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Abstract #3833

Comparison of Methods for Simultaneous Multi-Slice Balanced SSFP Imaging

Yuan Zheng1, LeLe Zhao2, Cong Zhang2, Jian Xu1, Ruchen Peng3, and Weiguo Zhang2

1UIH America, Houston, TX, United States, 2Shanghai United Imaging Healthcare Co., Ltd, Shanghai, People's Republic of China, 3Medical Imaging Center, Beijing Luhe Hospital Affiliated to Capital Medical University, Beijing, People's Republic of China

Many previously reported SMS-bSSFP sequences use RF phase modulation for slice shifting, which inevitably shifts the bSSFP frequency band and is thus susceptible to banding artifacts. Another slice-shifting method is to modulate slice-select dephasing/rephasing gradients. We have studied these two strategies and showed that gradient modulation is more advantageous, since it does not modify the RF phase cycling scheme and bSSFP frequency selectivity is kept the same for all slices. We have acquired phantom and in-vivo head images using both approaches, and demonstrated that gradient modulation does not introduce banding artifacts and produces high quality images.

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