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Student Number 945201085
Author Yu-Ting Tsai(蔡育廷)
Author's Email Address 945201085@cc.ncu.edu.tw
Statistics This thesis had been viewed 1994 times. Download 1634 times.
Department Electrical Engineering
Year 2006
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title The Contactless Imaging System for the Conductivity of Biological Tissues
Date of Defense 2007-06-21
Page Count 88
Keyword
  • biological imaging
  • conductivity
  • differential receiver coil alignment
  • magnetic induction
  • reconfigurable instrument
  • Abstract Since the first biological conductivity image was proposed, the conductivity imaging has been regarded as a functional imaging technique in the medical field. The conductivity imaging provides many advantages in biomedical applications, such as non-invasion, long-term monitoring, radiation-free, portable, and lower cost. In this thesis, a high performance non-contact imaging system for the conductivity of biological tissues was proposed. The non-contact method has many advantages, such as simple mechanism, high safety, and reliability. The proposed imaging system includes contactless conductivity sensor, imaging platform, function generator, lock-in amplifier, and data acquisition/control card. The sensitivity and one-dimension spatial resolution was applied to evaluate the performance of the proposed sensor. The imaging results show the proposed sensor has high sensitivity and spatial resolution, which provides the feasibility of distinguishing the conductivity distribution on interesting region of biological tissues. In the end, the reconfigurable instrument scheme was proposed to improve the imaging system. The scheme which reduces noise resulted from wirings between instruments could improve the imaging quality and simplify the experimental procedures. The experiment results of modified imaging system show the improvement of the system stability and convenience.
    Table of Content 中文摘要
    英文摘要                        
    誌謝
    目錄I
    圖目錄III
    表目錄VII
    第一章 緒論1
    1.1 前言1
    1.2 文獻回顧2
    1.3 論文組織4
    第二章 非接觸式生物組織電導率測量原理6
    2.1 電解質導電特性6
    2.2 生物組織導電特性7
    2.3 生物組織等效電路模型8
    2.4 生物組織電導率9
    2.5 影響生物組織電導率測量的因素10
    2.6 非接觸式電導率測量原理11
    第三章 非接觸式生物組織電導率成像系統16
    3.1 非接觸式電導率感測器16
    3.2 激勵訊號輸入與感測訊號接收20
    3.3 成像平台21
    3.3.1 待測物載具22
    3.3.2 感測器載具23
    3.3.3 傳動裝置24
    3.3.4 步進馬達25
    3.3.5 步進馬達驅動器26
    3.4 訊號產生器28
    3.5 鎖相放大器32
    3.6 訊號擷取/控制界面卡38
    第四章 實驗與討論41
    4.1 靈敏度實驗41
    4.2 一維空間解析度實驗43
    4.3 生物組織一維空間掃描實驗46
    4.4 線性內插演算法提升成像品質實驗49
    4.5 食鹽水假體二維空間成像實驗50
    4.6 生物組織二維空間成像實驗54
    第五章 成像系統改良59
    5.1 成像系統改良方法59
    5.1.1 訊號產生器61
    5.1.2 訊號擷取界面63
    5.1.3 移動平均濾波器64
    5.1.4 RS-232控制器65
    5.2 成像系統改良後之實驗與討論66
    第六章 結論與展望68
    6.1 結論68
    6.2 展望69
    附錄A Delta-Sigma DAC設計方法70
    A.1 Delta-Sigma調變器原理70
    A.2 高階Delta-Sigma調變器設計方法75
    A.3 使用MATLAB/Simulink設計三階Delta-Sigma調變器78
    A.4 FPGA實現與實驗結果80
    參考文獻83
    著作目錄87
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    Advisor
  • Hung-Yuan Chung(鍾鴻源)
  • Files
  • 945201085.pdf
  • approve immediately
    Date of Submission 2007-06-28

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