ROI Tool

The term Region of Interest (ROI) is used throughout the tutorial as a synonym for a "Mask", "Binary Mask", "Segmentation" or "Volume of Interest". Technically, it is a binary 3D volumetric image matrix, which is quite similar to 3D image apart from the fact that voxel values are binary (on or off). Thus, a ROI has also the same properties as image (like resolution and matrix size).

ROIs can , also be 2D, however, one has to be remember that the 2D slice has also a position in 3D space, which can sometimes be confusing.
ROIs are close to what is represented by DICOM SEG objects. 

 

To open the ROItoolROI-tool just go throughvia the toolbox menu of therthe vertical iconbar or use the shortcut:shortcut via the "pen" icon:

                           

 

This

 

opens

 the following toolbox window, which contains the access to all functionalities of the ROI-tool

 

 

Creating a ROI

 

Pen Options

ROI statistics