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Weasis is a DICOM viewer available as a desktop application or as a web-based application.

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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.

Release History

See CHANGELOG

Build Weasis

See How to build Weasis

General Features

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