Abstract #0312
Utility of real-time field control in T 2 * imaging at 7T
Yolanda Duerst 1 , Michael Wyss 1 , Bertram J Wilm 1 , Benjamin E Dietrich 1 , Simon Gross 1 , David O Brunner 1 , Thomas Schmid 1 , and Klaas P Pruessmann 1
1
ETH Zurich, Zurich, ZH, Switzerland
Respiratory motion leads to field changes that affect
brain MRI. Measurements of breathing induced field
changes showed that spectral power in the frequency
range associated with breathing is strongest in B0, X (ap),
and Z (fh) shims but also non-negligible in some higher
order terms. Furthermore, volunteers with higher body
mass index generally showed more breathing induced field
oscillations which, as expected, decreased with
increasing distance from the chest. Such field changes
lead to image artifacts due to incorrect spatial
encoding and signal loss. Using real-time field feedback
to correct for spatiotemporal field changes strongly
reduced artifacts in T2*-weighted images. Such field
changes lead to image artifacts due to incorrect spatial
encoding and signal loss. Using real-time field feedback
to correct for spatiotemporal field changes strongly
reduced artifacts in T2*-weighted images.
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