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FieldBridge-MRI

MRI-PairedField is the dataset name used in the accompanying manuscript. The public Hugging Face and GitHub repositories retain the release name FieldBridge-MRI; both names refer to this same dataset and version. The collection brings together eight public sources of paired brain MRI in a common format for cross-field image translation.

Release: v1.0. The dataset contains full three-dimensional NIfTI images and a portable pairing table. Users should cite the manuscript and the original source publication or record for every source used.

The collection contains 161 case-level pairs, 259 same-modality image pairs and 518 full three-dimensional volumes. A case-level pair groups a participant's scans at two field strengths. A modality-pair contains two volumes of the same contrast, one at each field strength.

Source	Case-level pairs	Modality-pairs	Field strengths	Contrasts	Volumes
ULF	23	46	64 mT, 3 T	T1W, T2W	92
LUMC	11	33	64 mT, 3 T	T1W, T2W, T2-FLAIR	66
UNC	10	20	3 T, 7 T	T1W, T2W	40
Subcortical	10	10	3 T, 7 T	T1W	20
ADNI	47	47	1.5 T, 3 T	T1W	94
Penn	30	53	3 T, 7 T	T1W (30 pairs), T2W (23 pairs)	106
Hippocampal	20	40	3 T, 7 T	T1W, T2W	80
Vim	10	10	3 T, 7 T	T1W	20
Total	161	259			518

Image format

Images are full-volume float32 NIfTI files (.nii.gz) on the MRIxFields2026 reference grid: shape (364, 436, 364), spacing 0.5 mm isotropic. This is the resampled spacing, not the native acquisition resolution. The affine is:

[[0.5, 0,   0,   -91.5],
 [0,   0.5, 0,  -126.0],
 [0,   0,   0.5, -72.0],
 [0,   0,   0,     1.0]]

Source-specific alignment is followed by masked N4 bias correction and in-mask min-max normalization to [0, 1]. Background voxels are set to zero. N4 uses a shrink factor of 2, iterations [50, 50, 30, 20] and convergence threshold 1e-6.

Code and MRIxFields interface

Preprocessing and adapter code: PeirongLiL/FieldBridge-MRI.

Download

pip install huggingface_hub
hf download lipeirong/FieldBridge-MRI --type dataset --local-dir ./FieldBridge-MRI-data

To download one source only:

hf download lipeirong/FieldBridge-MRI --type dataset --include 'data/unc/**' --include '*.tsv' --local-dir ./FieldBridge-MRI-data

pairs.tsv has one row per volume. Its fields are fieldbridge_id (unique volume identifier), source_dataset (machine-readable source code), pair_id (same-subject pairing key), modality, field_strength, paired_field_strength, relative_path, and split_group (participant-level grouping key). Join two rows by source_dataset, pair_id and modality; the two rows must have reciprocal field-strength values. Paths are relative to this repository. Keep all rows with the same split_group together when partitioning participants. The mapping from machine codes to the eight display labels is given below.

The data occupies approximately 20.36 GB in compressed NIfTI form. The .nii.gz files are meant to be downloaded and read with NiBabel or SimpleITK; the Hub's tabular viewer does not display their three-dimensional contents.

The adapter supports bidirectional, same-modality records and axial slices z=72:292 (zero-based, end-exclusive). Optional 15-slice windows are a training interface; the dataset retains complete volumes. Physical 64 mT acquisitions are documented as 64 mT, with an adapter mapping for software that uses the label 0.1T.

Source datasets and use conditions

The release contains processed derivatives of the following sources. The source label in the first column is the human-readable name used in the manuscript; source_dataset in pairs.tsv is the stable machine code. Access, redistribution and citation remain subject to the original source terms. ADNI is controlled-access and must be obtained through the ADNI application and data-use agreement; this release does not redistribute ADNI raw files. For every other source, users should check the linked record for its current licence or access requirements and cite the linked paper or dataset record.

Manuscript label	`source_dataset`	Official source and released subset	Use condition
ULF	`openneuro_hfc`	Ultra-low-field brain MRI: test–retest reliability and correspondence to high-field MRI; OpenNeuro ds006557 v1.0.2. Same-day HFC 64 mT/3 T, T1W and T2W.	Follow OpenNeuro and source-publication terms; cite the study.
LUMC	`zenodo_20281403`	Paired 64mT and 3T Brain MRI Scans of Healthy Subjects for Neuroimaging Research; 11 matched cases, T1W/T2W/T2-FLAIR.	Follow the Zenodo record and source-publication terms; cite the record.
UNC	`unc`	A paired dataset of T1- and T2-weighted MRI at 3 Tesla and 7 Tesla; 10 paired cases, T1W/T2W.	Follow the linked dataset and publication terms; cite both.
Subcortical	`osf`	3 versus 7 Tesla MRI for parcellations of subcortical brain structures; 10 T1W pairs.	Follow OSF and publication terms; cite the study.
ADNI	`adni`	Alzheimer’s Disease Neuroimaging Initiative; 47 selected T1W 1.5 T/3 T pairs.	ADNI controlled access and data-use agreement apply; do not redistribute raw ADNI files.
Penn	`penn`	Penn 3T-7T Paired Epilepsy Imaging; 30 T1W and 23 T2W pairs.	Follow Pennsieve and source-publication terms; cite the record.
Hippocampal	`figshare_26075713`	A paired dataset of multi-modal MRI at 3 Tesla and 7 Tesla with manual hippocampal subfield segmentations; 20 T1W/T2W pairs.	Follow Figshare and publication terms; cite the study.
Vim	`lausanne_zenodo1438358`	Dataset comparison of MRI-based automated segmentation methods and functional neurosurgery targeting with direct visualization of the ventro-intermediate thalamic nucleus at 7 T; 10 T1W pairs.	Follow Zenodo and publication terms; cite the record and study.

The processed files in this repository are the released derivatives. They are not a replacement for obtaining permission to access the original raw sources.

The manuscript uses the name MRI-PairedField; the public release identifier is FieldBridge-MRI v1.0.

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MRI-PairedField (public repository: FieldBridge-MRI)

Contents

Image format

Code and MRIxFields interface

Download

Source datasets and use conditions