Image Reconstruction using Modified Iterative Landweber Method in Electrical Impedance Tomography

전기 임피던스 단층촬영법에서 수정된 반복 Landweber 방법을 이용한 영상 복원

  • Kim, Bong-Seok (Institute for Nuclear Science and Technology, Jeju National University) ;
  • Kim, Ji-Hoon (Dept. of Electronic Engineering, Kyungpook National University) ;
  • Kim, Sin (Dept. of Nuclear and Energy Engineering, Jeju National University) ;
  • Kim, Kyung-Youn (Dept. of Electronic Engineering, Jeju National University)
  • 김봉석 (제주대학교 원자력과학기술연구소) ;
  • 김지훈 (경북대학교 전자전기컴퓨터학부) ;
  • 김신 (제주대학교 에너지공학과) ;
  • 김경연 (제주대학교 전자공학과)
  • Received : 2012.02.14
  • Accepted : 2012.06.27
  • Published : 2012.07.25

Abstract

Electrical impedance tomography is a relatively new imaging modality in which the internal conductivity (or resistivity) distribution of a object is reconstructed based on the injected currents and measured voltages through the electrodes placed on the surface of the object. In this paper, it is assumed that the relationship between the resistivity distribution and the resistance of electrodes is linear. From this linear relation, the weighting matrix can be obtained and modified iterative Landweber method is applied to estimate the internal resistivity distribution. Additionally, to accelerate the convergence rate and improve the spatial resolution of the reconstructed image, optimal step lengths for the iterative Landweber method are computed from the objective function in the least-square sense. The numerical experiments have been performed to illustrate the superior reconstruction performance of the proposed scheme.

Acknowledgement

Supported by : 한국연구재단

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