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Abstract #1482

Intra-Scan Center Frequency Drift Correction for 3D Spiral Exams

Ashley G Anderson III1, Ryan K Robison1, Dinghui Wang1, Melvyn B Ooi2, and James G Pipe1

1Magnetic Resonance Technology Design Group, Barrow Neurological Institute, Phoenix, AZ, United States, 2Philips Healthcare, Cleveland, OH, United States

High gradient demand and heating results in a changing main magnetic field and center frequency drift during minutes-long acquisitions. Center frequency drifts on the order of tens of Hz may produce visible artifacts in images acquired with long-readout spiral acquisitions. We propose a method for removing such artifacts in spiral acquisitions by demodulating individual spiral arms using a linear interpolation of center frequency measured before and after a scan.

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