Real-time RF Pulse Adjustment for B0 Drift Correction
Benner T, van der Kouwe A, Sorensen A, Wiggins G
Athinoula A. Martinos Center
High duty cycle scans can cause MR scanner frequency drift due to shim heating. This leads to image shift and decreased effectiveness of fat saturation pulses and can result in image artifacts. Methods to correct image shift have been proposed, however, these do not correct the saturation effectiveness. We propose a real-time RF pulse adjustment to synchronize the RF pulses of the sequence with the scanner frequency drift based on the estimation of the frequency drift from the phase correction lines. Real-time RF pulse adjustment is found effective to correct for image drift as well as decreasing fat saturation effectiveness.