mri_cor_fif_io.h File Reference

Writer for the COR.fif FIFF representation of an MRI volume (Neuromag/MNE convention used by all mne-c source-space tooling). More...

#include "mri_global.h"
#include "mri_vol_data.h"
#include <fiff/fiff_coord_trans.h>
#include <QString>
#include <QVector>

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Classes
class	MRILIB::MriCorFifIO
	Stateless serialiser that turns an MriVolData into a FIFF MRI set (COR.fif). More...

Namespaces
namespace	MRILIB
	Volume I/O, voxel geometry and slice resampling for structural MRI data inside mne-cpp.

Detailed Description

Writer for the COR.fif FIFF representation of an MRI volume (Neuromag/MNE convention used by all mne-c source-space tooling).

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

2.0.0

Date

February 2026

COR.fif is the canonical FIFF wrapper for MRI volume data used by every downstream mne-c step that needs MRI geometry — coregistration, BEM surface generation, forward-model assembly, and the mne_analyze inverse pipeline all consume the same tag structure. Producing it here lets mne-cpp loaders (MriMghIO, MriNiftiIO, MriCorIO) feed any legacy FIFF-driven workflow without requiring callers to detour through the MNE-Python mri.fif writer.

The writer takes an in-memory MriVolData, materialises one FIFFB_MRI_SLICE block per slice (carrying the slice's geometry and pixel buffer in the source's native encoding — byte / word / float, no quantisation), bundles them inside a single FIFFB_MRI_SET, and prefixes the head\u2192MRI identity plus any extra transforms the volume carries (e.g. Talairach).

Block structure:

FIFFB_MRI FIFF_BLOCK_ID FIFFB_MRI_SET FIFF_COORD_TRANS (HEAD -> MRI identity) [additional coord transforms: Talairach etc.] FIFFB_MRI_SLICE (repeated for each slice) FIFF_MRI_WIDTH FIFF_MRI_WIDTH_M FIFF_MRI_HEIGHT FIFF_MRI_HEIGHT_M FIFF_COORD_TRANS (slice -> MRI) FIFF_MRI_PIXEL_ENCODING FIFF_MRI_PIXEL_DATA /FIFFB_MRI_SLICE /FIFFB_MRI_SET /FIFFB_MRI

Ported from save_slices() / write_slice() in MNE C write_mri_set.c by Matti Hamalainen.

Definition in file mri_cor_fif_io.h.