Adequate parameters for quality assurance in radiodiagnosis

Criteria are, discussed which a set of parameters must have, to be suitable in practical use for quality assurance in radiodiagnosis. The choosen parameters are described by: 1. definition; 2. a method for measurement; 3. absolute values and tolerances. Only film- processing and radiological standard-methods are described, that means direct radiography and fluoroscopy with image- intensifier. Digital methods (DSA or CT), special techniques (tomography) and applications in dentistry (panorama) are not regarded. Some first experiences concerning the most common faults of radiographic equipment are mentioned. (author)