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.
磁共振成像造影剂组合物包括脂质体和置于脂质体中的
铕金属复合物。
铕金属复合物包括一个
铕金属离子和一个选自隐色体和
硫隐色体的多齿
配体,以及一个或多个平衡
铕金属离子和多齿
配体电荷的反离子,
铕金属离子可在 2÷ 和 3÷ 氧化态之间切换。这种造影剂组合物具有氧化反应双模式造影剂的优点,因为它可以根据 Eu 的氧化态增强 T1 加权图像或 CEST 图像。