Characterizing the field-dependent T1-relaxation and imaging of ferrofluids using high-Tc superconducting quantum interference device magnetometer in low magnetic fields

Shu-Hsien Liao, Hong-Chang Yang, Herng-Er Horng, C. W. Liu, H. H. Chen, M. J. Chen, K. L. Chen, C. I. Liu, L. M. Wang

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Abstract

In this paper, we investigate the field-dependent T1-relaxation and T1-contrast imaging of ferrofluids using high-Tc superconducting quantum interference device (SQUID)-detected nuclear magnetic resonance and imaging in low magnetic fields, where T1 is the spin-lattice relaxation time. It was found that the 1/T1 of ferrofluids increases when the prepolarization field increases. We attribute this to the enhanced magnetic-field gradients generated from the induced magnetization that accelerates the T1-relaxation more in a high strength of fields in comparison to a low strength of fields. Using phantoms with different relaxation times, the T1-contrast images are demonstrated in low magnetic fields, which can be promising for discriminating tumors.

Original languageEnglish
Article number123908
JournalJournal of Applied Physics
Volume112
Issue number12
DOIs
Publication statusPublished - 2012 Dec 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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