# WEBdiCOM

> WEBdiCOM is a free, privacy-first, browser-based DICOM 3D viewer. Drag and drop
> a CT, MRI, or CBCT scan (a DICOM folder or a `.zip`) and it renders in 3D
> entirely in your browser — nothing is uploaded to any server.

WEBdiCOM runs 100% client-side using Cornerstone3D and VTK.js (WebGL2). When a
user opens a DICOM folder, `.zip`, or a direct file URL, the scan is read and
rendered locally on their device; patient data never reaches a server. This makes
it private by design (no protected health information is transmitted), fast (no
upload wait for large scans), and usable offline after the page loads.

It is intended for visualization, research, and education. It is **not** a
certified medical device and not for clinical diagnosis.

## What it does

- Loads classic single-file-per-slice DICOM series and Enhanced multiframe DICOM.
- 3D volume rendering with an adjustable transfer function (Threshold / Width /
  Opacity); the default threshold is auto-selected per scan via Otsu's method.
- Reads true 16-bit intensities directly from the DICOM pixel data.
- Shows scan metadata (modality, dimensions, manufacturer, etc.).
- Mouse orbit, zoom, 90° rotation, and view reset.

## Export

- NIfTI (`.nii.gz`) — for medical-imaging AI/ML pipelines (nnU-Net, MONAI).
- STL — surface mesh via marching cubes at the chosen threshold, for 3D printing
  or tools like Blender.
- PNG snapshot of the render.

## Pages

- [App](https://webdicom.pages.dev/): the viewer.
- [Privacy](https://webdicom.pages.dev/privacy): why data stays in your browser.

## Notes

- Free to use via the hosted app. Source is proprietary (all rights reserved).
- Built on open-source: Cornerstone3D, VTK.js, dicom-parser, fflate.
- Keywords: DICOM viewer, online DICOM viewer, 3D DICOM, CBCT viewer, CT viewer,
  MRI viewer, volume rendering, DICOM to STL, DICOM to NIfTI, web medical imaging.