Gradiometer pick-up coil design for a low field SQUID-MRI system

H. C. Seton*, J. M S Hutchison, D. M. Bussell

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We describe the use of liquid helium-cooled (4.2 K) gradiometer coils and a DC superconducting quantum interference device (SQUID) preamplifier to improve the SNR of magnetic resonance imaging (MRI) at 0.01 T. Gradiometer windings are used both to reduce lossy interactions with the MRI system's room temperature magnet and gradient coils and also to reject interference from more distant sources, which reduces the need for RF shielding. We have tested both axial and planar (figure-of-eight) gradiometer configurations. The figure-of-eight gradiometer has a more rapid fall-off in sensitivity with increasing distance from its windings than the axial gradiometer, but this is compensated for by reduced lossy interactions and improved interference rejection. We have used the system to image the human arm.

Original languageEnglish
Pages (from-to)116-120
Number of pages5
JournalMagnetic Resonance Materials in Physics, Biology and Medicine
Volume8
Issue number2
DOIs
Publication statusPublished - 1 May 1999

Keywords

  • Cooled RF Coil
  • Gradiometer
  • Low field MRI
  • SQUID

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