Design 2-Dimensional Digital Filter In Reconstruction Of EIT

  • Kang, Dong-Hoon (Department of Electrical Engineering, KyungPook National University) ;
  • Kang, Byung-Chae (Department of Electrical Engineering, KyungPook National University) ;
  • Kim, Ji-Hoon (Department of Electrical Engineering, KyungPook National University) ;
  • Hwang, Sang-Pil (Department of Electrical Engineering, KyungPook National University) ;
  • Kim, Jin-Yeop (Department of Electrical Engineering, KyungPook National University) ;
  • Jang, Jae-Duck (Department of Electrical Engineering, KyungPook National University) ;
  • Lee, Seung-Ha (Department of Electrical Engineering, KyungPook National University) ;
  • Choi, Bong-Yeol (Department of Electrical Engineering, KyungPook National University)
  • Published : 2004.08.25

Abstract

Electrical impedance tomography (EIT) has been suffered from the severe ill-posedness which is caused by the inherent low sensitivity of boundary measurements to any changes of internal resistivity values. So, small noise occur unexpected reconstruction image. Generally in EIT system, if measured voltage includes noise, we can't find object location and resistivity values. In this paper, we propose digital filter for measured voltage in EIT. Newton-Raphson is the most..popular algorithm in EIT, but noise cause to blur image. We use Fourier transform (FT) in order to minimize the noise and design the filter. After filtering, result of reconstruction image is improved better than before filtering.

Keywords