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Open Imaging Index
MRI Brain

CONNECT/ARCHI

ARCHI database of the European CONNECT project

Multimodal brain MRI of healthy young adults (diffusion, anatomical, relaxometry and resting-state fMRI), acquired to build probabilistic atlases of human white matter and cortical connectivity. Images are not released; derived connectivity data are on EBRAINS.

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Overview

ARCHI is a brain MRI database that CEA NeuroSpin in Gif-sur-Yvette, France, acquired for the European CONNECT project. Its aim was a probabilistic atlas of human brain connectivity, built from diffusion tractography and complemented by anatomical, relaxometry and resting-state functional scans of the same people. The MRI volumes themselves have not been released. What is public about the cohort are conference abstracts on atlases built from it and, since November 2019, derived connectivity releases on EBRAINS.

Composition

The database holds 79 healthy subjects aged 18 to 40. Each was scanned in two sessions of 90 minutes. The EBRAINS releases cover 78 subjects. They come as one input release (surface-projected resting-state fMRI time series and individual cortical meshes) and three connectivity releases built on it, one per cortical atlas: Desikan, Constellation (a connectivity-driven subdivision of Desikan computed from this group) and a surface projection of AAL without deep nuclei. Each connectivity release holds individual structural connectivity matrices from tractography, rsfMRI time series reduced to the atlas regions, the atlas as a GIfTI texture with region names and surface areas, individual meshes and an average mesh.

Acquisition

Scans were done on a 3 T Siemens Tim Trio with a 12-channel head coil. The protocol had 1 mm T1-weighted MPRAGE in each session plus one 0.75 mm T1-weighted scan, a B0 field map, HARDI diffusion along 60 directions at b = 1500 and 3000 s/mm², a multi-shell diffusion scheme of 20 directions on 10 shells up to 3000 s/mm², relaxometry series for T1, T2 and T2* mapping, and resting-state fMRI. Processing used BrainVISA (Morphologist, Connectomist).

Annotations

No manual labels. Derived products include automatically segmented white matter bundles (38 long and 94 short bundles in the atlas abstract), relaxometry maps and atlas-based cortical parcellations.

Known limitations

The MRI volumes are not shared, and no terms for them are published. The EBRAINS releases are controlled access: they require an EBRAINS account, an access request and the EBRAINS Data Use Agreement. Sex distribution and per-subject demographics are not reported in the abstracts. All subjects are healthy young adults from one site and one scanner.

Cohort

Aggregate numbers from the sources below. Bars are relative to the 79 subjects.

Age

range 18 to 40

No age bins reported.

Materials and methods in Schmitt et al. 2013, Proc. ISMRM 21, abstract 3155

Condition

Groups can overlap

  • Healthy control 79 100%

Materials and methods in Schmitt et al. 2013, Proc. ISMRM 21, abstract 3155

Scanner vendor

  • Siemens Healthineers 79 100%

Material and methods in Duclap et al. 2013, Proc. ISMRM 21, abstract 3153

Contrast / sequence

Groups can overlap

  • T1-weighted 79 100%
  • Diffusion-weighted 79 100%
  • T1 map 79 100%
  • T2 map 79 100%
  • BOLD fMRI 78 99%

Materials and methods in Schmitt et al. 2013, Proc. ISMRM 21, abstract 3155; Methods in Lebois et al. 2013, Proc. ISMRM 21, abstract 3154; Description in EBRAINS, Structural and functional connectivity data of the ARCHI database in the Desikan atlas (v1)

Field strength

  • 3 T 79 100%

Material and methods in Duclap et al. 2013, Proc. ISMRM 21, abstract 3153

License and access

Our reading of the license, not legal advice. Before you use the data, read the original license and confirm that your use is allowed. We take no responsibility for how you use a dataset. Full disclaimer

Access
Not shared

The data are not available outside the institution or study that holds them

Access page

No published license or data use terms

The data holder has published no license and no data use terms. Any use, sharing or commercial right has to be agreed with the data holder, and nothing can be assumed to be allowed. Default copyright and data protection law still apply.

No release of the MRI volumes and no terms for them were found. Derived data (surface-projected resting-state time series, cortical meshes and connectivity matrices in the Desikan, Constellation and AAL atlases) are on EBRAINS as controlled access: access is requested with an EBRAINS account and use is bound by the EBRAINS Data Use Agreement (version 1.0) and citation of the dataset DOI.

Original license text Checked 2026-10-08

What you can do

  • Commercial use Not stated
  • Not stated
  • Train ML models Not stated
  • Create derived data Not stated
  • Publish results Not stated

What you can share

  • Share the data Not stated
  • Share derived data Not stated
  • Share trained models Not stated

What you must do

  • Cite or credit Not stated
  • Share alike Not stated
  • Sign an agreement Not stated
  • Ethics approval Not stated
  • Manuscript review Not stated
  • Release code Not stated
  • Return results Not stated
  • Delete after use Not stated

Limits

  • No re-identification Not stated
  • Location limits Not stated

Citation

Schmitt B, Duclap D, Lebois A, Guevara P, Zhang H, Assaf Y, Poupon F, Rivière D, Cointepas Y, Le Bihan D, Mangin JF, Poupon C. A novel probabilistic connectivity atlas for the human connectome: the CONNECT/ARCHI atlas. Proc. ISMRM 21, 3155 (2013).

Sources

Every number on this page comes from one of these documents. Each chart names the table or page it is taken from. The raw numbers are in stats.csv.