ion of the phenotype image.
        Default is True.
    label_column : str, optional
        Name of the column in the atlas label CSV that contains numeric label indices.
        Default is &#39;Atlas Index&#39;.
    region_column : str, optional
        Name of the column in the atlas label CSV that contains region names.
        Default is &#39;Anatomical Name&#39;.

    Returns
    -------
    pandas.DataFrame
        A DataFrame with aggregated phenotype values (mean or sum) for each region, , indexed