Weasis is a multipurpose standalone and web-based DICOM viewer with a highly modular architecture. It is a very popular clinical viewer used in healthcare by hospitals, health networks, multicenter research trials, and patients.

Weasis DICOM viewer is cross-platform, free/libre and open source software (FLOSS), multi-language and allows a flexible integration to PACS, RIS, HIS or PHR. This multi-platform DICOM viewer runs with several processor architectures on Windows, Linux, and macOS (see the packages available for download). It allows high-quality renderings with high performance through the OpenCV library.

It has been designed to meet several expectations of clinical information systems and their future evolution regarding medical imaging: providing web-based access to radiological images, as well as covering a considerable number of DICOM types and offering multimedia capabilities.

Here are the main features:

• Display all kinds of DICOM files (including multi-frame, enhanced, MPEG-2, MPEG-4, MIME Encapsulation, SR, PR, KOS, AU, RT and ECG)
• Viewer for common image formats (TIFF, BMP, GIF, JPEG, PNG, RAS, HDR, and PNM)
• Image manipulation (pan, zoom, windowing, presets, rotation, flip, scroll, crosshair, filtering…)
• Layouts for comparing series or studies
• Advanced series synchronization options
• Display Presentation States (GSPS) and Key Object Selection
• Create key images (Key Object Selection object) by selection
• Support of Modality LUTs, VOI LUTs, and Presentation LUTs (even non-linear)
• Support of several screens with different calibration, support of HiDPI (High Dots Per Inch) monitors, full-screen mode
• Multiplanar reconstructions and Maximum Intensity Projection
• Display Structured Reports
• Display and search into all DICOM attributes
• Display cross-lines
• Measurement and annotation tools
• Region statistics of pixels (Min, Max, Mean, StDev, Skewness, Kurtosis, Entropy)
• Histogram of modality values
• SUV measurement
• DICOM Send (storeSCU and STOW-RS)
• DICOM Query/Retrieve (C-GET, C-MOVE and WADO-URI) and DICOMWeb (QUERY and RETRIEVE)
• Save measurements and annotations in DICOM PR or XML file
• Import CD/DVD and local DICOM files
• Export DICOM with several options (DICOMDIR, ZIP, ISO image file with Weasis, generate new UIDs, transcoding, TIFF, JPEG, PNG…)
• Magnifier glass with advanced display options
• Native and DICOM printing
• Read DICOM image containing float or double data (Parametric Map)
• DICOM ECG Viewer
• Dicomizer module to convert standard images into DICOM

Weasis can display the content of most DICOM files with a high level of implementation of the DICOM standard.