p[0] = p[1] = p[2] = 0.0; // to avoid warning
clitk::FindExtremaPointInAGivenDirection<MaskImageType>(PulmonaryTrunk, GetBackgroundValue(), 2, false, p);
p[2] += PulmonaryTrunk->GetSpacing()[2];
p[0] = p[1] = p[2] = 0.0; // to avoid warning
clitk::FindExtremaPointInAGivenDirection<MaskImageType>(PulmonaryTrunk, GetBackgroundValue(), 2, false, p);
p[2] += PulmonaryTrunk->GetSpacing()[2];