Modes of Statistics Calculation

The following statistics modes are supported:

• Selected Statistics: Apply the VOIs to the current image and shows the results of the configured statistics measures on a panel.
• Statistics: Apply the VOIs to the current image and show the resulting statistics on a panel.
• Multi-Statistics: Apply the VOIs to all loaded images and show the resulting statistics on one panel per image. The outcome can then easily be merged into an aggregate.
• File-Statistics: Apply the VOIs to a set of image files and save the resulting statistics in a file. This procedure requires explicit image loading and is most useful when the images are in a normal (e.g. MNI) space, so that a standard set of VOIs can be applied.
• Pixel Dump: Extract the values in all classified VOI pixels of the selected image and save the values together with the pixel coordinates in a file. This procedure gives the user the full raw data and allows him implementing his own statistical analysis.
• Histograms: Extract the values in all classified VOI pixels and calculate a histogram per VOI showing the value distribution.
• Textures: Quantifies the variability of the pixel intensities within a structure such as a tumor. With this selection 25 texture features within the VOIs will be estimated.

VOIs used for Statistics

The following VOIs are considered in the interactive statistics calculation:

• All contour VOIs on the List tab.
• The VOI named Group which consists of all the contour VOIs selected on the Group tab.
• If on the Template tabs Atlas or Mask is active, the corresponding VOIs are also considered. Please enable the Ovr box to see these VOIs in the overlay.
• If a masking operation is configured on the Atlas or Mask sub-tab, it is applied to the contour VOIs during the statistics. Please enable the Fill ROI box to verify the actual coverage of the masked contour VOIs.