A B(0) shift correction method based on edge RMS reduction for EPI fMRI |
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Authors: | Kochunov P V Liu H L Andrews T Gao J H Fox P T Lancaster J L |
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Institution: | Research Imaging Center, The University of Texas Health Science Center, San Antonio, Texas 78284, USA. |
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Abstract: | Shifting of echoplanar images (EPI) in the phase-encoding direction during functional magnetic resonance imaging (fMRI) experiments can be observed due to B(0) drift. These shifts can cause artifacts in functional activation maps that can be corrected using a navigator echo (NE) technique, but the NE correction requires pulse sequence modifications not available on many clinical systems. A fast, postprocessing correction method based on edge root-mean-square error reduction (ERMSR) is introduced and shown to provide an equivalent correction. J. Magn. Reson. Imaging 2000;12:956-959. |
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