電極訊號雜訊辨別及補償策略應用於可攜式電阻抗斷層掃描系統

Abstract

在現今已有許多成熟醫學影像的技術，如：X光、核磁共振(Magnetic Resonance Imaging, MRI)、超音波影像(Ultrasounnd)，但仍然沒有一項可以以低成本、動態即時的量測數據，協助醫生監測病人動態的身體狀況。電阻抗斷層掃瞄系統(Electrical Impedance Tomography, EIT)即是一種無輻射、低成本的醫學影像，其可以輔助醫生量測病人身體狀況，並達到低成本監測的效果，且比起目前醫療領域常見的醫學影像，更有潛力發展即時動態量測。本文使用電阻抗斷層掃描系統，其透過輸入電流量測電壓計算仿體阻抗，並分析組織分布，再經由演算法重建影像。本研究首先透過實驗觀察以壓克力材質的圓柱體當作待測物，並根據量測結果，驗證此實驗平台是否可以順利於導電液體中量測到物體及其位置變化，接著從量測到的電壓訊號切入，提出在人體實驗過程中動態量測待解決的問題及解決方案。

Nowadays, there are many mature technicians of medical image, such as X-ray, Magnetic Resonance Imaging(MRI), Ultrasound, but it is still hard to use the present medical image method for measuring data dynamically. Electrical Impedance Tomography(EIT) is a non-radiation, low-cost medical image, which can assist doctor to monitor physical conditions of patient. Compared to the present medical image, EIT has more potential to develop dynamic measurement. This study used electrical impedance tomography system which is designed by ITRI to analyze the distribution of impedance by measuring the voltage, and then reconstruct the image by algorithm. In this study, we used a cylindrical acrylic phantom filled with saline solution to demonstrate the EIT system validity. In addition, we proposed a new method to solve the problem about dynamic measurement in the process of human experiments.