inv_beamformer_compute.h File Reference

Shared math kernels (filter derivation, source power, regularised pseudo-inverse) used by both the LCMV and DICS beamformers. More...

#include "../inv_global.h"
#include "inv_beamformer_settings.h"
#include <Eigen/Core>

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Classes
class	INVLIB::InvBeamformerCompute
	Core beamformer math. More...

Namespaces
namespace	INVLIB
	Inverse source estimation (MNE, dSPM, sLORETA, dipole fitting).

Detailed Description

Shared math kernels (filter derivation, source power, regularised pseudo-inverse) used by both the LCMV and DICS beamformers.

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

Author

Christoph Dinh chris.nosp@m.toph.nosp@m..dinh.nosp@m.@mne.nosp@m.-cpp..nosp@m.org

Since

2.1.0

Date

March 2026

INVLIB::InvBeamformerCompute is a stateless helper that holds the numerical core of every beamformer in INVLIB. It implements the unit-gain filter \(W_{ug} = (G^{T} C_m^{-1} G)^{-1} G^{T} C_m^{-1}\), the Sekihara unit-noise-gain normalisation, the NAI variant, the per-source max-power orientation search, the regularised symmetric pseudo-inverse used to invert the data covariance / CSD, and the rank-reduction step for radially-deficient MEG sphere models. Pulling this code out keeps InvLCMV and InvDICS as thin orchestration layers and ensures both algorithms share the same numerically-robust kernel.

References:

• Van Veen et al., IEEE Trans. Biomed. Eng. 44(9), 867-880, 1997.
• Sekihara & Nagarajan, Springer, 2008.
• Gross & Ioannides, Phys. Med. Biol. 44, 2081-2097, 1999.

Definition in file inv_beamformer_compute.h.