> Details

Lee, Gary C.; Goodwill, Patrick W.; Phuong, Kevin; Inglis, Ben A.; Scott, Greig C.; Hargreaves, Brian A.; Li, Lizabeth; Chen, Alex C.; Shah, Rachana N.; Conolly, Steven M.

Pyrolytic graphite foam: A passive magnetic susceptibility matching material

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  • Media type: E-Article
  • Title: Pyrolytic graphite foam: A passive magnetic susceptibility matching material
  • Contributor: Lee, Gary C.; Goodwill, Patrick W.; Phuong, Kevin; Inglis, Ben A.; Scott, Greig C.; Hargreaves, Brian A.; Li, Lizabeth; Chen, Alex C.; Shah, Rachana N.; Conolly, Steven M.
  • imprint: Wiley, 2010
  • Published in: Journal of Magnetic Resonance Imaging
  • Language: English
  • DOI: 10.1002/jmri.22270
  • ISSN: 1522-2586; 1053-1807
  • Keywords: Radiology, Nuclear Medicine and imaging
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title><jats:sec><jats:title>Purpose:</jats:title><jats:p>To evaluate a novel soft, lightweight cushion that can match the magnetic susceptibility of human tissue. The magnetic susceptibility difference between air and tissue produces field inhomogeneities in the B<jats:sub>0</jats:sub> field, which leads to susceptibility artifacts in magnetic resonance imaging (MRI) studies.</jats:p></jats:sec><jats:sec><jats:title>Materials and Methods:</jats:title><jats:p>Pyrolytic graphite (PG) microparticles were uniformly embedded into a foam cushion to reduce or eliminate field inhomogeneities at accessible air and tissue interfaces. 3T MR images and field maps of an air/water/PG foam phantom were acquired. Q measurements on a 4T tuned head coil and pulse sequence heating tests at 3T were also performed.</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>The PG foam improved susceptibility matching, reduced the field perturbations in phantoms, does not heat, and is nonconductive.</jats:p></jats:sec><jats:sec><jats:title>Conclusion:</jats:title><jats:p>The susceptibility matched PG foam is lightweight, safe for patient use, adds no noise or MRI artifacts, is compatible with radiofrequency coil arrays, and improves B<jats:sub>0</jats:sub> homogeneity, which enables more robust MR studies. J. Magn. Reson. Imaging 2010;32:684–691. © 2010 Wiley‐Liss, Inc.</jats:p></jats:sec>