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Abstract #3948

Simultaneous motion and B0 correction using FID-SNAVS

Patricia M Johnson1,2, Junmin Liu1, and Maria Drangova1,2

1Robarts Research Institute, London, ON, Canada, 2Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada

Global B0 shifts caused by subject motion and scanner heating, result in phase inconsistencies, which lead to image artefacts. In this work, an FID readout is added to Spherical Navigator Echoes (FID-SNAVs) in order to perform retrospective motion and frequency shift (Δf) correction. The accuracy of FID-SNAVs in measuring Δf is evaluated, and simultaneous Δf and motion measurement is demonstrated in phantom experiments. FID-SNAVs estimate Δf accurately, and shifts of approximately -10 to 6Hz are measured during translations of ±1.5cm. Combined Δf and motion correction demonstrates dramatic improvement of image quality compared to motion correction alone.

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