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EIDORS: Electrical Impedance Tomography and Diffuse Optical Tomography Reconstruction Software

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EIDORS: Programming / Objects

In order to clarify the operation of EIDORS, variables are packaged in to eidors objects. This page describes each EIDORS object and its members and methods.

Definition of Symbols

D
Problem dimension (D=2 for 2D, D=3 for 3D, etc)
Nf
Number of simplices (elems) in fwd problem (fine mesh)
Nc
Number of simplices (elems) in inv problem (coarse/reconst mesh)
Vf
Number of vertices (nodes) in fwd problem (fine mesh)
Vc
Number of vertices (nodes) in inv problem (coarse/reconst mesh)
Bf
Number of vertices (nodes) on boundary in fwd problem (finemesh)
E
Number of electrodes
S
Number of stimulation patterns
Mj
Number measurements made for stimulation pattern j
M
Number measurements per data frame (M = ΣMj)

EIDORS Objects Reference

data

A data object represents one set of measurement data. It is a collection of all measurements for each stimulation pattern. While not simultaneous, we conceptually represent this as representing the conductivity distribution at an instant. It is invisaged that data converter software be written to load from the various hardware systems into this format.

fwd_model

The EIDORS fwd_model represents the setup of the measurement configuration, including the medium geometry, electrode position and locations, and stimulation patterns
Notes
  • If the fwd_model does not correspond to a finite element model, then the elems parameter will not be present

inv_model

Notes
  • The fwd_model in the inv_model refers to the model on which the reconstruction is done. If any of the calculations take place on a fine mesh model, then these would be parameters to the particular inv_solve function.
  • If the inv_model solves onto nodes, rather than elements, then the fwd_model elems parameter will not be present

image

  • If the inv_model solves onto nodes, rather than elements, then the image will have a parameter node_data (rather than elem_data)

Last Modified: $Date: 2008-07-26 11:36:27 -0400 (Sat, 26 Jul 2008) $ by $Author: aadler $