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研究生:黃郡基
研究生(外文):Huang James
論文名稱:以個人電腦為基礎之三維重建及影像處理系統
論文名稱(外文):A PC-Based 3D Reconstruction and Image Processing System
指導教授:蘇振隆蘇振隆引用關係
指導教授(外文):Jenn-Lung Su
學位類別:碩士
校院名稱:中原大學
系所名稱:醫學工程研究所
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
中文關鍵詞:三維影像重建影像處理透明度影像表示和描述個人電腦
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本研究的主要目的,在應用架構在個人電腦上之醫學影像處理系統對二維醫學影像進行處理與進一步的重建,期能對醫院中所產生的病例影像與基礎研究人員所做的生醫影像,提供基本的影像處理與分析。此外,由此所獲得之輸出影像亦可作為醫學教育上,特別在人體內部之解剖構造方面等相關影像之重建實例教材。 系統可處理的影像,其種類含括了常用的二維醫學影像如電腦斷層掃瞄影像、核磁共振影像等擷像設備所擷取之醫學影像及一般不同解析度之影像,並具備了對多種不同影像檔案格式的讀取與結果儲存。針對這些不同性質與來源的醫學影像,在Windows系統下以AVS/Express為軟體發展環境並進行二維的醫學影像處理與電腦斷層掃瞄與核磁共振序列影像的三維重建。本套系統規劃並進行了不同的基本影像處理模式:如影像增強中的影像相加與相減、影像的反轉、影像的放大與縮小、空間上的中值濾波器、頻率域快速傅立葉轉換的顯示,影像分割上的邊緣檢測如Sobel運算子、Roberts運算子、Prewitt運算子,臨界值的選取、影像表示和描述中的膨脹與腐蝕、經由不同組合過程所構成的斷開與閉合、有興趣區域的圈選及配合三維重建中的透明度的設定、影像矩行邊界的加入及不同切面的擷取等,以相關串接之使用者界面及整合的處理功能,來達到使用上的便利性。 本系統在測試與評估方面,由實際的電腦斷層掃瞄影像,以矢狀切面、冠狀切面及橫切面等三個不同切面方向進行三維重建。另外,亦對現有的序列核磁共振影像對人體全身依序進行5個分割部位的重建,在電腦斷層掃瞄影像部份,對260張橫切面、200張冠狀切面及360張矢狀切面進行重建,重建時間分別為6時30分、9時20分及7時50分。在核磁共振影像部份,對34張頭部、70張軀幹、74張下腹部至大腿、45張大腿至小腿及56張小腿至腳部的重建時間分別為11、36、37、12及15分鐘。另外,將對重建過程中有關三維影像之不同程度透視予呈現與說明以作為臨床診治上的輔助或解剖教育等不同目的之應用。 本研究目前以個人電腦為基礎,並以單機方式分別對單一醫學影像種類進行重建與處理,因此系統在未來之改進上,將朝向進一步改善執行時間與整合多種不同特性的醫學影像進行三維重建,並與相關的醫學影像資料庫進行共通連結為目標。
A PC-based image processing which can apply to manipulating two-dimensional medical images and offering further three-dimensional reconstruction. It was expected to providefundamental image process and analysis for both medical imagesgenerated from hospitals and biomedical images obtained out offellows engaged in the associated basic research. Moreover, theresulted images from our system could be used for practicalcases of medical education, especially for the human anatomicalstructure. The images which could be processed by the system includedtwo-dimensional images which were generated from differentmedical modalities such as Computer Tomogram﹑Nuclear MagneticResonance images. Those in various types of images file formatswere able to either read or written in the system. The wholesystem based on AVS/Express as environment of softwaredevelopment under Windows system could process images above.This system handled different images processing modes for two-dimensional images such as common functions in imageenhancement, edge detection in image segmentation, closingand opening in image representation and description, theselection of region of interest. Functions of three-dimensionalreconstruction in this system contained the setting of transparency, the addition of rectangular bound box as well asfetching different slices. In order to reach facility of use,the user interface was designed as combination of the relatedfunctions as well as connection to each other. For the need for test and assessment, the system performed actual medicalimages. The separate slices with 260, 200 and 360 pieces respectively at three directions of coronal, midsagittal andtransverse planes were implemented so that 6 hours 30 minutes,9 hour 20 minutes and 7 hours 50 minutes were taken. Besides,a series of Nuclear Magnetic Resonance images based on humanbody, which divided into five parts including head, trunk, thigh, legs and feet, were input to reconstruct. The corresponding number of slices were 34, 70, 74, 45 and 56. The executed time were 11, 36, 37, 12 and 15minites, respectively. In addition, the transparency of three-dimensional images as well as the illustration duringreconstruction procedure were described and shown. Those could be applied to distinct purposes as an assistance inclinical diagnosis and treatment or anatomy education. At present, this system was based on a personal computerand enabled single sort of medical images to be processed andreconstructed by single computer. In the future, we will tryto improve reconstructing time and integrate multiple medicalimages with various properties to carry out three-dimensionalreconstruction. Eventually, it is a goal as well that our system might be connected to medical image database.
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