Pyrolytic Graphite Foam: a Passive Magnetic Susceptibility Matching Material

Overview

Journal J Magn Reson Imaging

Date 2010 Sep 4

PMID 20815067

Citations 3

Authors

Gary C Lee

Patrick W Goodwill

Kevin Phuong

Ben A Inglis

Greig C Scott

Brian A Hargreaves

Lizabeth Li

Alex C Chen

Rachana N Shah

Steven M Conolly

Affiliations

Soon will be listed here.

Abstract

Purpose: 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(0) field, which leads to susceptibility artifacts in magnetic resonance imaging (MRI) studies.

Materials And Methods: 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.

Results: The PG foam improved susceptibility matching, reduced the field perturbations in phantoms, does not heat, and is nonconductive.

Conclusion: 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(0) homogeneity, which enables more robust MR studies.

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