RadiAnt DICOM Viewer

RadiAnt DICOM Viewer is a fast Windows program from Medixant for opening medical images: CT, CBCT, MR, X-ray, ultrasound and more. Dentists, radiologists and researchers use it to review studies from any vendor, including CBCT exports and panoramic X-rays, on an ordinary PC.

RadiAnt is shareware (conditionally free). The RadiAnt DICOM Viewer download installs a trial that includes every feature of the paid version. When the trial period ends, it has to be reactivated for further evaluation, and regular use requires a paid licence. The installer is only about 7 MB, and the program runs even on old hardware.

RadiAnt DICOM Viewer at a glance

What it does

• Opens DICOM from CR, DX, CT, MR, PET-CT, ultrasound, angiography, nuclear medicine and more, including RLE, JPEG and JPEG 2000 compressed images.
• 2D tools: zoom, pan, brightness and contrast, length, angle (including Cobb), ellipse and rectangle regions with mean, min and max values, length ratio and ellipsoid volume.
• 3D MPR (oblique multiplanar reconstruction) with MIP, MinIP and average modes.
• 3D volume rendering, with export of 3D models to STL files.
• PACS search, retrieve and send, plus a local archive database for studies you open often.
• Export to JPEG, BMP and video, copying to the clipboard for slides, and printing (also to PDF via a PDF printer).
• DICOM anonymization, available as an add-on package.
• Interface in more than 20 languages; a separate CD/DVD edition for discs that open on the recipient’s PC.

How dental teams use it

Reviewing a CBCT export from another clinic

1. Copy the DICOM folder or disc to a local drive.
2. Open the folder or DICOMDIR in RadiAnt; the series appear in the thumbnail bar.
3. Scroll the axial slices, then open 3D MPR to see coronal and sagittal planes.
4. Rotate the oblique planes to line up with a tooth or implant site, then measure.

Creating an STL model from a CBCT

1. Open the volume in 3D VR.
2. Adjust the threshold until bone and teeth are separated from soft tissue.
3. Export the 3D model to STL and clean it in MeshLab or Blender before printing.
4. CBCT grey values are not calibrated like medical CT Hounsfield units, so set the threshold visually and check the mesh.

Preparing images for a case presentation

Set the view, press Ctrl+C and paste into Word or PowerPoint, or export JPEG images or a short rotation video of the 3D rendering. Hide patient data before you share anything.

Install and first run

• Windows: run the universal installer; it picks the 32-bit or 64-bit build automatically. Accept the User Account Control prompt. On Windows 10, allow installation of apps from outside the Microsoft Store if that setting is restricted.
• Activation: the trial is activated on first start. In trial mode, a start window with a store link and a small banner may appear.
• Hardware: it runs on machines with as little as 1 GB RAM. Use the 64-bit build and more memory for large CBCT volumes; GPU acceleration speeds up 3D.
• Mac: Medixant only supports Windows. It explains how to run RadiAnt under CrossOver (paid) on macOS, warns that some features may fail, and advises disabling MAC address randomization to avoid activation problems.
• Update: version 2026.1 fixes a crash that a malicious JPEG-compressed DICOM file could trigger. Update older installations.

Limitations

• Medixant’s licence terms state that the program is not certified as a medical product and must not be used to make diagnostic or therapeutic decisions or to report imaging studies.
• Windows only. There are no Android, iPad or native Mac versions.
• No curved (panoramic) reconstruction, implant planning or dental-specific tools.
• Images created with MPR, 3D rendering or fusion cannot be exported back as DICOM.
• Continued use after evaluation requires a paid licence, and trial mode shows reminders.

RadiAnt DICOM Viewer vs alternatives

Weasis is the main free alternative: open source, cross-platform and able to build a panoramic view plus cross-sections from a CBCT with curved MPR. Horos covers Mac users for free, with curved MPR and STL export. For segmenting teeth or jaws and exporting 3D models, InVesalius and 3D Slicer are free, specialised options. RadiAnt’s strengths are speed, a small footprint and a very simple interface on Windows.

FAQ

Is RadiAnt DICOM Viewer free?

No. It is shareware (conditionally free): the trial includes every feature, and continued use requires a paid licence. The installer itself is free to download.

Is there RadiAnt DICOM Viewer for Mac?

There is no native Mac version. Medixant documents an unofficial workaround with CrossOver but does not support it. Mac users can choose Horos or Weasis.

Is there RadiAnt for Android or iPad?

No. RadiAnt runs only on Windows PCs.

Does RadiAnt work on Windows 11, 10 and 7?

Yes. The current installer supports Windows 7, 8, 8.1, 10 and 11 in both 32-bit and 64-bit editions.

How do I activate RadiAnt DICOM Viewer?

The trial activates on first start. To keep using it after evaluation, buy a licence from Medixant. Purchased licences are managed in the My Licenses area of the official site.

What are the system requirements?

Any PC running Windows 7 or newer. It works with 1 GB RAM, but large CBCT volumes and 3D rendering benefit from a 64-bit system, more memory and a supported GPU.

How do I use RadiAnt DICOM Viewer?

Open a DICOM folder, disc or file, pick a series from the thumbnail bar, and use the toolbar for measurements, 3D MPR and 3D VR. The official manual and video guides cover every tool.

What is a free alternative to RadiAnt?

Weasis is free and open source for Windows, macOS and Linux. Horos is free for Mac users.

Last checked against official sources: 26 September 2026 (developer website: radiantviewer.com). Versions and licence terms change — confirm on the developer's site before deploying in a clinic.