Iso Surfaces - Creating volumes with a threshold

[andrea_h]

Hello everyone,

I am working on an electrical field simulation with electrodes inside an irregular brain structure, and I’m trying to extract a volume containing only voxels with values above 200 V/m. I attempted using IsoSurface for this purpose, but I’m not getting the desired volume output, possibly due to the brain structure's irregularity and the complex E-field distribution.

Here’s the code I’m using:

simulation_extractor = simulation.Results()

em_sensor_extractor = simulation_extractor["Overall Field"]
em_sensor_extractor.FrequencySettings.ExtractedFrequency = u"All"
document.AllAlgorithms.Add(em_sensor_extractor)
inputs = [em_sensor_extractor.Outputs["EM E(x,y,z,f0)"]]
iso_surface_viewer = analysis.viewers.IsoSurfaceViewer(inputs=inputs)
iso_surface_viewer.DecibelScale = 0
iso_surface_viewer.IsoValues = (200,)
iso_surface_viewer.Data.Mode = iso_surface_viewer.Data.Mode.enum.QuantityAbsolute
iso_surface_viewer.Data.Component = iso_surface_viewer.Data.Component.enum.ComponentsAll
iso_surface_viewer.UpdateAttributes()
iso_surface_viewer.Update(0)
iso = iso_surface_viewer.raw
iso.CreateTriangleMeshFromIsoSurface()

With this setup, I don’t capture all the regions with values below 200 V/m, and I'm not sure if I'm missing a setting or approach. Has anyone faced a similar issue or can suggest adjustments to ensure a more accurate extraction of the desired volume?

Thank you!