Abstract #2824

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

Zhe Wu¹, Berkin Bilgic^2,3, Hongjian He¹, Yi Sun⁴, Yiping Du⁵, Kawin Setsompop^2,3, and Jianhui Zhong^1,6

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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