Abstract #0515

Robust 2D Nyquist Ghost Correction for Simultaneous Multislice (SMS) EPI Using Phase Error Correction SENSE and Virtual Coil SAKE

Mengye Lyu^1,2, Markus Barth³, Victor B. Xie^1,2,4, Yilong Liu^1,2, Yanqiu Feng^1,5, and Ed X. Wu^1,2

¹Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong SAR, People's Republic of China, ²Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong SAR, People's Republic of China, ³Centre for Advanced Imaging, University of Queensland, Brisbane, Australia, ⁴Toshiba Medical Systems (China), Beijing, People's Republic of China, ⁵School of Biomedical Engineering, Southern Medical University, Guangzhou, People's Republic of China

Nyquist ghost is problematic in SMS EPI because the ghost is slice-dependent and can interfere with slice separation process. The inconsistency between positive and negative echoes can be represented by 2D phase error maps. This study presents a new and robust SENSE-based method. It estimates both phase error maps and coil sensitivities from one plain EPI based calibration scan, and then uses these maps for ghost-free SMS EPI reconstruction. Further, to improve coil sensitivity estimation, virtual coil SAKE is incorporated to reduce the high order Nyquist ghost in the calibration scan.

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