Paramagnetic metal ion-based macrocylic magnetization transfer contrast agents and method of use
申请人:Board of Regents, The University of Texas System
公开号:US20020127182A1
公开(公告)日:2002-09-12
The present invention is directed, in general, to contrast agents (CA), and methods and systems of using such agents for producing image contrast based on a magnetization transfer (MT) mechanism. The CA comprises a tetraazacyclododecane ligand having pendent arms R, R′, R″ and R″′ that are amides having a general formula: —CR
1
H—CO—NH—CH
2
—R
2
. R
1
includes organic substituents and R
2
is not hydrogen. A paramagnetic metal ion (M) is coordinated to the ligand. The method, comprises subjecting a CA, in a sample, to a radio frequency pulse. The CA has pendent arms R, R′, R″ and R″′ comprising organic substituents and the ligand further includes a M and a water molecule. A signal is obtained by applying a radio frequency pulse at a resonance frequency of the water molecule. The magnetic resonance system, comprises a magnetic resonance apparatus and the CA, the agent containing a ligand having the above described general formula.
本发明一般涉及造影剂(CA),以及使用这种造影剂产生基于磁化转移(MT)机制的图像对比的方法和系统。CA 包括四氮杂环十二烷配体,该配体具有下垂臂 R、R′、R″和 R″′,它们是具有通式的酰胺:-R
1
H-CO-NH-CH
2
-R
2
.R
1
包括有机取代基,R
2
不是氢。顺磁性金属离子(M)与配体配位。该方法包括将样品中的 CA置于射频脉冲下。CA 具有由有机取代基组成的垂臂 R、R′、R″和 R″′,配体还包括 M 和水分子。通过在水分子的共振频率上施加射频脉冲可获得信号。磁共振系统,包括磁共振装置和 CA,该剂含有具有上述通式的配体。