摘要:
Milieux de contraste pour imagerie comportant un complexe polynucléaire tolérable physiologiquement (tel que défini dans la revendication 1). Ledit complexe polynucléaire contient au moins deux, et de préférence trois, atomes augmentant le contraste. Dans les techniques d'imagerie par rayons X ou par ultrasons, on utilise des atomes de métaux lourds pour augmenter le contraste, tandis qu'en imagerie par résonance magnétique les atomes de métaux paramagnétiques servent à augmenter le contraste. Les atomes d'augmentation de contraste préférés sont le molybdène et le tungstène. On peut également utiliser le milieu en thérapeutique.
摘要:
The present invention relates to macrocyclic chelating agents, optionally possessing more than one macrocyclic ring but typically characterised by their possession of at least two peptide linkages within the macrocyclic skeleton. These chelating agents may be used for example for the preparation of paramagnetic metal chelates for use as MRI contrast agents.
摘要:
There are provided polychelants and their metal chelates which are useful in diagnostic imaging and in radiotherapy and which comprise a plurality of macrocyclic chelant moieties, e.g. DOTA residues, conjugated to a polyamine backbone molecule, e.g. polylysine. To produce a site-specific polychelate, one or more of the macrocyclic chelant carrying backbone molecules may be conjugated to a site-directed macromolecule, e.g. a protein.
摘要:
Composés comprenant des mailles moléculaires étroites, de préférence incurvées dans un ou deux sens, tels que des fullerènes ou des métallocarbohéchanes et pouvant s'utiliser en tant qu'agents diagnostiques ou thérapeutiques ou en tant que véhicules de ceux-ci, particulièrement des agents de contraste d'imagerie diagnostique.
摘要:
The disclosure provides the use of a physiologically compatible chelate complex of a chelating compound and a paramagnetic ion of a lanthanide element having an atomic number in the range 57 to 70 or of a transition metal having an atomic number selected from 21 to 29, 42 and 44 and of a non-paramagnetic organic calcium salt for the preparation of a magnetic resonance imaging contrast medium by admixture of said complex and said organic salt. The admixed calcium serves to enhance the biotolerability of the paramagnetic chelate containing MRI contrast medium.
摘要:
Homologs of Diamide-DTPA-Paramagnetic compounds (such as diamido acetyl diethylene triamine triacetic acid) provide excellent contrast agents for magnetic resonance (MR) imaging. The magnetic dipole generated by the unpaired electron within the paramagnetic (PM) atom, causes a local reduction in the bulk magnetic field of the MR system. The resulting shortening of the T1 (spin lattice) relaxation time in the local hydrogen protons within the area of interest, causes an intense "free induction signal" and a corresponding modulation in the collected scanning data. The tissue or organ of interest appears on the MR display highlighted in white. Background tissue is displayed as darker or lower intensity greys. A surface highlighted image of the small and large intestine may be obtained by venous injection of the diamide contrast agent. The contrast agent is formed by replacing two carboxylic acids on the DTPA chelator with functional amide groups. The homologs enable the Diamide-DTPA-PM contrast agents to go into solution readily, and promote organ selectivity.
摘要:
There is provided a liposomal agent comprising liposomes having bound to a membrane thereof a chelated diagnostically or therapeutically effective metal ion, the chelating agent binding said metal ion having a macrocyclic chelant moiety with attached to a single ring atom thereof a lipophilic membrane associating moiety.