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研究生: 徐榮祥
Jung-Shian Hsu
論文名稱: 腫瘤偵測與顱顏骨骼重建
Tumor Detection and Craniofacial Implant Reconstruction
指導教授: 曾清秀
Ching-Shiow Teseng
口試委員:
學位類別: 博士
Doctor
系所名稱: 工學院 - 機械工程學系
Department of Mechanical Engineering
畢業學年度: 90
語文別: 中文
論文頁數: 96
中文關鍵詞: 腫瘤邊界偵測顱顏重建超音波影像
外文關鍵詞: Tumor, Craniofacial, Boundary detection, rapid protyping machine
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  • 本論文題出一個新的顱顏重建的方法解決重建的問題降低手術所須要的時間,以類神經網路預測病灶區的外形並於臨床應用獲得良好的結果
    另外本論文亦提出方有效的超音波偵測乳房腫瘤外型並用於腫瘤良惡性的判斷



    A method for tumor boundary detection and a procedure for the diagnosis of breast tumor are also presented. The grey level projection distribution of the ROI is adopted to determine the seed point and threshold value of the tumor. Then the tumor boundary can be determined by searching from the seed point and by using the region growth method. After the tumor boundary of each image slice has been determined, the tumor size and spatial position can be calculated accurately. The shape and margin of the detected tumor boundary can also be used to assist the prediction of breast tumor attributes. The method has been applied to detect the breast tumor boundary from sonograms and brain tumor boundary from CT image slices. The results of clinic tests show that the computer generated tumor boundary matches well with the subjective judgement of an experienced breast tumor expert and a neurosurgeon.
    In this study, fifty-four breast sonograms are analysed. In comparison with physician judgement, twenty-three cases reach 100% similarity. Fifteen cases reach 90% similarity and eleven cases reach 80%. However, one case only reaches 70% and four cases are different from the physician judgement.

    Contents AbstractⅠ ContentsⅢ List of figures and tablesⅤ Chapter Ⅰ: Introduction 1.1 Research Motivation1 1.2 Literature review2 1.3 Method6 1.4 Capsule summary8 Chapter Ⅱ: Boundary Detection of Bone Defects and Tumors 2.1 Defect boundary detection from CT images10 2.2 Tumor boundary detection from breast sonogram13 2.3 Boundary detection of brain tumor27 2.4 Implant boundary predicted by orthogonal neural network 30 Chapter Ⅲ: Reconstruction of Craniomaxillary Defects 3.1 Traditional defect reconstruction42 3.2 Surface prediction by orthogonal neural networks43 3.3 Malocclusion adjustment for mandible reconstruction51 Chapter Ⅳ: Boundary Detection of Ultrasound Images for the Diagnosis of Breast Tumor 4.1 Sonographic feature for Breast tumors58 4.2 Distinction between benign and malignant breast lesion61 4.3 Discussion69 Chapter Ⅴ: Boundary Detection and Reconstruction of Brain Tumor 5.1 Boundary detection of brain tumor from CT images------71 5.2 Reconstruction of brain tumor74 5.3 Discussion78 Chapter Ⅵ :Conclusion 80 References83 Appendix 88 List of figures and tables Figure 1-1 An ultrasound image with carcinomal tumor4 Figure 1-2 The tumor boundary detected by the Sobel method4 Figure 1-3 Boundary detection using the Snake-Balloon method6 Figure 1-4 The breast tumor with blood vessel around and fat inside6 Figure 2-1 Boundary detection of a skull CT image with a defect 12 Figure 2-2 Boundary detection of a skull CT image without defect 13 Figure 2-3 The flowchart of the breast tumor boundary detection 14 Figure 2-4 Selection of the ROI15 Figure 2-5 Grey level projection distribution in horizontal direction15 Figure 2-6 Grey level projection distribution in vertical direction16 Figure 2-7 Distance distribution of boundary points19 Figure 2-8 Procedure for tumor shape determination 21 Figure 2-9 Procedure for tumor margin determination22 Figure 2-10 The change of ROI vs. standard deviation26 Figure 2-11 The procedure of brain tumor boundary detection31 Figure 2-12 A head CT image with brain tumor32 Figure 2-13 The brain tumor boundary32 Figure 2-14 A typical structure of the orthogonal neural network33 Figure 2-15 Implant surface prediction by the orthogonal neural network36 Figure 2-16 Selection of the bone boundary around the defect37 Figure 2-17 The predicted boundary curve has a larger curvature37 Figure 2-18 The predicted boundary curve has a smaller curvature38 Figure 2-19The predicted curves based on the two selected bone boundaries38 Figure 2-20 Surface prediction procedure by 3D orthogonal neural network40 Figure 2-21 The construction of a 3D orthogonal neural network41 Figure 3-1 The defect crosses the central symmetric plane43 Figure 3-2 One of the head CT slices44 Figure 3-3 The predicted outer boundary curve of the defect44 Figure 3-4 The defect area marked by the region growth method45 Figure 3-5 The generated implant model45 Figure 3-6 The generated implant model fits the defect perfectly46 Figure 3-7 The real implant is fitted into the defect46 Figure 3-8 The bone coordinates around the defect derived by the Sobel method (in black) vs. by the neural network (in grey)47 Figure 3-9 A large defect on the left side of the skull49 Figure 3-10 The reconstructed implant is fitted into the defect49 Figure 3-11 The reconstructed implant model50 Figure 3-12(a) The reconstructed implant by 4x4 Lendegre polynomials52 Figure 3-12(b) The reconstructed implant by 3x3 Lendegre polynomials52 Figure 3-13 The patient suffered from malocclusion53 Figure 3-14 The mandibular segments are fixed by a fixation plate53 Figure 3-15 The 3D mandible prior to surgery53 Figure 3-16 The left residual mandible54 Figure 3-17 The right residual mandible55 Figure 3-18 The two residual mandibles (in red) are adjusted to their original positions55 Figure 3-19 A cutting plane cuts the right mandible segment from the normal mandible56 Figure 3-20 The fixation plate is bent along with the mandibular model57 Figure 4-1 Definition of quadrants63 Figure 4-2 The breast tumor shape marked by the surgeon66 Figure 4-3 The breast tumor shape generated by the proposed method66 Figure 4-4 The breast tumor shape marked by the surgeon66 Figure 4-5 The breast tumor shape generated by the computer67 Figure 4-6 The tumor is surrounded by fat 67 Figure 4-7 The tumor boundary generated by the proposed method68 Figure 4-8 Classification of diagnosis based on tumor shape and margin 70 Figure 5-1 The original CT image with brain tumor73 Figure 5-2 The CT image after Histogram-equalized enhancement 74 Figure 5-3 The blood block region 74 Figure 5-4 The hand-drawn tumor contour75 Figure 5-5 List of boundary detection results76 Figure 5-6 The 3D model of the skull and brain tumor 79 Table 2-1 Correlation ratio for different Ks and Kc28 Table 4-1 The list of tumor margins and shapes63 Table 4-2 Tumor shape/margin vs. biopsy result69 Appendix 188 Appendix 291

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