METAL CHELATE COMPLEX, PROTON RELAXATION RATE ENHANCING AGENT AND MRI CONTRAST AGENT

摘要

It is intended to provide a proton relaxation rate enhancing agent, an MRI contrast agent or an intracellular retained MRI contrast agent, which enables monitoring over time of a compound that can be stay at a fixed site for a long time without moving in and out of the cell membrane and the state of tissues in a fixed area, particularly the process of regeneration by cell transplantation. A metal chelate complex, characterized by comprising one or more metal chelates and polyvinyl alcohol as constituents, and a proton relaxation rate enhancing agent, an MRI contrast agent or an intracellular retained MRI contrast agent, characterized by comprising the same.