We have found some inter-operator variability in the interpretation an segmentation of obstetric data sets. Now it is possible for the user to toggle to a volume rendered view of the partially segmented data. They can now cut away the data from any viewpoint, thereby editing their manually drawn contours in a very efficient manor. The contour is then augmented. When a user edits an interpolated contour the slice status changes to be user-defined and the contours change colour from red to green.
Blue signifies cutting or subtracting, green also means adding.
The user can build up a contour in parts. This is useful for large or complex objects. As the user edits or adds contours the total volume is updated top-right on the window. In this way the user gains an idea of how coarse the current segmentation is. If the volume changes only by small amounts then the current accuracy is sufficient.