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The magnetic properties of some materials affecting MR images

✍ Scribed by Lee Josephson; Jeffrey Bigler; David White

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
292 KB
Volume
22
Category
Article
ISSN
0740-3194

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✦ Synopsis

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.

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