摘要/Abstract

磁共振成像技术被广泛应用于诊断医学和软组织成像，而磁共振对比剂有助于提高成像对比度.报道了一类共十二种基于钆-1，4，7，10-四氮杂环十二烷-1，4，7，10-四乙酸（DOTA）-酰肼结构的新型磁共振对比剂的设计、合成及性能表征.0.5 T磁场下测得的弛豫率结果显示，对比剂5d、5h和5l的纵向弛豫率优于临床使用对比剂Gd-DOTA，分别达到4.67、4.85和5.33 L·mmol^-1·s^-1.进一步动物活体体内肝靶向磁共振成像研究显示，对比剂5d具有作为肝靶向磁共振对比剂的应用潜力.
关键词: 磁共振成像, 对比剂, 肝靶向, DOTA-酰肼, 钆, 合成
Magnetic resonance imaging (MRI) is widely used in diagnostic medicine and soft tissue imaging. Contrast agents (CAs) can improve the specificity of MRI enhancement. Herein, the design, synthesis and characterization of twelve novel Gd-based 1,4,7,10-tetraazacyclododecan-N,N',N,N'-tetraacetic acid (DOTA) -hydrazide derived contrast agents for MRI were reported. Among of them, 5d, 5h and 5l exhibit higher longitudinal relaxivities than the clinical Gd-DOTA at 0.5 T. The relaxivities r₁ of 5d, 5h and 5l are 4.67, 4.85 and 5.33 L·mmol^-1·s^-1 respectively. In vivo liver-target MRI shows that the potential of complex 5d was used as a novel liver-target contrast agent for MRI.
Key words: magnetic resonance imaging (MRI), contrast agents, liver-target, DOTA-hydrazide, gadolinium, synthesis


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