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Abstract #1417

Feedback field control in 3D 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

Field changes due to respiratory motion disturb T2*-weighted imaging not only in 2D acquisition but also in 3D. Due to the inherent averaging of 3D scans, artifacts were not as pronounced as in 2D in the upper parts of the brain but manifested as a general blurring of the image. However, 3D T2*-weighted scans showed strong ringing artifacts around cavities as well as intensity modulations in the cerebellum. By using real-time field feedback breathing induced spatiotemporal field changes could be corrected and the observed artifacts were strongly reduced.

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