Disclosed are x-ray contrast compositions for oral or retrograde examination of the gastrointestinal tract comprising a polymeric material capable of forming a coating on the gastrointestinal tract and an x-ray producing agent of the formula ##STR1## and methods for their use in diagnostic radiology of the gastrointestinal tract wherein R=C.sub.1 -C.sub.25 alkyl, cycloalkyl, unsaturated allyl or halo-lower-alkyl, optionally substituted with halo, fluoro-lower-alkyl, aryl, lower-alkoxy, hydroxy, carboxy, lower-alkoxy carbonyl or lower-alkoxy-carbonyloxy, (CR.sub.1 R.sub.2).sub.p --(CR.sub.3 .dbd.CR.sub.4).sub.m Q, or (CR.sub.1 R.sub.2).sub.p --C.tbd.C--Q; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently H, lower-alkyl, optionally substituted with halo; n is 1-5; m is 1-5; p is 1-10; and Q is H, lower-alkyl, lower-alkenyl, lower-alkynyl, lower-alkylene, aryl, or aryl-lower alkyl.
揭示了用于口服或逆行检查消化道的X射线造影剂,包括能够在消化道形成涂层的聚合物材料和具有以下结构的X射线产生剂的方法:##STR1##以及它们在消化道诊断放射学中的使用方法,其中R = C.sub.1 -C.sub.25烷基,环烷基,不饱和烯丙基或卤代较低烷基,可选择地用卤素,
氟代较低烷基,芳基,较低烷氧基,羟基,羧基,较低烷氧基羰基或较低烷氧基羰氧基取代,(CR.sub.1 R.sub.2).sub.p--(CR.sub.3.dbd.CR.sub.4).sub.m Q,或(CR.sub.1 R.sub.2).sub.p--C.tbd.C--Q;R.sub.1,R.sub.2,R.sub.3和R.sub.4独立地为H,较低烷基,可选择地取代卤素;n为1-5;m为1-5;p为1-10;Q为H,较低烷基,较低烯烃基,较低
炔烃基,较低烷基,芳基或芳基-较低烷基。