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Abstract #1880

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

Ying Chen1, Song Chen1, Hui Liu2, and Jianhui Zhong1,3

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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