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Abstract #0846

Efficient EPI Distortion Correction using Non-Phase Encoded Reference Data

Anne-Sophie Glantenay1, Chiel J. Den Harder1, Johan S. Van Den Brink1, Gwenael Herigault2, Jos Koonen3

1Advanced Development, Philips Healthcare, Best, Netherlands; 2MR Cliniclal Science, Philips Healthcare, Best, Netherlands; 3MR Development, Philips Healthcare, Best, Netherlands

Diffusion-weighted EPI has become an indispensable tool in body MRI. However geometric distortions due to field inhomogeneities may hamper comparison of the diffusion images with T2W_TSE images. Here we implement and evaluate an efficient geometry correction method based on the non phaseencoded EPI reference acquisition used for Nyquist ghost removal. The method provides accurate and robust global geometry correction in the absence of strong, local phase offsets. It does not require additional time for calibrations, and is directly compatible with parallel imaging methods.