C-arm影像三維重建

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姓名

鄭錦峰(Jin-Feng Cheng) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

C-arm影像三維重建
(Image reconstruction of C-arm System)

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摘要(中)

一般而言，三維影像可輔助醫師進行術前診斷，提高複雜手術的成功率。由此，本研究以常用於骨科手術之C-arm系統，整合一光學式定位裝置，進行C-arm影像的三維重建；其成本較使用CT影像低，且配合C-arm的高機動性，可避免病人排CT掃描所需等待之時間及健保給付的問題。
本研究分成三部份，依序為C-arm取像、影像前處理與影像重建等步驟。在C-arm取像方面，利用光學式定位裝置量測並計算C-arm旋轉的方位，配合影像擷取卡擷取各方向的C-arm影像。在影像前處理方面，利用雙線性內插方式將附加標記的灰階值以鄰近點灰階值取代。在影像重建方面，針對C-arm系統之錐狀投影特性，以適用於錐狀投影的FDK演算法方式，配合一般平行投影方式回推原物體的各個像素的灰階值，最後將重建完成的影像利用行進方塊法(Marching Cube)進行三維表面模型的繪製。
本研究共進行兩項實驗，其一為驗證重建原理用的壓克力方塊實驗，其二為應用豬骨關節當重建物的實驗。前者所得之模型尺寸，其邊長誤差介於0.47(1.2%)至1.35mm(3.4%)左右，與實際物體差異不大；後者的形狀較不規則，又加上取像張數並不足夠，其外型會有破碎的情況發生，但整體外型尚可分辨。

關鍵字(中)

★ 影像重建
★ 錐狀投影
★ 骨科手術
★ C-arm

關鍵字(英)

★ Image Reconstruction
★ C-arm
★ Cone-beam Projection

論文目次

摘要 I
目錄 II
圖索引 IV
表索引 VI
第一章緒論 1
1-1 研究動機 1
1-2 文獻回顧 1
1-3 研究方法 3
1-4 論文介紹 4
第二章 C-ARM 影像重建前處理 5
2-1 儀器介紹 5
2-1-1 光學式定位裝置 6
2-1-2 校正器 9
2-2 系統流程 10
2-2-1 取像方式 10
2-2-2 重建前處理 12
2-2-3 影像重建 12
2-3 附加標記影像之去除 12
2-3-1 偵測影像上附加標記位置及計算發射源位置 12
2-3-2 附加標記灰階值之內插 13
第三章 C-ARM 影像三維重建 16
3-1 影像重建基本原理 16
3-2 錐狀投影原理與其數學建構 21
3-2-1 C-arm影像投影模式 22
3-2-2 扇形投影原理 23
3-2-3 廣義錐狀重建原理 – FDK演算法 26
3-3 三維電腦模型顯示 29
第四章實驗結果與討論 33
4-1 實驗一部分 33
4-2 實驗二部份 47
第五章結論 56
參考文獻 59
附錄 63

參考文獻

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指導教授

曾清秀(Ching-Shiow Tseng)

審核日期

2004-9-29

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