An improved contrast agent for magnetic resonance imaging comprises particles to each of which is coupled a multiplicity of chelating agents containing paramagnetic ions. In the improved agent, the position of the ion is offset from the surface of the particle so as to improve the relaxivity imparted by the contrast agent.
一种用于磁共振成像的改进型造影剂由颗粒组成,每个颗粒上都耦合了多种含有顺磁离子的
螯合剂。在改进型造影剂中,离子的位置偏离颗粒表面,以提高造影剂的弛豫性。