eroded_wm_segmentation
========================================================

.. py:function:: petpal.preproc.segmentation_tools.eroded_wm_segmentation(input_segmentation_path: str, out_segmentation_path: str | None, eroded_wm_region_mapping: int = 1) -> ants.ANTsImage

   Generates eroded white matter region on a segmentation image and merges it into the image,
   saving result as a new segmentation image.

   Requires FreeSurfer segmentation with original label mappings.

   :param input_segmentation_path: Path to input freesurfer segmentation, such as aparc+aseg or
                                   wmparc.
   :type input_segmentation_path: str
   :param out_segmentation_path: Path to output segmentation image with replaced values in
                                 eroded whited matter region.
   :type out_segmentation_path: str
   :param eroded_wm_region_mapping: Segmentation mapping for the eroded white matter region in
                                    the output image. Default "1".
   :type eroded_wm_region_mapping: int

   :returns: *seg_img (ants.ANTsImage)* --

             Input segmentation image with values in eroded white matter
                 replaced with `eroded_wm_region_mapping`.

   .. seealso::

      :meth:`~petpal.preproc.segmentation_tools.vat_wm_ref_region` - function that generates the
          eroded white matter region.