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題 名 | 散射輻射對鋁階X光影像的影響與分布探討=The Influence and Distribution of Scattered Radiation in Aluminum Step Wedge |
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作 者 | 俞勝正; 顏凡智; 江武揚; 劉宏智; 呂坤木; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 35:3 2011.09[民100.09] |
頁 次 | 頁167-174 |
分類號 | 416.12 |
關鍵詞 | 穿透輻射; 散射輻射; 影像對比; 凹凸值; 散射分布; Primary radiation; Scattered radiation; Image contrast; Concave and convex values; Scatter distribution; |
語 文 | 中文(Chinese) |
中文摘要 | 對放射診斷而言,散射X光除了會影響影像的對比,同時也會降低訊雜比,本研究以鋁階為照射體,使用MATLAB對鋁階X光影像進行數值分析,探討散射X光對鋁階X光影像的影響程度;並經由電腦計算散射X光對影像矩陣的影響機率分布圖,建立X光影像的校正矩陣。研究結果顯示影像校正矩陣除了可以改善同一階梯的影像對比,同時階梯與階梯之間的影像辨別也獲得加強,校正後鋁階階梯間的數值差異,更能符合衰變定律中指數函數的數學期望。 |
英文摘要 | In diagnostic radiology, scattered radiation can not only reduce image contrast but also reduce signal-to-noise ratio (SNR).In this work, the Al-step wedge is irradiated and its radiographic image is analyzed with MATLAB to study image degradation by scattered radiation. In order to construct the correction matrix for image calibration, the scatter distribution on image matrix is simulated by computer. The results show that such calibration can significantly improve the contrast of each step of Al-step wedge images and can enhance the recognition between steps of Al-step wedge. After calibration, the numerical difference between steps of Al-step wedge will better accord with mathematical mode of the exponential decay law. |
本系統中英文摘要資訊取自各篇刊載內容。