WILHELM KONRAD VON RÖNTGEN published his epochal paper, Eine neue Art von Strahlen, in December, 1895. Within a few months the knowledge of his rays had spread with incredible rapidity; many investigators started application of them to their special realms.
The apostle for rhinolaryngology in general, and for phonetics in particular, was Max Scheier in Berlin. The interval of only a year and a half from the discovery of the rays was needed by Scheier before he announced, on June 10, 1897, a lecture at a congress for internal medicine in Frankfurt am Main entitled, "The Application of X-Ray in the Physiology of the Voice and the Speech." This paper probably must be considered as the first on the topic in question.
Scheier's presentation reflected by no means a "fleeting purpose," as he followed it in the same and the next year by papers given in Brunswick and in Berlin,
MACMILLAN AS, KELEMEN G. RADIOGRAPHY OF THE SUPRAGLOTTIC SPEECH ORGANSA Survey. AMA Arch Otolaryngol. 1952;55(6):671–688. doi:10.1001/archotol.1952.00710010686004