typedef itk::ImageRegionConstIterator<typename TransformType::CoefficientImageType> Iterator;
Iterator it (coefficientImage, coefficientImage->GetLargestPossibleRegion() );
it.GoToBegin();
typedef itk::ImageRegionConstIterator<typename TransformType::CoefficientImageType> Iterator;
Iterator it (coefficientImage, coefficientImage->GetLargestPossibleRegion() );
it.GoToBegin();