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頁籤選單縮合
題 名 | 醫用超音波斑紋疊減與影像增強=Speckle Reduction and Image Strength in Medical Ultrasound |
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作 者 | 李勝旭; 江銀波; 徐玫玉; 張永建; 徐啟偉; | 書刊名 | 澄清醫護管理雜誌 |
卷 期 | 5:1 2009.01[民98.01] |
頁 次 | 頁18-22 |
分類號 | 416.13 |
關鍵詞 | 醫用超音波; 斑紋; 雷登轉換; Medical ultrasound; Speckle; Radon transform; |
語 文 | 中文(Chinese) |
中文摘要 | 醫用超音波在B模式影像中,由於不均 勻物質的四散射形成一種特有的雜訊稱為斑妓 (speckle) ,此斑妓雜訊會影響影像的判讀,因此 如何去除此雜訊則成為超音波影像學上一個值 得探討的問題。一般為去除雜訊和增強影像其 方法多是基於非同調處理和影像後處理技術。利 用合適的濾器技術處理來抑制斑紋技術是一種常 用的影像後處理方法,而本研究的目的將嘗試 使用影像投影重建的方法,利用雷登轉換(radon transform)來撰寫程式執行影像後處理的方法,並 且與其他方法做分析比較。從研究結果中發現, 不同的濾器處理可以達到不同程度的影像增強與 平滑效果,在影像清晰度上,用中值濾、波處理比 用低通濾波處理效果還要好。而在雜訊處理上, 中值濾波處理後的影像內,雜訊處理效果也較 佳,而在低通濾波處理後的影像中,其雜訊還是 存在,只是較模糊不明顯而已。而在經過同形濾 波後,整張影像較原來的影像更清楚且較暗的地 方也變得更明亮清晰。而選用雷登轉換與適當的 濾器配合亦可有效使醫用超音波影像達到斑紋遞 減與影像增強。 |
英文摘要 | In the B-mode image of medical ultrasound, noise caused by the backscatter of uneven substance is called “speckle."Speckle may influence the interpretation of images; remoνing speckle is a subject of interest among sonographers. Normally, interpretation of noise and strengthening of image are based on asynchronous processing and image aftertreatment; using proper filter technique to suppress speckle is a commonly used image aftertreatment technique. The purpose ofihis research was to employ the Radon transform to write an equation for image aftertreatment and then to compare this approach with other methods. We discovered that different filter processes reach different levels of image strength and smoothness. We also found that the median wave process produced better image clarity than did the low-pass wave process. Use of the Radon transform and proper filters can reduce speckle and strengthen sonographic lmages. |
本系統中英文摘要資訊取自各篇刊載內容。