Anatomical
Fiducials Validator
Train and validate the placement of 32 neuroanatomical landmarks across human and non-human primate brain templates. Built for reproducible science.
Launch ValidatorAnatomical Fiducials (AFIDs) is an open framework for evaluating correspondence in brain images and teaching neuroanatomy through precisely defined landmark placement. Researchers and trainees place 32 landmarks in 3D Slicer, export the markup file, and upload here to receive instant, detailed placement feedback.
The protocol spans human and non-human primate brain templates, making it a cross-species tool for image registration quality control and neuroanatomy training.
AFIDs placement walkthrough in 3D Slicer
Open 3D Slicer and follow the AFIDs protocol to place 32 anatomical landmarks on your brain image.
Save your markup file from 3D Slicer as
.fcsv or
.json.
Upload here. Get per-landmark distance, directional error, and a regional error profile — instantly.
Radar chart of mean placement error across 8 neuroanatomical regions — see where your accuracy breaks down at a glance.
Each landmark error decomposed into anatomical axes — "2.1mm posterior, 0.8mm superior" — immediately actionable.
Mean ± SD error, best and worst landmark, and how many placements fall within 1mm and 2mm of the template.
Validate against human and macaque templates. NMT, D99, INIA19, Yerkes19, MacaqueMNI all supported.
Log in with ORCID and contribute your placements to the growing community dataset.
New: place landmarks directly in-browser on the MNI152 template with a real-time AI tutor that gives anatomical feedback after every placement. Try it →
GPL-licensed, community driven, and built for reproducible neuroimaging research.
Guided Learning Mode
Not sure where to start? The interactive learning mode loads the MNI152NLin2009cAsym T1w template directly in your browser and walks you through all 32 landmarks one by one. After each placement, an AI tutor gives you immediate anatomical feedback — what structure you likely clicked, how to visually identify the correct target, and how close you were. No software to install.
Ready to validate your fiducial placements?
Open Validator