Weasis is a standalone and web-based software for visualizing images obtained from medical imaging devices. This free DICOM viewer is used in healthcare by hospitals, health networks, multicenter research trials, and patients.

• General information
• Download binary releases
• Live Demo with different datasets
• Issues (Old Issue Tracker)
• Forum: Google group or GitHub Discussions

Release History

See CHANGELOG

Build Weasis

See How to build Weasis

General Features

• Open source DICOM viewer under EPL 2 or Apache 2 license
• Flexible integration with PACS, VNA, RIS, HIS, or PHR (see integration documentation)
• Desktop distributions (Windows, macOS, and Linux)
• Web access through weasis protocol
• Responsive user interface working well on high DPI screens
• Multi-language support
• Configuration of preferences on server-side and client-side
• API for building custom plug-ins
• DICOM Send (storeSCU and STOW-RS)
• DICOM Query/Retrieve (C-GET, C-MOVE and WADO-URI) and DICOMWeb (QUERY and RETRIEVE)
• Dicomizer module to convert standard images into DICOM files
• Embedded DICOM viewer in CD/DVD or other portable media

Viewer Features (see also Tutorials)

• Data type support

  • Display most DICOM files including multi-frame, enhanced, MPEG-2, MPEG-4, MIME Encapsulation, DOC, SR, PR, KOS, SEG, AU, RT, and ECG
  • Display DICOM image containing float or double data (Parametric Map)
  • Import and export DICOM CD/DVD with DICOMDIR
  • Import and export DICOM ZIP files
  • Viewer for common image formats (TIFF, BMP, GIF, JPEG, PNG, RAS, HDR, and PNM)

• Exporting data

  • Export DICOM files locally with several options (DICOMDIR, ZIP, ISO image file with Weasis, TIFF, JPEG, PNG...)
  • Send DICOM files to a remote PACS or DICOMWeb server (C-STORE or STOW-RS)
  • Save measurements and annotations in DICOM Presentation States or XML file

• Viewing and image rendering

  • Support of several screens with different calibration, support of HiDPI (High Dots Per Inch) monitors, full-screen mode
  • Image manipulation with mouse buttons (pan, zoom, windowing, rotation, scroll, crosshair)
  • Support of DICOM Modality LUTs, VOI LUTs, LUT Shapes, and Presentation LUTs (even non-linear)
  • Apply DICOM Presentation States (GSPS) and display graphics as overlays
  • Support DICOM Overlays, Shutters, and DICOM Pixel Padding
  • Volume rendering with 3D presets
  • Layouts for comparing series or studies
  • Advanced series synchronization options
  • Display cross-lines
  • Orthogonal Multi-planar Reconstruction (MPR) and 3D cursor
  • Maximum Intensity Projection
  • Persistent magnifier glass

• Measurement and annotation tools

  • Length, area, and angle measurement
  • Region statistics of pixels (Min, Max, Mean, StDev, Skewness, Kurtosis, Entropy)
  • Histogram of modality values
  • SUV measurement

• Specific viewers

  • DICOM ECG: display all the DICOM waveforms and allow to make some measurements
  • DICOM SR: structured report viewer with hyperlinks to images and associated graphics
  • DICOM AU: audio player (allow to export to WAV files)

• Other tools

  • Printing views to DICOM and system printers
  • Apply and Create DICOM Key Object Selection by selecting images with the star button
  • Display and search into all DICOM attributes
  • DICOM RT tools for radiotherapy: display RT structure set, dose, and DVH chart