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Abstract #2824

Zero-padding reconstruction for wave-CAIPI images with improved accuracy, and its application in ViSTa myelin water images

Zhe Wu1, Berkin Bilgic2,3, Hongjian He1, Yi Sun4, Yiping Du5, Kawin Setsompop2,3, and Jianhui Zhong1,6

1Center for Brain Imaging Science and Technology, Department of Biomedical Engineering, Zhejiang University, Hangzhou, China, 2Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 3Department of Radiology, Harvard Medical School, Boston, MA, United States, 4MR Collaboration NE Asia, Siemens Healthcare, Shanghai, China, 5School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China, 6Department of Imaging Sciences, University of Rochester, Rochester, NY, United States

This study presents an intuitive zero-padding (ZP) reconstruction method for wave-encoded images with an improved accuracy. It was shown to be effective in reducing the residual point spread function (PSF) for all wave-encoded images. ZP reduced the errors between the wave-encoded and Cartesian GRE for all wave gradient configurations in simulation and reduced the side-main lobe intensity ratio from 34% to 16% in the thin-slab in vivo Visualization of Short Transverse relaxation time component (ViSTa) images. ZP is applicable for the reconstruction of wave-CAIPI, a recent proposed parallel imaging method using wave-encoding with negligible g-factor penalty under high acceleration factor.

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