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Resolving fold-over artefacts for Reduced Field-of-View Parallel Imaging with Cartesian Sampling
Sen Jia1, Zhilang Qiu1,2, Lei Zhang1, Haifeng Wang1, Xin Liu1, Hairong Zheng1, and Dong Liang1
1Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Shenzhen, China, 2University of Chinese Academy of Sciences, Beijing, China
Full field-of-view image without fold-over artefacts can be reconstructed by reduced FOV parallel imaging given full-FOV calibration is available. 
Figure 1. Multiple maps modelling the aliasing of reduced field-of-view imaging could be created from full-FOV ESPIRiT CSM estimated from full-FOV calibration scan, and used in soft-SENSE reconstruction to reconstruct full-FOV image without fold-over artifacts.
Figure 3. Full-FOV reconstruction of reduced FOV parallel imaging along two phase encoding directions with 2x2 downsampling by proposed ESPIRiT 4 maps created from full-FOV calibration scan