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Abstract #2686

Accurate B0 Mapping with Sparse TE Stepping & K-Space Energy Spectrum Analysis

Pei-Hsin Wu1, Nan-Kuei Chen2, Hsiao-Wen Chung1,3

1Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, Taiwan; 2Brain Imaging & Analysis Center, Duke University Medical Center, Durham, NC, United States; 3Institute of Biomedical Electronics & Bioinformatics, National Taiwan University, Taipei, Taiwan

We proposed an improved multi-TE approach for accurate B0 mapping with phase unwrapping along the TE dimension, using sparse TE spacing for shorter acquisition time. The k-space energy spectrum analysis method was used for an initial estimation of the phase evolution as a function of TE, following which the accurate phase values were derived on a pixel-by-pixel basis from the multi-TE data. Experimental results in the human brain using four TE values with 9 msec spacing suggested that our approach yielded accurate B0 maps in good agreement with those obtained from 37 TE values at 0.752 msec spacing.