Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 53, Issue 1, Pages 9-14Publisher
WILEY
DOI: 10.1002/mrm.20316
Keywords
low-field MRI; SQUID; T-1-weighted contrast; relaxation dispersion
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T-1-weighted contrast MRI with prepolarization was detected with a superconducting quantum interference device (SQUID). A spin evolution period in a variable field between prepolarization and detection enabled the measurement of T-1 in fields between 1.7 muT and 300 mT; T, dispersion curves of agarose gel samples over five decades in frequency were obtained. SQUID detection at 5.6 kHz drastically reduces the field homogeneity requirements compared to conventional field-cycling methods using Faraday coil detection. This allows T-1 dispersion measurements to be easily combined with MRI, so that T-1 in a wide range of fields can be used for tissue contrast. Images of gel phantoms with T-1-weighted contrast at four different fields between 10 muT and 300 mT demonstrated dramatic contrast enhancement in low fields. A modified inversion recovery technique further enhanced the contrast by selectively suppressing the signal contribution for a specific value of the low-field T-1. Published 2004 Wiley-Liss, Inc.
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