Features

Weasis features

This page lists the features supported by Weasis. For a step-by-step walkthrough of each tool, see the Tutorials.

Data type support

Display every common DICOM file, including multi-frame, Enhanced (CT / MR / US Volume), MPEG-2, MPEG-4, MIME-encapsulated documents, SR, PR, KOS, SEG, AU, RT, ECG, and Parametric Map (float / double pixels).
Modern transfer-syntax codecs — JPEG (baseline, extended, lossless), JPEG-LS, JPEG 2000, JPEG-XL, RLE, Deflated Explicit VR Little Endian.
Import and export DICOM CD/DVD with DICOMDIR.
Import and export DICOM ZIP archives (password-protected supported on import).
Viewer for common image formats: TIFF, BMP, GIF, JPEG, JPEG 2000, JPEG-XL, PNG, RAS, HDR, PNM.

Importing & exporting

DICOM Query / Retrieve — C-FIND, C-GET, C-MOVE, WADO-URI.
DICOMweb — QIDO-RS, WADO-RS, STOW-RS over HTTPS, configurable per source.
Send / Export — store to a PACS or DICOMweb server (C-STORE or STOW-RS); export locally as DICOMDIR ZIP, ISO image (with Weasis embedded on Windows x86-64), TIFF, JPEG, PNG, AVI / MP4.
Manifest-driven loading — supports XML manifests including DirectDownloadFile / DirectDownloadThumbnail for environments without a WADO server.
weasis:// protocol — single-click launch from web portals, EHR / RIS / HIS systems.
Save measurements and annotations as DICOM Presentation States (GSPS) or XML files.

Viewing & image rendering

Multi-monitor support with per-monitor calibration, HiDPI awareness, full-screen mode.
Image manipulation with the mouse (pan, zoom, windowing, rotation, scroll, crosshair) and customizable keyboard shortcuts.
Full DICOM rendering pipeline: Modality LUT, VOI LUT, LUT Shape (linear / sigmoid / logarithmic / non-linear), Presentation LUT.
Pseudo-color LUTs ordered by modality with preview.
DICOM Presentation States (GSPS) with graphic overlays.
DICOM Overlays, Shutters, and Pixel Padding.
Lossy-compression indicator in the information layer; visible warnings when the volume has geometry issues (irregular slice spacing, non-parallel slices, gantry tilt).
Per-view synchronization with explicit per-action overrides; FrameOfReferenceUID-aware grouping (orphan views are excluded from auto-sync to prevent comparing unrelated anatomy).
Manual synchronization as a fallback for views that don’t share a Frame of Reference, linked by relative slice index.

Advanced imaging

Oblique Multi-Planar Reconstruction (MPR) with gantry-tilt correction (backward mapping + trilinear interpolation) and 3D matrix transformations for non-standard patient positioning.
Curved MPR (CPR) — trace a curve on the axial plane, typically the dental arch on a cone-beam CT, to build a panoramic view and cross-sectional slices.
Maximum Intensity Projection (MIP / MinIP / Mean IP) available in the 2D, MPR and 3D views.
3D Volume Rendering with presets, an editor for custom Volume LUTs, and five segmentation modes — overlay, segmentation only, and two masks that keep or remove the voxels inside the visible regions.
DICOM Segmentation (SEG) overlaid in 2D, MPR, and 3D — BINARY, FRACTIONAL, and LABELMAP types, with per-region visibility, color, opacity, volume and statistics, Show all / Hide all (Alt + S), and non-diagnostic segments (table, couch) hidden on load.
PET/CT fusion — overlay a PET or SPECT series on its CT / MR base, in the 2D and MPR viewers, with a SUV display window and an on-image color scale.
DICOM RT — RTSTRUCT contours, RTDOSE isodose grid, and DVH chart (with optional on-the-fly DVH computation for missing structures).
4D / multi-phase series — automatic split into per-phase sub-series, with a confirmation dialog beyond 8 phases, ready for MPR / MIP / VR.
3D cursor (crosshair) and cross-lines linked through the Frame of Reference.
Persistent magnifier glass with freeze options for side-by-side parameter comparison.
Layouts for comparing series, studies, or modalities side-by-side.

Measurement & annotation tools

Measurement tools — line, polyline, perpendicular and parallel lines, angle (incl. Cobb angle), rectangle, ellipse, polygon and free-hand shapes, drawn at any angle and editable point by point.
Region statistics of pixels (Min, Max, Mean, StDev, Skewness, Kurtosis, Entropy).
OMBB (Oriented Minimum Bounding Box) for polygon length / width / orientation.
Histogram of modality values, including per-region histograms.
SUV measurement (PET / nuclear medicine), body-weight method (SUVbw), QIBA-compliant — also on a fused PET/CT view.
Volume and voxel count of segmented regions, with pixel statistics inside a region.
Pixel-info inspector (raw value, modality value, presentation value).

Specific viewers

DICOM ECG — display all DICOM waveforms with interactive measurements.
DICOM SR — Structured Report viewer with hyperlinks to images and associated graphics; standard graphic types (POINT, MULTIPOINT, POLYLINE, CIRCLE, ELLIPSE) plus compound types (MULTILINE, RULER, ARROW, RECTANGLE).
DICOM AU — audio player with export to WAV.
DICOM RT tools for radiotherapy: RTSTRUCT, RTPLAN, RTDOSE, DVH chart.

AI / quantitative imaging

Renders every common AI-produced DICOM object — SEG, RTSTRUCT, PR / GSPS, SR, Parametric Maps — with consistent overlays across 2D, MPR, and 3D. See the AI DICOM Objects page for the complete map of AI outputs to Weasis displays.
Float and double pixel data supported throughout the windowing / LUT pipeline.

Security & quality

Authentication & transport — Basic auth, OAuth 2.0, and OpenID Connect (Authorization Code with PKCE and loopback redirect, RFC 8252) — works against Keycloak, Google Cloud Healthcare, and any compliant OIDC provider; HTTPS for transport; code-signed installers.
Supply chain — SBOM-tracked dependencies, continuous CVE monitoring.
Static analysis — every build scanned by SonarCloud for reliability, maintainability, and security ratings; quality gate enforced on the main branch.
Upstream libraries — weasis-core-img and weasis-dicom-tools maintain their own ISO 14971-style risk-coverage matrices.
See Is Weasis a certified medical device? for the certification disclaimer.

Other tools

Dicomizer — convert standard images, videos, PDFs, and STL meshes into DICOM, with worklist-driven metadata, video-size validation, and per-modality presets.
DICOM printing — both standard printers and DICOM film printers.
Key Object Selection — flag key images with the star button, filter scrolling to those images, export as a standard KO object.
DICOM attributes — display and full-text search across every tag in the file.
Third-party launcher — hand off the current study (or its downloaded folder) to any external application, with dynamic placeholders such as {tag:AccessionNumber} or {dicom:wado.folder}.
Multi-language UI with 20+ translations contributed by the community.
Plugin architecture — the OSGi-based plug-in model lets vendors and research groups ship their own viewers and tools alongside Weasis (see Build plug-ins).