| 摘要 |
The present invention provides a gadolinium complex in which gadolinium is coordinated with and covalently bonded to diethylenetriamine pentaacetic acid (DTPA) dianhydride of a pullulan-DTPA conjugate prepared by ester-bonding pullulan to DTPA, to a method for preparing same, to an MRI contrast agent composition containing the complex, and to a method for providing information for diagnosing a disease using the complex as an MRI contrast agent. The gadolinium-DTPA complex in which pullulan is ester-bonded to DTPA according to the present invention has a prolonged in vivo half-life, less toxicity, and a signal with a higher strength for providing a clearer MRI when compared with conventional gadolinium-DTPA complexes. Therefore, the gadolinium-DTPA complex of the present invention can not only be advantageously used as an MRI contrast agent but also produces MRI images in which a liver disease portion and a normal tissue portion can be discriminated, and can thus be used as an MRI contrast agent for the liver. |
