radiogram vs radiography

radiogram

noun
  • A radiograph 

  • An entertainment device that combined a radio and a record player or gramophone. 

  • A message, like a telegram, transmitted by radio rather than wires. 

radiography

noun
  • the process of making radiographs, and the science of analyzing them 

How often have the words radiogram and radiography occurred in a corpus of books? (source: Google Ngram Viewer )