Electrical impedance tomography. A sensitivity region reconstruction algorithm using adjacent drive current injection strategy.
The 'sensitivity region' method of back projection is converted from polar drive to adjacent drive current injection strategy and individual sensitivity coefficients incorporated. For each projection sensitivity coefficients for each pixel were established and pixels were grouped together into the 'sensitivity regions'. These contain all pixels that have their largest sensitivity coefficients associated with a particular measurement pair. Back projection of measurement data was performed using these coefficients as the basis of the reconstruction and less sensitive measurement pairs were ignored. Formulae for the back projection are discussed and images from computer simulated data and raw data supplied by Sheffield as part of this concerted action are presented. Comparison with polar current injection strategy is discussed.
Gadd
R
R
Department of Biomedical Engineering and Medical Physics, School of Biological Sciences, University of Keele, UK.
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Rolfe
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D000465:Algorithms; D004553:Electric Conductivity; D006801:Humans; D007091:Image Processing, Computer-Assisted; D014054:Tomography / Q000379:methods*