3D DICOM Viewer for CT & MRI
Cinematic Quality
Reveal anatomy that traditional viewers miss — photorealistic 3D rendering of CT and MRI volumes with synchronized MPR views, distance, angle, and ROI measurements, and adjustable tissue highlighting. Runs directly in your browser.
From scan to image in seconds
Load your data
- Open CT or MRI DICOM studies and image series — supports common DICOM transfer syntaxes, including uncompressed, RLE, and JPEG / JPEG 2000 (lossy and lossless) compressed images, from any scanner manufacturer.
- The browser demo uses preprocessed reference datasets. With Grenzwert Pro, DICOM files open directly from local storage — in the browser and in the native desktop app — processed locally and progressively organized for fast display.
See results immediately
- Visualization begins instantly and progressively refines to full detail. GPU acceleration ensures fluid rotation, zoom, and cropping even with large volumes.
- No need to wait for the complete dataset — start exploring anatomy right away with interactive frame rates.
Fine-tune the view
- Physically-based cinematic lighting reveals soft-tissue boundaries, vascular structures, and subtle density differences that standard renderers miss.
- Customize tissue highlighting to isolate bone, soft tissue, or vasculature with per-intensity opacity, color, and material control. Adjust Window/Level, crop regions of interest, and rotate freely — all in real time.
- Switch to synchronized MPR views — axial, coronal, and sagittal — and measure distances, angles, and ROI statistics with millimeter and Hounsfield Unit readouts.
See it in action
Watch Grenzwert render a CT volume in real time — cinematic lighting, tissue highlighting, and interactive cropping, right in the browser.
3D CT scan images from the viewer
These 3D CT images from the MANIX and MECANIX datasets show how the viewer renders CT scans: soft-tissue transfer functions, bone presets, transparent clipping volumes, and cinematic lighting.
Head CT soft-tissue volume rendering
A MANIX head CT dataset rendered with a soft-tissue transfer function for vascular and brain structure visibility.
Under the hood
A cross-platform C++ application that runs natively on Windows, macOS, and Linux — and in the browser via WebAssembly. Desktop-class rendering quality with zero-install convenience.
Rendering engine
- Built on DiligentCore — unified GPU abstraction across Direct3D, Vulkan, Metal, and WebGPU for consistent image quality on every platform
DICOM processing
- Industry-standard DICOM parsing via GDCM — reads CT and MRI data from any scanner manufacturer
Cross-platform
- Runs natively on Windows, macOS, and Linux. In the browser — compiled to WebAssembly via Emscripten with desktop-class rendering quality and zero-install convenience
Browser compatibility
The browser version requires WebGPU. Use Chrome or Edge on any modern desktop — no additional software or IT approval needed.
Chrome / Edge
SupportedVersion 142+ with full WebGPU and all required extensions including texture-formats-tier1.
Safari
Not supportedCrashes with an unknown error during WebGPU initialization. No diagnostic messages available.
Frequently asked questions
How can I view CT scan images in 3D?
Open the free demo in Chrome or Edge — the viewer renders CT scans as an interactive 3D image right in the browser, with no installation. You can rotate the sample datasets freely, highlight tissues, switch to MPR slices, and take measurements. Opening your own DICOM scans is coming with the Pro edition.
How does cinematic rendering improve medical volume visualization?
Cinematic rendering uses physically-based light simulation to produce photorealistic 3D images of CT and MRI scan data. Unlike conventional volume rendering, it reveals soft-tissue boundaries, vascular structures, and subtle density differences through natural lighting and shadowing. This level of visual clarity helps radiologists identify anatomical details that standard viewers may miss, and helps surgeons better understand complex anatomy during pre-operative planning.
Does the viewer support multi-planar reconstruction (MPR)?
Yes. Alongside the cinematic 3D view, the viewer provides synchronized axial, coronal, and sagittal MPR panes with a linked crosshair, slice navigation, and Window/Level control — directly in the browser, no installation required.
Can I measure distances, angles, and ROI statistics?
Yes. The MPR views include a distance ruler with millimeter readouts, a three-point angle tool, and rectangle and ellipse ROI tools that report area and voxel statistics — mean, minimum, maximum, and standard deviation, in Hounsfield Units for CT. Measurements stay anchored to the anatomy as you navigate slices.
Can I view DICOM files with this tool?
The browser demo uses preprocessed reference datasets for instant visualization — you can explore them in full 3D and MPR with measurement tools today. To open your own DICOM files, Grenzwert Pro is launching very soon — starting right in the browser: sign in and open CT and MRI DICOM series directly from local storage; your data stays on your machine and is never uploaded. Native desktop versions for Windows, macOS, and Linux will follow. Request early access to be notified at launch.
Which browsers support this 3D medical volume viewer?
The viewer runs in Chrome 142+ and Edge 142+, which support WebGPU. Firefox and Safari are not yet supported due to missing GPU extensions. Simply open the link in Chrome or Edge on any modern desktop — no installation, plugins, or IT approval required. The application loads directly in your browser and is ready to use within seconds.
Is this viewer suitable for clinical radiology?
This is a visualization and exploration tool for reviewing CT and MRI data with cinematic rendering quality. It is not yet FDA-cleared or CE-marked for clinical diagnostics. However, it is valuable for medical education, case presentation, surgical planning review, and research. Measurement tools (ruler, angle, rectangle and ellipse ROI) are built in, and Grenzwert Pro is being developed with regulatory compliance in mind.
Grenzwert Pro — Full DICOM Import
Grenzwert Pro unlocks full DICOM import — open your own CT and MRI studies directly from local storage and explore them with the complete toolset: cinematic rendering, MPR views, and measurements. Arriving first in the browser, with Windows, macOS, and Linux to follow. Request early access to be first in line.
DICOM Import
Load CT and MRI DICOM series from local storage — no preprocessing or format conversion required
Multi-Planar Reconstruction
Standard radiological views — axial, coronal, and sagittal — with synchronized cross-reference lines and Window/Level presets, on your own studies
Measurement Tools
Ruler, rectangle and ellipse ROI, and angle measurement with real-world millimeter and Hounsfield Unit readouts
Offline & Cross-Platform
Runs locally on Windows, macOS, and Linux — your data never leaves your machine.