Electrical impedance Analysis for Intra-operative Monitoring and Tissue Identification

• Main Authors: Chun-Hsi Wu, 吳宗羲
• Other Authors: 趙福杉
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/89599750324134877956

碩士 === 國立臺灣大學 === 醫學工程學研究所 === 99 === Since bioimpedance measurement is low cost, simple, and easy-to-use, it has been used to analyze biological tissues. This thesis is focused on measurement platform to satisfy the requirements for different biological materials. A pilot model for in vitro transurethral resection of the prostate procedure was built to monitor the changes of urethra diameter and blood leakage. The correlation between the diameters of the cylinders and the measured impedance is high. Also blood leakage, as simulated by the injection of saline can be detected by the platform. The relation between diameter and impedance is compatible with previous report [1]. In addition, we use the system to identify the characteristics of verruca and clavus in multi-frequencies. As nails are in the range of thick stratum corneum as clavus. In the beginning, we measured nail as a feasibility test. The consistency of measured impedance between each individual nail is relatively high, but the variation of different subjects is much larger than within an individual. Nevertheless, we can find the potential of identifying verruca and clavus in capacitive component of impedance. The proposed system is capable for tissue characterization and the pilot model for intra-operative monitoring is workable. The platform can be adapted with different kinds of electrodes for various tissues measurement.