How to use the viewer

A viewer is an application that is used to view images and algorithm results and to run a reader study. The default viewer is Cirrus Core, which gets updated with new features every 5 weeks.

Starting a viewer

You can start a viewer in several ways:

  • from an Algorithm > Results > Open Result in Viewer to view the results of an algorithm
  • from a ReaderStudy > Information > Launch this Reader Study to start a reader study
  • from a ReaderStudy > Cases > View/Delete Cases > View Case to view individual images
  • from an Archive > View Cases > View Case to view individual images

Once you have started the viewer you will see a screen similar to this (in this case a reader study):

The screen consists of the following sections:

You can use the navbar to access the documentation, your profile, and general information about the viewer. For more information on configuring the viewer, click here.

Plugin panel

The plugin panels show all the plugins relevant to how you are using the viewer, and how the viewer is configured. A number of plugins are optional and can be configured in the viewer configurations, see documentation here and here.


The tools panel shows the tools that can be used to interact with the image, such as zoom, pan, and scroll, depending on the type of image displayed. The active tool will always respond to the left mouse button. The other mouse buttons are linked to default interactions:

  • Middle mouse button: Window width/center
  • Right mouse button: Scroll
  • Left + middle mouse button: Pan
  • Right + middle mouse buttons: Zoom

The viewer shows one or more images. If the images are linked (through the button in the display plugin or by using the L-key) scroll and zoom interactions will work on all images. You can make an image full-screen by either double-clicking anywhere on the image or by using the button. For 3D images, the current slice, orientation, mouse location, and voxel value are displayed in the bottom left corner. For pathology images, a minimap is displayed showing the image overview and the areas that have been viewed at higher zoom levels:

Clicking on a location in the minimap will select that location in the main viewer. The minimap can be moved by dragging the button.