最佳化參數實驗
5-2 攝影參數校正實驗
5-3 臨床驗證
第六章 結果與討論
6-1 攝影參數校正實驗
6-2 攝影參數校正實驗
6-3 臨床驗證
第七章 結論
參考文獻
附錄一 受試者同意書
附錄二 人體試驗研究計畫許可書

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