How to use the viewer

A viewer is the 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:

Navbar

The navbar shows which viewer is used, your username, and a button to open the keybindings panel. For more information on configuring keybindings, click here. The username has a drop down offering you these options:

  • Profile: Open a new tab to your profile page on Grand Challenge
  • Help: Open a new tab to this documentation page
  • Sign out. Open a new tab to the Sign out page on Grand Challenge. If you use the sign out option, you will need to refresh the viewer to close your session.
Plugin panel

The plugin panels shows all the plugins relevant for 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.

Tools

The tools panel shows the tools that can be used to interact with the image, such as zoom, pan, 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
Viewer

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.