Utility of real-time field control in T 2 * imaging at 7T

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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