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The magnetic properties of some materials affecting MR images
Author(s) -
Josephson Lee,
Bigler Jeffrey,
White David
Publication year - 1991
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910220208
Subject(s) - superparamagnetism , paramagnetism , magnetization , magnetic susceptibility , ferritin , nuclear magnetic resonance , iron oxide , materials science , chemistry , chelation , gadolinium , magnetism , condensed matter physics , crystallography , inorganic chemistry , magnetic field , metallurgy , physics , biochemistry , quantum mechanics
Abstract We have compared the magnetic properties of various types of materials known to affect MR images. The materials compared were: (i) MR contrast agents based on chelates of paramagnetic metals (Gd‐DTPA, Dy‐DTPA); (ii) biological forms of iron (horse spleen ferritin and deoxyhemoglobin); and (iii) a superparamagnetic iron oxide (AMI‐25). The properties compared were the magnetic susceptibility and the magnetization. The magnetization and susceptibility of superparamagnetic AMI‐25 are far larger than that of ferritin or low molecular weight, paramagnetic chelates. Superparamagnetic iron oxide colloids, like AMI‐25, are a uniquely powerful class of magnetic materials. © 1991 Academic Press, Inc.