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Open Imaging Index
MRI Brain

IXI

Information eXtraction from Images

Nearly 600 brain MRI scans of healthy adults from three London hospitals, with T1w, T2w, PD, MR angiography and diffusion images and basic demographics.

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Overview

IXI is one of the oldest openly licensed brain MRI collections and is still widely used for brain age prediction, image synthesis between contrasts and as a healthy reference population.

Composition

About 600 healthy adults were scanned once. Each session aimed to acquire T1-weighted, T2-weighted and proton-density images, a time-of-flight MR angiogram and a diffusion scan with 15 directions. Not every subject has every image.

Acquisition

Three London hospitals contributed:

Site Scanner
Hammersmith Hospital (HH) Philips 3T
Guy's Hospital (Guys) Philips 1.5T
Institute of Psychiatry (IOP) GE 1.5T

The site is part of every file name, e.g. IXI002-Guys-0828-T1.nii.gz.

Demographics

The spreadsheet lists 593 unique subject ids. 565 of them have an age, and the age and sex counts on this page cover those 565 people. The spreadsheet also records height, weight and self-reported ethnicity.

Known limitations

  • The website does not say whether faces were removed from the images.
  • Acquisition parameters for the IOP scanner are not documented.
  • Some ids appear several times in the spreadsheet with different rows.

Cohort

Aggregate numbers from the sources below. Bars are relative to the 600 subjects.

Sex

  • Female 312 55%
  • Male 253 45%

Covers 565 of 600 subjects.

Age

mean 48.6± 16.5 · range 19.98 to 86.3
0
50
100
119
10-1920-2930-3940-4950-5960-6970-7980+

Age by sex

Reported cross table. Missing cells were not published (fewer than 10 subjects or not reported).

Female Male
  • 34
    70-79
    15
  • 71
    60-69
    48
  • 61
    50-59
    38
  • 48
    40-49
    41
  • 39
    30-39
    60
  • 55
    20-29
    46

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
Open download

Download without an account

Access page

Creative Commons Attribution-ShareAlike 3.0 Unported

Older version of CC BY-SA. Use, share and adapt for any purpose with credit. Anything you share that is built on the data must use the same license.

Original license text Version read: 3.0 Checked 2026-10-07

What you can do

  • Yes
  • Yes
  • Yes
  • Yes

What you can share

  • Yes
  • Conditional
  • Conditional

What you must do

  • Yes
  • Yes
  • No
  • No
  • Manuscript review No
  • Release code No
  • Return results No
  • Delete after use No

Limits

  • No
  • Location limits No

Citation

IXI Dataset, Biomedical Image Analysis Group, Imperial College London. https://brain-development.org/ixi-dataset/

All numbers

Every number on this page, as stored in stats.csv, with its source.

MeasureBreakdownValueSource
Subjectstotal
"nearly 600" subjects
~600ixi-page
Subjectssex=female 312demographics
Subjectssex=male 253demographics
Subjectsage=10-19 1demographics
Subjectsage=20-29 101demographics
Subjectsage=30-39 99demographics
Subjectsage=40-49 89demographics
Subjectsage=50-59 99demographics
Subjectsage=60-69 119demographics
Subjectsage=70-79 49demographics
Subjectsage=80+ 8demographics
Subjectssex=female;age=20-29 55demographics
Subjectssex=male;age=20-29 46demographics
Subjectssex=female;age=30-39 39demographics
Subjectssex=male;age=30-39 60demographics
Subjectssex=female;age=40-49 48demographics
Subjectssex=male;age=40-49 41demographics
Subjectssex=female;age=50-59 61demographics
Subjectssex=male;age=50-59 38demographics
Subjectssex=female;age=60-69 71demographics
Subjectssex=male;age=60-69 48demographics
Subjectssex=female;age=70-79 34demographics
Subjectssex=male;age=70-79 15demographics
Mean agetotal 48.6demographics
Age SDtotal 16.5demographics
Median agetotal 48.7demographics
Minimum agetotal 20demographics
Maximum agetotal 86.3demographics

Sources

The keys used in the table above.