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題 名 | 胎兒大腦皮質複雜度之碎形分析=Fractal Analysis of Fetal Cortical Complexity |
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作 者 | 陳張宗榮; 徐國鎧; 吳育德; | 書刊名 | 清雲學報 |
卷 期 | 30:1 2010.01[民99.01] |
頁 次 | 頁39-53 |
分類號 | 414.93、414.93 |
關鍵詞 | 胎兒; 盒子計數法; 碎形維度; 腦皮質複雜度; 磁振造影; Box-counting method; Cortical complexity; Fetus; Fractal dimension; |
語 文 | 中文(Chinese) |
中文摘要 | 雖然成年人腦部複雜度的碎形分析已經被研究了許多年,使用碎形維度來分 析發育中胎兒大腦的複雜度卻未廣泛地被探索。本研究嘗試著利用碎形維度的概 念來量化胎兒大腦皮質複雜度。在台北榮總的胎兒磁振影像資料庫中,我們由96 個胎兒影像中,懷孕週數為27 到37 週,選出32 個正常的胎兒磁振影像,來作 為總體樣本。為了探究胎兒大腦皮質複雜度,我們使用MATLAB 程式,設計了一 個圖形使用者介面(GUI)。這個GUI 執行三項主要工作: (1) 圈選並分割出所需 二維切面磁振影像,(2) 重建三維胎兒腦皮質影像,及 (3) 採用三維盒子計數 法 ( 3D box-counting method )來估測碎形維度,以此量化發育中胎兒的腦皮 質複雜度。由三維盒子計數法的碎形維度結果明顯地指出,平均碎形維度明顯的 隨著懷孕週數增加而呈現高度正相關,顯示複雜度亦增加。而且,碎形維度平均 值由2.1414 ± 0.03 變化到2.3332 ± 0.02,這迅速增大的碎形維度值顯示, 發育中的胎兒大腦皮質變得更複雜。這結果與正常胎兒的腦部發育是一致的,更 推薦碎形維度對胎兒的腦皮質複雜度分析是一個適當且有效的分析利器。 |
英文摘要 | Although fractal analyses of adult human brain complexity have been performed for several years; the use of fractal dimension (FD) to analyze the development of fetal cortical complexity has not been extensively investigated. This study attempts to quantify the development of fetal cortical complexity using the concept of FD. Thirty-two fetal MR images were selected from Taipei Veterans General Hospital at 27-37 weeks of gestational age (GA). To investigate the FD of fetal cortical complexity, a graphic user interface (GUI) was implemented by custom-designed software written in MATLAB. Three main tasks were performed in this GUI: (1) segmentation was applied to fetal cortical surface for each slice of Magnetic Resonance images (MR images), (2) the three-dimensional fetal cortical surface was reconstructed, and (3) the 3D box-counting (BC) method was adopted to estimate the FD to quantify the fetal cortical complexity. The FD results from normal fetal brains show that the increase of cortical complexity is highly correlated with the gestational age of the fetus. Moreover, we found that the mean FD increased from 2.1414±0.03 to 2.3332±0.02, the resulting values of FD represent the faster development of convolved folds, which is consistent with fetal brain development. These results are in good agreement with normal fetal brain development and suggest that the FD is an effective means for the quantification of fetal cortical complexity. |
本系統中英文摘要資訊取自各篇刊載內容。