Interactive segmentation for CT and MRI in your browser: click inside a structure to include it and outside to exclude it, and Nalvera iSeg outlines it for you to refine with brushes.
Use Nalvera iSeg in your browser: it runs in the cloud. No coding, no installation.
Upload a CT or MRI scan as a .nii.gz file or a whole DICOM folder.
Click inside a structure to include it and outside to exclude it. The first run needs three clicks; after that, Nalvera iSeg updates the 3D outline after each click.
Refine the edge with the circle, smart or smart-3D brush and save your structures to Results as a .nii.gz mask.
Research segmentation and correction of user-defined structures, including organs and lesions. Not for primary diagnosis or treatment planning.
Output quality depends on click placement and image contrast. Ambiguous or low-contrast boundaries may need several clicks or manual brush correction.
Create and correct your own structures in the Studio.
Correct the result in your browser, then measure each structure and follow it across your study. See what is measured
In the Interactive Studio, open the scan from your study, outline the lesion with clicks and save. The patient's Quantification table then lists its volume and, under Columns, its maximum 3D diameter and axial long and short axes. Outlines over 1 million voxels and scans with SPECT and no PET get no diameters.
Use this platform citation when describing work carried out with Nalvera iSeg.
@misc{nalvera,
title = {Nalvera.AI: a cloud platform for medical-imaging AI},
author = {{van der Heyden, Brent}},
year = {2026},
howpublished = {\url{https://nalvera.ai}},
note = {Model: Nalvera iSeg (interactive). Accessed YYYY-MM-DD}
}