Characterization of magnetic nanoparticles as contrast agents in magnetic resonance imaging using high-Tc superconducting quantum interference devices in microtesla magnetic fields

Shu Hsien Liao, Hong Chang Yang, Herng Er Horng, S. Y. Yang

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23 Citations (Scopus)


In this paper, we characterize the spin-lattice relaxation T1, spin-spin relaxation T2, and effective relaxation rate ΓMF of magnetic fluids for magnetic resonance imaging using a high-Tc superconducting quantum interference device (SQUID) in microtesla magnetic fields. When the magnetic susceptibility of the magnetic fluid was increased, a broadening of proton nuclear magnetic resonance spectra and a growing spin-lattice relaxation T1 as well as spin-spin relaxation T2 were observed. The effective relaxation rate ΓMF increased monotonically from 0 to 13 s-1 when the magnetic susceptibility of the magnetic fluids, relative to tap water, was increased from 0 to 0.0015 emu g-1. We demonstrate the magnetic fluid as an image contrast via a high-Tc SQUID in microtesla magnetic fields.

Original languageEnglish
Article number025003
JournalSuperconductor Science and Technology
Issue number2
Publication statusPublished - 2009 Apr 27


ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys

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