Abstract #4612

PROPELLER-EPI-DWI with Oblique N/2 Ghost Correction using 2D Linear Phase Correction & Interlaced Fourier Transform Reconstruction

Hing-Chiu Chang^1,2, Chun-Jung Juan³, Tzu-Chao Chuang⁴, Hsiao-Wen Chung^2,3

¹Global Applied Science Laboratory, GE Healthcare, Taipei, Taiwan; ²Institute of Biomedical Electronics & Bioinformatics, National Taiwan University, Taipei, Taiwan; ³Department of Radiology, Tri-Service General Hospital, Taipei, Taiwan; ⁴Electrical Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan

The PROPELLER-EPI has been shown useful for diffusion applications with reduced geometric distortion. A 2D phase correction with double-FOV reference image can be applied for oblique ghost reduction in each blade prior to PROPELLER-EPI reconstruction. We demonstrate the feasibility of an alternative method without the need for 2D fitting and determination of 2D margin, using double-FOV reference to estimate linear phase along two dimensions, and then combined with interlaced Fourier transform (FT) to reduce the oblique N/2 ghost. Its insensitivity to very low-resolution double-FOV reference is particularly suitable for RPOPELLER-EPI where low-resolution blades are combined to reconstruct high-resolution images.