paramagnetic substance

paramagnetic substance

a substance with positive magnetic susceptibility resulting from the presence of unpaired atomic electrons (e.g., gadolinium chelates). These substances enhance magnetic relaxation and are often used as contrast agents in magnetic resonance imaging.
References in periodicals archive ?
ESR is a branch of absorption spectroscopy in which radiation having frequency in the microwave region is absorbed by paramagnetic substances to induce transitions between magnetic energy levels of electrons with unpaired spins.
As paramagnetic substances, iron in ferrous and ferric states (deoxyhemoglobin, methemoglobin, and hemosiderin) can shorten T1 and T2.