The composition for increase of MRI contrast in visualizing the alimentary canal of the patient

摘要

The invention provides, as contrast signal generators in MR imaging of the digestive tract, paramagnetic metal chelates of novel acrylic compounds of formula C(R1R2)=CR3-CO-Z-Z (1) and/or C(R1R2)=CR3-CO-Z-Z-Z-CO-CR3=C(R1R2) (2) in monomer, oligomer, homopolymer and copolymer forms, in which the R1, R2 and R3 represent H or saturated or unsaturated C1-10 aliphatic radicals optionally substituted by one or more OH groups; Z is a covalent bond or a linker spacer and A is a moiety capable of fixing a paramagnetic metal by chelation. Compounds of type (1) useful in the present invention are, for instance the polyalkylene-aminopolycarboxylic acids such as NTA, EDTA, DTPA, DOTA and like structures, possibly involving additional substituents; an example is the compound BOPTA which is a DTPA derivative carrying a benzyloxypropyl group.