There are three primary viewers for use with the OnePacs system, as detailed below. 

OnePacs may also be used with the DICOM viewer of the user's choice. 

Compatibility:

• MacOS, Windows 7+.  Likely works on Linux but has not been tested by OnePacs.

Benefits:

• Full-fledged diagnostic viewer, permissible for diagnostic use in the United States according to FDA regulations, CE certified
• Runs in a Java WebStart application. Does not require installation of the full OnePacs Desktop Workstation viewer and study download package.
• Ideal for users who occasionally wish to review cases using a full-fledged diagnostic quality viewer

Disadvantages:

• Cases are loaded into memory on a one-off basis, for each case that is viewed. No study prefetching or local study storage.

The Java based viewer is ideal for users who wish to occasionally review cases using a full-fledged diagnostic quality viewer. For example, an orthopedic surgeon or other referring physician who may need to review only one or a small number of cases may find this viewer optimal, as it installs quickly as a web browser-based Java application, and may be run on a wide variety of hardware, including hospital PCs for which the user may not wish to install permanent software, and/or for which the user may not have Administrative privileges. 

Use of the Java web viewer is described here. 

Compatibility:

• macOS, Windows 7 SP1+ (64-bit)

Benefits:

• Full-fledged diagnostic viewer, permissible for diagnostic use in the United States according to FDA regulations.
• Full range of diagnostic image manipulation and display tools
• Study pre-fetching for fast, efficient readouts

Drawbacks:

• Installation requires administrative capabilities on the target workstation.
• Requires installation of permanent software packages (which may not be desirable on public computers)

The OnePacs Diagnostic Workstation is the primary viewer for diagnostic use with OnePacs. 

Compatibility:

• macOs, Windows (64-bit)

Benefits:

• Allows any viewer which supports DICOM c-store to be used with OnePacs
• On MacOS, allows third party viewers such as Horos or Osirix to be used as a viewer for OnePacs

Drawbacks:

• Integration with the full OnePacs system may be limited compared to OnePacs Workstation

By configuring the OnePacs Study Retriever to retrieve studies and store studies to the locally installed viewer or viewers of the users' choice, it is possible to use a wide variety of viewers with OnePacs. Details can be found here.

For selecting a specific viewer for use in reviewing one particular case, the viewer may be selected either from the right-click context menu from the OnePacs worklist, or, the desired viewer may be selected by clicking on the viewer-specific display icon, in locations where such icons are displayed.