Abstract
ITK includes a number of iterators including the {\em itkImageLinearConstIteratorWithIndex} and {\em itkImageLinearIteratorWithIndex} that support visiting voxels along lines parallel to the image axes. This is particularly useful for separable filters. This article introduces modified versions that do not maintain location index so that filters that don't require index information can perform faster. Preliminary tests indicate that the iteration speed is improved, but that filters such as the RecursiveSmoothingGaussianImageFilter do not change significantly.