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題名 | Fetal Heart Tracking in Ultrasound Image Sequences Using Coarse-to-Fine Wavelet=使用小波分析來追蹤超音波影像中胎兒的心臟 |
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作者 | 吳育德; 陳卉芸; 陳麗芬; 李柏磊; 葉子成; 謝仁俊; | 書刊名 | Journal of Medical and Biological Engineering |
卷期 | 22:2 2002.06[民91.06] |
頁次 | 頁67-74 |
分類號 | 415.81 |
關鍵詞 | 小波分析; 超音波影像; 物件追蹤; Coarse-to-fine wavelet; Ultrasonic images; Object tracking; Sum of squared difference; SSD; |
語文 | 英文(English) |
中文摘要 | 我們使用一組由低解析度到高解析度等級(coarse-to-fine)的小波基底函數為位移模型來追蹤超音波影像序列中胎兒的左心室形狀。在所提出的方法中,先利用較低解析度等級的基底函數(coarser-scale basis)為較大視窗以估算出較廣域之影像移動的訊息,再結合較高解析度等級的基底函數(finer-scale basis)為小視窗對所估算出的位移向量做局部分的修正以得到準確的追蹤結果。我們運用此方法成功的追蹤出在超音波影像中胎兒左心室的形狀,並利用Principle Component Analysis (PCA)中的特徵值(eigenvalue)來量化隨時間而變化的形變。未來希望能藉由此方法,由影像中量化出更多的生理數據並加以分類,以期事先診斷出可能發生嬰兒發生猝死症SIDS (Sudden Infant Death Syndrome)的胎兒以防患未然。 |
英文摘要 | We applied a newly developed wavelet-based method [Wu et al. 2000] to track objects in ultrasonic image sequences. The dense motion vectors between two successive images were represented by a linear combination of coarse-to-fine basis functions developed recently by Cai and Wang [Cai and Wang, 1996]. The coarser-scale basis function has larger support while the finer-scale basis function has smaller support. By minimizing the SSD (Sum of Squared Differences) iteratively, coarse-to-fine basis functions were used to match large-to-small full-resolution regions concurrently in recovering the motion vectors and thus tracking the target. Experimental results of tracking fetal heart in the ultrasonic image sequences were demonstrated. We further applied the PCA (Principal Component Analysis) to extract the deformation of tracked heart contour. The significant deformation along with other physiological parameters of fetuses can be employed in the application of predicting SIDS (Sudden Infant Death Syndrome) in future studies. |
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