An MRI contrast composition includes a liposome and a europium metal complex disposed within the liposome. The europium metal complex includes a europium metal ion and a multi-dentate ligand selected from the group consisting of cryptands and thiacryptands and one or more counter-ions that balances a charge of the europium metal ion and the multi-dentate ligand, the europium metal ion being switchable between a 2+ and 3+ oxidation state. The contrast composition advantageously provides an oxidation-responsive dual-mode contrast agent because it would enhance either T1-weighted images or CEST images depending on the oxidation state of Eu.
MRI对比剂组合物包括一个脂质体和位于脂质体内的
铕金属配合物。
铕金属配合物包括一个
铕金属离子和从包括环
戊醚和
硫环
戊醚的羟基
配体中选择的多齿
配体,以及一个或多个平衡
铕金属离子和多齿
配体电荷的对离子,
铕金属离子可在+2和+3氧化态之间切换。该对比剂组合物具有氧化响应双模对比剂的优势,因为它会根据Eu的氧化态增强T1加权图像或CEST图像。