⚡ Physics Simulator

Epicranial E-Field Simulator

This tool models how electrical current from a 7-electrode epicranial array distributes through scalp, skull, CSF and cortex — targeting a bottom of suclus focal cortical dysplasia (FCD).

The solver runs a quasi-static finite-difference simulation (∇·σ∇V = 0) on a 64×64×36 voxel grid at 1.5 mm resolution. Results update live as you adjust controls.

Skull barrier σ = 0.01 S/m CSF funnel σ = 1.65 S/m 6× focusing ratio SOR solver · 600 iterations

⚡ Epicranial E-Field Simulator

Epicranial stimulation targeting a bottom of sulcus focal cortical dysplasia.

Electrode Array Position

X offset (mm) 0 Y offset (mm) 0 Array rotation (°) 0

Electrode spacing (mm) 12

Stimulation

Current amplitude (mA) 1.0 Active electrode Center

Stimulation mode

Electrode Placement

● Epicranial: electrode on skull surface, beneath scalp. Current bypasses skull into CSF directly.

View

Coronal

Sagittal

Axial

Flow

Slice position 50% E-field threshold (% of peak) 10%

Colour scale clip (percentile) 99th

Lower = compress hotspot, reveal deep field detail.
Values above clip shown as peak colour.

Show layers

3D Morphology

Sulcus walls (CSF/GM surface) GM/WM boundary MRI-like slice plane E-field isosurface Bounding box

Sulcus surface = actual geometry used in solver. Rotate to see the V-shaped CSF fold. FCD sits at the fundus (red sphere).

Flow View Options Arrow density 8 Arrow scale 1.0× Flow plane

MRI-like background Sulcus wall surface Current density vectors (J) E-field overlay Colour arrows by direction

Arrow length ∝ |J| = σ·|E|. Colour = magnitude.
Sulcus CSF has 6× higher conductivity than GM — watch current converge into it regardless of array position.

Target Metrics

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Peak E (V/m)

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Target E (V/m)

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Selectivity

Selectivity = E at FCD ÷ mean E over surrounding cortex (10mm annulus). >1 means field is concentrated at target.

E-Field vs Depth

Vertical profile under array centre · click to toggle log/linear

Tissue Layers

Scalp (σ=0.43 S/m)

Skull (σ=0.01 S/m)

CSF (σ=1.65 S/m)

Gray matter (σ=0.276 S/m)

White matter (σ=0.126 S/m)

FCD target (location marker only)

🖱 Drag to rotate | Scroll to zoom | Right-drag to pan

Initializing solver…