[Theoretical considerations for improving oral cholegraphy (author's transl)]

Oral cholegraphy is one of the most accurate procedures in diagnostic radiology. Nevertheless it is not without shortcomings. To achieve an enhancement of its reliability the biochemical and physiological processes involved in an ultimately sufficient biliary-tract opacification are analysed. From these theoretical considerations some conclusions are drawn which could be important for the improvement of oral cholegraphy and which appeared to be worth testing in practice.