近十年來，隨著電腦軟硬體與無感式內視掃描科技的革命翻新，電腦的圖形計算能力有了大幅度的增進，而以掃描影像為基礎之三維影像重建因此有了更廣泛的應用。
本研究期望自行開發一套醫療影像軟體，透過視窗程式的撰寫，將病患的電腦斷層掃描影像圖群建構為三維的三角網格模型，使醫師們能在軟體中自由觀視病患的三維實體模型與任意截面影像。其中，本研究結合了電腦斷層掃描(Computed Tomography; CT)與快速成型技術(Rapid Prototyping; RP)，藉由標準化實體模型資料－STL檔的輸出，製作出實體模型，使外科醫師能藉此規劃手術流程，預作金屬骨板或植入物，提高手術的精確性，縮短手術時間。
另一方面，本研究對於模型建構的過程做了誤差分析與精度量測實驗，根據實驗的結果分析，我們對於模型邊界扭曲的失真情形，提出了掃描間距要儘量逼近像素大小的建議。此外，我們對於掃描間距過大的病患影像群，提出了簡單的補償方法，利用內差出來的虛擬影像，減少掃描間距，使模型產生較連續的外表。

In the last decade, the big progress of computer techniques combine with medical CT (Computed Tomography) and MRI (Magnetic Resonance Imaging) equipment improves welfares of human life. The ability of computer graphics technology has been greatly enhanced. Therefore, the three-dimensional physical models created by laser sinter machine are widely used.
The aim of this research is to develop a computer-assisted medical image software. In order to assist medical doctors to preview sectional images from any angles, we reconstruct virtual 3D models on display that based on the images from patient’s tomography data. This fundamental research involves the techniques of medical radiation and nuclear system and mechanical laser sinter system. The STL (Stereo-Lithography) file format has been generated from our research. The produced models from RP (Rapid Prototyping) machine are used to assist surgeon on surgical planning, pre-operational simulation, and shaped implant. From the outcomes of our work, we can efficiently reduce the complex process in surgical operation and improve the probability of success in surgery.
Meanwhile, we also investigate the errors produced by reconstruction process. A refined method has been developed to reduce such errors. Regard to the outcomes of the experiment, we suggest that the scan distance of CT should close to the pixel size of CT image for the purpose of improving accuracy. Furthermore, we also develop a simple indemnifying method to amend the problems caused by large scan step. Virtual pixels are interpolated in order to produce smooth modeling.

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