Simulation and Measurement of Tissues’ Dielectric Characteristics

• Main Authors: Bao-Ren Lai, 賴寶仁
• Other Authors: Yin Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/63124632978437434230

碩士 === 國立陽明大學 === 醫學工程研究所 === 100 === Objective : In this thesis, we want to study the dielectric properties of the human tissues in order to build models to analyze and simulate the dissipation of the electromagnetic wave’s energy which transport from inside to outside of human body. To building this thesis, we want to achieve the purpose of positioning the position of invasive catheter with the system of transmission and received antenna. Methods : The experiment method separates two ways, one uses static magnetic field, another one uses EM wave. The materials of building static magnetic field are Fe2O3 powder and soft magnetic sheet. Before using the EM wave method, we need dielectric data of the different human tissues, and analyze the rest power after transferring tissues according to thesis. We have to measure dielectric properties of the tissues of ligamental flavum and interspinous ligament and supraspinous ligament which are access from porcine vertebral. We control experiment temperature in 37oc, and use network analyzer model N9923A to measure s parameter. At last, we can calculate the dielectric data from s parameter. Results : In the result, the gauss meter could not measure the magnetic field out of the distances of 5 centimeters. Conclusion : According to the result, it is not suitable to positioning the placement of invasive catheter with static magnetic field method. With EM experiment, we obtained the result of tissues’ penetration depth. And the tissues’ penetration depth are fitting the trend of the lower of the frequency, the deeper of the penetration depth.