REGION GROWING Segmentation

Region growing is a method by which the user defines a starting point (seed) within the object of interest, and the algorithm tries to find all connected pixels which fulfill a certain criterion.

After selecting REGION GROWING the following control elements appear.

P3D Region Growing

The slider and the number field serve for defining the pixel value. Together with the Direction radio button the criterion for pixel inclusion is formed.

= include all connected pixels with a value threshold ± Deviation;
>= include all connected pixels above the defined threshold value;
<= include all connected pixels below the defined threshold value.

A preview of the result is shown in the Input display if the Ovr (Overlay) box is checked, for example after clicking into a hot spot. To start the segmentation, navigate to a slice (in any direction) which shows the tissue of interest and click with the left mouse button onto a central point. Then adjust the criterion until the overlay indicates a promising segmentation.