int maskExtent[6];
ComputeExtent(orientation, mSlice, imageExtent, maskExtent);
ComputeExtent(maskExtent, maskExtent, mSlicer->GetImage()->GetFirstVTKImageData(), mImage->GetFirstVTKImageData());
int maskExtent[6];
ComputeExtent(orientation, mSlice, imageExtent, maskExtent);
ComputeExtent(maskExtent, maskExtent, mSlicer->GetImage()->GetFirstVTKImageData(), mImage->GetFirstVTKImageData());