EIDORS: Electrical Impedance Tomography and Diffuse Optical Tomography Reconstruction Software

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GREIT algorithms: Example images

Prepare data: phantom data

% Tank Data $Id: demo_algs01.m 3839 2013-04-16 14:53:12Z aadler $

% exclude measures at electrodes
[x,y]= meshgrid(1:16,1:16); idx= abs(x-y)>1 & abs(x-y)<15;

load iirc_data_2006; clear v
v(1).vh= - real(v_reference(idx,1));
v(1).vi= - real(v_rotate(idx,1));

Prepare data: simulated FEM

% Simulated objects imb= mk_common_model('c2c',16); img= mk_image( imb ); vv= fwd_solve( img ); v(2).vh= vv.meas; img.elem_data([25,37,49:50,65:66,81:83,101:103,121:124])= 1.1; img.elem_data([95,98:100,79,80,76,63,64,60,48,45,36,33,22])= 1.1; vv= fwd_solve( img ); v(2).vi= vv.meas; % Noise sig = norm(v(2).vi - v(2).vh); randn('seed',50);noise = randn(size(v(2).vh)); v(3).vi = v(2).vi + noise/norm(noise)*sig * 10^(-6/20); v(3).vh = v(2).vh; subplot(221);show_fem(img); axis square; axis off print_convert demo_algs02a.png;

Prepare data: human tidal breathing

% Human breathing $Id: demo_algs03.m 1559 2008-07-27 03:19:58Z aadler $

% Electrodes on back
load montreal_data_1995
v(4).vh = double( zc_resp(idx,1) );
v(4).vi = double( zc_resp(idx,22) );

Algorithm results

% Algorithm list $Id: get_list_of_algs.m 1619 2008-09-22 16:32:56Z aadler $
function algs= get_list_of_algs;

algs = {'GREIT_Sheffield_backproj', ...
        'GREIT_NOSER_ndiff', ...
        'GREIT_NOSER_diff', ...
        'GREIT_test_ndiff', ...
       };

% Demo algorithms $Id: demo_algs04.m 1576 2008-07-28 09:19:55Z aadler $

algs= get_list_of_algs;

imb.calc_colours.ref_level = 0; % select colour output
imb.calc_colours.greylev   = 0.01; % black backgnd
imb.calc_colours.backgnd   = [.5,.5,.5]; %grey

for i= 1:length(algs)
   for k= 1:4
      [img,map] = feval(algs{i}, v(k).vh, v(k).vi );

      imc= calc_colours(img, imb);
      imc(~map) = 1; % background

      imwrite(imc,colormap, sprintf('demo_algs04_%d%d.png',i,k),'png')
    end
end

	Insulating target in tank	Simulated target (No noise)	Simulated target (6dB SNR)	Shallow breathing
Sheffield Backproj
NOSER Norm Diff
NOSER Diff
GREIT Test