[Filmsizes; physical-technical aspects of x-ray image recording (author's transl)].

Formats of full-size radiographs are determined by the dimensions of the anatomy to be recorded, the enlargement factor is always larger than unity. Given a certain film screen combination exposure and film-density cannot be chosen independently--whereas with X-ray I.I. fluorography this is possible. In the former case they depend on X-ray absorption, energy efficiency and the luminescent spectral emission of the screens in combination with the corresponding characteristics of the photographic film. The respective characteristics of standard film-screen combinations and those based on rear earth screens are discussed and compared. X-ray image intensifier fluorography is presented as a logical enlargement of I.I. fluoroscopy, in itself and indispensable tool in X-ray diagnostics. Its real or imaginary pro's and con's are elucidated.