EIDORS: Electrical Impedance Tomography and Diffuse Optical Tomography Reconstruction Software

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Using Netgen to create extruded EIDORS Models

Here are some examples of the varity of models which can be generated using the function: ng_mk_extruded_model.

Extruded 3D shape with 9 rectuangular electrodes

xy= [ -0.89 -0.74 -0.21  0.31  0.79  0.96  0.67  0.05 -0.36 -0.97;
       0.14  0.51  0.35  0.50  0.27 -0.23 -0.86 -0.69 -0.85 -0.46]';
fmdl = ng_mk_extruded_model({2,xy,1},[9,0,1],[0.05,0.4]);

Extruded 3D shape with mesh refinement and 5 large circular electrodes

xy= [ -0.89 -0.74 -0.21  0.31  0.79  0.96  0.67  0.05 -0.36 -0.97;
       0.14  0.51  0.35  0.50  0.27 -0.23 -0.86 -0.69 -0.85 -0.46]';
fmdl = ng_mk_extruded_model({2,xy,1,0.1},[5,0,1,2],[0.10]);

Extruded 3D shape mesh with boundary interpolation

xy= [ -0.89 -0.74 -0.21  0.31  0.79  0.96  0.67  0.05 -0.36 -0.97;
       0.14  0.51  0.35  0.50  0.27 -0.23 -0.86 -0.69 -0.85 -0.46]';
fmdl = ng_mk_extruded_model({1,xy,[4,50]},[8,0,0.3,0.6],[0.08]);

2D shape mesh boundary interpolation

xy= [ -0.89 -0.74 -0.21  0.31  0.79  0.96  0.67  0.05 -0.36 -0.97;
       0.14  0.51  0.35  0.50  0.27 -0.23 -0.86 -0.69 -0.85 -0.46]';
fmdl = ng_mk_extruded_model({0,xy,[4,47]},[16,1],[0.1]);

2D shape with object and specific electrode positions

xy= [ -0.89 -0.74 -0.21  0.31  0.79  0.96  0.67  0.05 -0.36 -0.97;
       0.14  0.51  0.35  0.50  0.27 -0.23 -0.86 -0.69 -0.85 -0.46]';
extra={'ball','solid ball = cylinder(0.2,0.2,0;0.2,0.2,1;0.2) and orthobrick(-1,-1,0;1,1,0.05) -maxh=0.05;'};
elec_pos = [0, 0; 30,0;60,0;90,0];
fmdl = ng_mk_extruded_model({0,xy,[4,49]},elec_pos,[0.1],extra);
img = mk_image(fmdl,1);
img.elem_data( fmdl.mat_idx{2} ) = 1.1;

3D shape with two objects and no electrodes

xy= [ -0.89 -0.74 -0.21  0.31  0.79  0.96  0.67  0.05 -0.36 -0.97;
       0.14  0.51  0.35  0.50  0.27 -0.23 -0.86 -0.69 -0.85 -0.46]';
extra={'twoball','solid twoball = sphere(0.2,0.2,.7;0.2) or sphere(-0.2,-0.2,.4;0.3);'};
fmdl = ng_mk_extruded_model({1,xy,[4,20]},[0,0],[0.05],extra);
img = mk_image(fmdl,1);
img.elem_data( fmdl.mat_idx{2} ) = 1.1;

3D shape with custom electrodes

xy= [ -0.89 -0.74 -0.21  0.31  0.79  0.96  0.67  0.05 -0.36 -0.97;
       0.14  0.51  0.35  0.50  0.27 -0.23 -0.86 -0.69 -0.85 -0.46]';
elec_pos = [0, 0.1; 30,0.2; 60,0.3; 90,0.4;120,0.5];
extra={'cyl','solid cyl = cylinder(0.2,-0.2,0;0.2,-0.2,1;0.2) and orthobrick(-1,-1,0;1,1,1);'};
fmdl = ng_mk_extruded_model({1,xy,[4,47]},elec_pos,[0.05,0.2],extra);
img = mk_image(fmdl,1);
img.elem_data( fmdl.mat_idx{2} ) = 1.1;

Thorax with two layers of electrodes

load CT2.mat;
fmdl = ng_mk_extruded_model({2,trunk/100 ,[4,50]},[6,0,0.5,1.5],[0.1,0.2]);

Thorax with lung with 16 circular electrodes

load CT2.mat; lung = flipud(lung(1:3:end,:));
fmdl = ng_mk_extruded_model({1,{trunk/100, lung/100} ,[4,50]},[16,0.5],[0.1]);
img = mk_image(fmdl,1);
img.elem_data( fmdl.mat_idx{2} ) = 0.9;
fmdl= img;