fwd_eeg_sphere_layer.h File Reference

Single concentric spherical shell (radius + conductivity) of a multi-layer EEG head model. More...

#include "fwd_global.h"
#include <Eigen/Core>
#include <QDebug>

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Classes
class	FWDLIB::FwdEegSphereLayer
	One concentric shell (outer radius rad, conductivity sigma and the derived ratios) of a multi-shell de Munck / Berg-Scherg EEG head model. More...

Namespaces
namespace	FWDLIB
	Forward modelling — BEM solver, spherical models, sensor/coil definitions and the lead-field assembly that links current dipoles to MEG/EEG sensor readings.

Detailed Description

Single concentric spherical shell (radius + conductivity) of a multi-layer EEG head model.

SPDX-License-Identifier: BSD-3-Clause Copyright (c) 2017-2026 MNE-CPP Authors

Author

Christoph Dinh chris.nosp@m.toph.nosp@m..dinh.nosp@m.@mne.nosp@m.-cpp..nosp@m.org; Lorenz Esch loren.nosp@m.z.es.nosp@m.ch@tu.nosp@m.-ilm.nosp@m.enau..nosp@m.de; Juan GPC jgarc.nosp@m.iapr.nosp@m.ieto@.nosp@m.mgh..nosp@m.harva.nosp@m.rd.e.nosp@m.du; Gabriel Motta gabri.nosp@m.elbe.nosp@m.nmott.nosp@m.a@gm.nosp@m.ail.c.nosp@m.om

Since

0.1.0

Date

March 2017

The classic four-shell de Munck / Berg-Scherg head model approximates the head as concentric spheres with piecewise-constant conductivity (brain, CSF, skull, scalp). Each layer contributes one boundary at which the electric potential must be continuous and the normal current density must scale by the conductivity ratio. FwdEegSphereLayer stores the two quantities the analytic solution needs from each shell — outer radius rad and conductivity σ sigma — along with the derived ratios reused inside the Legendre-series expansion.

Layers are sorted from inner to outer by rad before any series evaluation; this is the order assumed by fwd_eeg_multi_spherepot() in MNE-C and by every subsequent Berg-Scherg fit.

Definition in file fwd_eeg_sphere_layer.h.