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Hi Gregoire,

We are in the process of making the BioPSE electrodes much more general and easier to use. At the moment, there are two electrode models that are well supported in BioPSE:

1) dipole sources (as exemplified in the forward-fem.net example and the Tutorial)

2) point sources (located at mesh nodes)

Point sources are used to set the potential at a particular location in the mesh. As an example of this, I am including a SCIRun network that creates seven +1V sources and seven -1V sources spread randomly through the Utah Torso, and then solves an FEM simulation and visualizes the results. Here's the network:

Attachment: forward-fem-random-point-sources.net
Description: Binary data

Note that by pressing the Execute button on the SampleField modules, you can create new source configurations and solutions. I should also note that currently we only support potential sources located at the nodes of the mesh (if a source is placed elsewhere, it will be applied to the nearest node).

The other potential (Dirichlet) electrode source models that we will soon be providing support for will be arbitrarily located polygonal sources, curvilinear sources, and point sources. To support each of these, we will be adding mesh refinement methods that include the electrode's faces, edges, and points within the mesh, respectively.

The "patch electrode" model that we used to support is no longer working, and will be retired when these new source models are added. In the mean time, I would strongly recommend sticking to the dipole and node potential sources.

Cheers,
Dave


On Oct 14, 2005, at 8:55 AM, Grégoire Walckiers wrote:

Salut Everyone

Is anybody can give me explanations on the use of the electrodes in the BIOPSE package, because i didn't find explanations neither in the Module reference guide nor on the html documentation.
From the source files, I would say that the closer points are projected on the electrode plane and that a fixed potential is applied on these points (dirichlet),
but I don't understand the front/back/both side option.
I would also know if it is possible to build electrodes by myself.

Thanks for your help

Gregoire
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• [SCIRUN-USERS] How to use electrodes, Grégoire Walckiers, 10/14/2005
  • Re: [SCIRUN-USERS] How to use electrodes, David Weinstein, 10/18/2005

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