def _import_dcm():
    """DICOM Import function (checking for required libraries):
    DICOM support requires library `pydicom`"""
    import logging
    logger = logging.getLogger('pydicom')
    logger.setLevel(logging.CRITICAL)
    try:
        from pydicom import dicomio
    except ImportError:
        import dicom as dicomio
    logger.setLevel(logging.WARNING)
