Abstract #2686

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

Pei-Hsin Wu¹, Nan-Kuei Chen², Hsiao-Wen Chung^1,3

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.