Abstract #1880

Reference-free Unwarping of Multicoil Single-shot GE-EPI Human brain data at 3T

Ying Chen¹, Song Chen¹, Hui Liu², and Jianhui Zhong^1,3

¹Center for Brain Imaging Science and Technology, Zhejiang University, Hangzhou, China, People's Republic of, ²MR Collaboration Northeast Asia, Siemens Healthcare, Shanghai, China, People's Republic of, ³Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China, People's Republic of

Single-shot GE-EPI is widely used in fMRI. However, it is susceptible to field inhomogeneity induced geometric distortions, therefore retrospectively unwarping of the single-shot GE-EPI data is important. A commonly used unwarping technique is based on the field map of the image and it would be desirable to acquire the field map at each time point of a dynamic fMRI measurement series. The aim of this abstract is to qualitatively and quantitatively compare the performance of three reference-free unwarping methods on human brain imaging data. Experimental results demonstrate that the field map obtained from measuring the k-space shifts of each voxel can provide more reliable unwarped images.

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