Abstract #4214

EPI Nyquist ghost removal by incorporating iterative k-space based phase error estimation and correction with SPIRiT (PEC-SPIRiT)

Yilong Liu^1,2, Mengye Lyu^1,2, Victor B. Xie^1,2,3, and Ed X Wu^1,2

¹Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong, China, ²Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China, ³Toshiba Medical Systems (China), Beijing, China

EPI acquisition suffers from Nyquist ghost due to inconsistency between opposite readout directions. As proposed in our previous work, such inconsistency induced phase error can be removed by incorporating the Phase Error Correction with SENSE (PEC-SENSE). In this study, we employ a k-space based phase error estimation, and remove the EPI Nyquist ghost by incorporating phase error correction with SPIRiT (PEC-SPIRiT). Here, a FLASH scan is used for calibration. The proposed method was evaluated using both phantom and in vivo studies, demonstrating its robustness against distortion mismatch and at high accelerations.

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