unique_segmentation_labels
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.. py:function:: petpal.preproc.segmentation_tools.unique_segmentation_labels(segmentation_img: ants.core.ANTsImage | numpy.ndarray, zeroth_roi: bool = False) -> numpy.ndarray

   Get a list of unique ROI labels in a segmentation image.

   :param segmentation_img: Segmentation image or array with
                            integer labels for distinct ROIs.
   :type segmentation_img: ants.core.ANTsImage | np.ndarray
   :param zeroth_roi: Determines whether region index zero should be included as a unique
                      region. If True, ``0`` is included in output list, otherwise is not included. Default
                      False.
   :type zeroth_roi: bool

   :returns: *labels (np.ndarray)* -- Array of unique integers in the segmentation image.