[X-ray format and dose (author's transl)].

The paper discusses conventional roentgenographic methods and image amplifier fluorography. 1. Reduction of the required dose in conventional roentgenographic examinations has been achieved by the use of CaWO4 special foils, or , to an even greater extent, on rare earth basis (lanthanum oxibromide). 2. A considerably greater reduction in dose is achieved with image amplifier fluorography of medium format. 3. The possibilities offered by both systems are discussed. Possible future developments are examined.