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Abstract #1302

Motion-induced Magnetic Field Changes Inside the Brain

Jiaen Liu1, Jacco de Zwart1, Peter van Gelderen1, and Jeff Duyn1

1National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, United States

In this study, changes of the B0 field inside the brain due to head motion were measured and analyzed. The sources contributing to this change include a static field introduced by the relative position of the head to the body and the shim coils, and a dynamic one from the head’s orientation and its susceptibility. The experimental results suggest that the component from the head and/or body has a strong magnitude and complex spatial pattern, which makes it difficult to be measured with simple navigators. This B0 field change should be properly taken into account for motion correction.

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