code: def extract_dicommetadata(self, token, item_id):
          
          parameters = dict()
          parameters['token'] = token
          parameters['item'] = item_id
          response = self.request('midas.dicomextractor.extract', parameters)
          return response
docs: Extract DICOM metadata from the given item
  
          :param token: A valid token for the user in question.
          :type token: string
          :param item_id: id of the item to be extracted
          :type item_id: int | long
          :return: the item revision DAO
          :rtype: dict