@staticmethod
def determine_dicom_zipname(filenames, series_label):
    """Return a filename for the dicom series that is unique to a container

        Args:
            filenames (dict): A map of series uids to filenames
            series_label (str): The base to use for the filename

        Returns:
            str: The filename for the zipped up series
        """
    filename = series_label + '.dicom.zip'
    duplicate = 1
    while filename in filenames.values():
        filename = series_label + f'_dup-{duplicate}.dicom.zip'
    return filename
