Abstract #0509

Metal Artifacts Suppression in Diffusion Imaging Using Point-Spread-Function Encoded EPI

Sisi Li¹, Yishi Wang¹, Zhangxuan Hu^2,3, Xiao Han⁴, Hanwen Zhang⁵, Li Guan⁵, Yong Hai⁵, and Hua Guo¹

¹Center for Biomedical Imaging Research, Tsinghua University, Beijing, China, ²Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ³Department of Radiology, Harvard Medical School, Boston, MA, United States, ⁴Beijing Jishuitan Hospital, Beijing, China, ⁵Department of Orthopedics, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China

Synopsis

Keywords: Diffusion Reconstruction, Diffusion Reconstruction, diffusion imaging, metal artifacts correction, echo-shifting, echo-planar imaging

Motivation: Fast DWI near metal implants remains a substantial challenge.

Goal(s): To reduce metal artifacts in DWI using an efficient 2D imaging approach.

Approach: We proposed a tailored reconstruction method for point-spread-function encoded EPI (PSF-EPI) to improve metal artifacts correction. By taking the advantage of the additional phase encoding (PSF encoding) in PSF-EPI, the intrinsic echo-shifted image series along ky can be used to separate the spectral components of off-resonance frequency and eventually resolve the signal displacements induced by implants.

Results: The results of phantom experiment and in-vivo spinal cord DWI of post-operative CSM patients with implants demonstrate effective metal artifacts reduction.

Impact: The metal artifacts in DWI can be effectively reduced using our proposed reconstruction method for highly accelerated PSF-EPI. This benefits the post-operative evaluations of patients with spinal fusions and allows high-resolution (1.0×1.0 mm²), large-coverage DWI within clinically feasible scan time.

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