| # Data dictionary |
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| ## pairs.tsv |
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| This pairing table contains one row per logical volume in the complete dataset, including controlled ADNI volumes that are not redistributed in the public archive. |
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| | Field | Meaning | |
| |---|---| |
| | `volume_id` | Unique volume identifier and filename stem | |
| | `source_dataset` | Stable machine-readable source code | |
| | `pair_id` | Paired acquisition or visit identifier within a source | |
| | `modality` | Structural contrast: `T1W`, `T2W` or `T2FLAIR` | |
| | `field_strength` | Acquisition field strength of this volume | |
| | `paired_field_strength` | Field strength of the matched volume | |
| | `relative_path` | Intended path in the complete dataset layout; ADNI paths are reconstruction targets and are not present in the public archive | |
| | `case_group` | Paired-case grouping key for partitioning; it is not guaranteed to link repeated visits from one participant | |
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| ## availability.tsv |
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| `availability.tsv` adds explicit access information keyed by `volume_id`. |
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| | Field | Meaning | |
| |---|---| |
| | `access_status` | `public` or `controlled` | |
| | `public_file_present` | Whether the image is included in the public archive | |
| | `source_record` | Persistent source record or controlled-access landing page | |
| | `access_note` | Practical access instruction | |
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| ## file_manifest.tsv |
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| Lists the 424 publicly downloadable NIfTI files, their byte sizes and SHA-256 identifiers. The SHA-256 values correspond to the Git LFS object identifiers in the frozen Hugging Face revision. |
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| ## dataset_summary.tsv |
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| Contains source-level counts for paired cases, same-contrast image pairs and logical volumes. |
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| ## ADNI selection lists |
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| The two CSV files in `adni/` each contain 47 rows corresponding to the 47 paired ADNI cases described in the manuscript. They identify the matched 1.5 T and 3 T images that authorised users can request from LONI. They do not contain MRI image files. |
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