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題 名 | A Post-Processing Technique to Remove Extra-Cerebral Signals from Three-Dimensional Time-of-Flight MR Brain Images=應用後處理技術消除腦部磁振血管影像的腦外訊號 |
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作 者 | 高怡宣; 郭萬祐; 張智穎; 吳育德; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 29:1 民94.06 |
頁 次 | 頁1-8 |
分類號 | 414.93 |
關鍵詞 | 磁振造影; 磁振血管攝影; 最大訊號投影; 影像後處理; Magnetic resonance imaging; Magnetic resonance angiography; Time-of-flight; Maximum intensity projection; Image processing; |
語 文 | 英文(English) |
中文摘要 | 三維飛行時間 (three-dimensional time-of-flight) 磁振血管造影技術廣泛地應用在腦血管疾病的診斷。由於脂肪的T1值比較小,磁矩恢復的比較快,所以在原始影像上的訊號偏高。在最大訊號投影法所產生的影像上,脂肪的訊號會導致血管與背景的對比降低,甚至於遮蓋住血管的結構。籍由脂肪與腦部生理組織之間存在著無訊號的骨髂作分界,我們提出了一個自動化的影像後處理技術,應用自動閥值、侵蝕及擴張、區域增長等技術,將骨髂外面的訊號去除,只保留腦部區域的訊號,如此可在投影後的影像中,顯示較佳的血管結構。此一技術比較適用於大腦上端所取得的影像,因為此處骨髂所形成的邊界比較簡單。 |
英文摘要 | Three-dimensional time-of-flight MR angiography is routinely used for detecting cerebral vascular disorders in clinical practice. This technique is inherited with high signals of subcutaneous and bone-marrow fat tissues, and they can contaminate the visual perception of vascular structures on the maximum intensity projected views. Because cortical bones have low signals on three-dimensional time-of-flight MR images, the inner table of a skull bone can serve as a natural anatomical boundary between the brain surface and skull bone. This study presents an automatic post-processing technique based on automatic thresholding, morphological operation, and region growing techniques to extract the brain pixels using this boundary. The subsequent maximum intensity projections of brain pixels achieve a better display of cerebral vascular structures. This technique is mostly useful for imaging slices covering the upper cerebral hemisphere, where bone structure forms a good brain boundary. |
本系統中英文摘要資訊取自各篇刊載內容。