title: [Substraction in gastrointestinal angiography (author's transl)].
abstract: On the basis of a comparative study of 100 angiograms, the authors stress the value of photographic substraction in gastrointestinal angiography. From a technical viewpoint, after a brief review of the theoretical background, the authors emphasise the need to use reproductions of different tonality, and the problems of blurring due to movement, which may be overcome by the use of an effective premedication (diazepam) and by limiting the substraction to a very limited arca. From the standpoint of results, photographic substraction gives improved radiological data in the arterial phase in 60% of cases. This improvement concerns the prevertebral vessels. During the venous phase, in all cases there is an improvement in mesenterico-portal return and the visualisation of oesophageal varices. In all, photographic substraction, a simple technique, appears to be of value in gastrointestinal angiography essentially in the arteriographic study of the pancreas and of spleno-portal and mesenterico-portal venous return.
mesh_terms: D000792:Angiography / Q000379:methods*; D004064:Digestive System / Q000098:blood supply*; D004932:Esophageal and Gastric Varices / Q000000981:diagnostic imaging*; D005767:Gastrointestinal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D010179:Pancreas / Q000098:blood supply*; D013382:Subtraction Technique
vernacular_title: La soustraction en angiographie digestive