• Tzu-Chao Chuang, Teng-Yi Huang, Fa-Hsuan Lin, Fu-Nien Wang, Chun-Jung Juan, Hsiao-Wen Chung, Cheng-Yu Chen, and Kenneth K Kwong.
• Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.
• Magn Reson Med. 2006 Dec 1; 56 (6): 1352-8.

AbstractA technique integrating multishot periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) and parallel imaging is presented for diffusion echo-planar imaging (EPI) at high spatial resolution. The method combines the advantages of parallel imaging to achieve accelerated sampling along the phase-encoding direction, and PROPELLER acquisition to further decrease the echo train length (ETL) in EPI. With an eight-element circularly symmetric RF coil, a parallel acceleration factor of 4 was applied such that, when combined with PROPELLER acquisition, a reduction of geometric distortions by a factor substantially greater than 4 was achieved. The resulting phantom and human brain images acquired with a 256 x 256 matrix and an ETL of only 16 were visually identical in shape to those acquired using the fast spin-echo (FSE) technique, even without field-map corrections. It is concluded that parallel PROPELLER-EPI is an effective technique that can substantially reduce susceptibility-induced geometric distortions at high field strength.

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