This class has been grabbed and modified from source tree of ITKv4. In its original version this class segments all the pixels/voxels with an intensity within the threshold interval [lower,upper] provided by the user. In this modified version, the user is asked to only provide the upper threshold and the pixels/voxels below it are considered. In order to do so, the ThresholdBelow instead of the ThresholdBetween method is used.
Merge branch 'master' of https://github.com/PietroNardelli/Slicer-AirwaySegmentation