def create_header(shape, dtype, order='C', header=None):
    """Create a header for the MRC image format.

    @todo support header parameters

    :Parameters:

    shape : tuple
            Shape of the array
    dtype : numpy.dtype
            Data type for NumPy ndarray
    header : dict
             Header values  for image
    :Returns:

    h : dtype
        Data type for NumPy ndarray describing the header
    """
    pass
