Pei-Hsin Wu1, Hsiao-Wen Chung1, 2, Nan-Kuei Chen3
1Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan; 2Institute of Biomedical Electronics and Bioinformatics, Taipei, Taiwan; 3Brain Imaging and Analysis Center, Duke University Medical Center, Durham, NC, United States
The accuracy of B0 mapping in dual-TE data is dominated by the decision of the phase accumulation time (ΔTE). Specifically, the pronounced phase wrap-around effects and the susceptibility-induced intravoxel signal loss lead to degradation of B0 map with large ΔTE. In this study, an improved approach is proposed for high quantitative accuracy B0 mapping, where the phase unwrapping for phase accumulation map is accomplished by exploiting information from k-space energy spectrum analysis (KESA) accompanying with the appropriate use of the mask in the initial KESA estimation.