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Abstract #2086

Sub-Volume Utilization Method for Retrospective Motion Correction in Long Acquisition FMRI

Joong Il Kim1, 2, Haewon Nam3, Jeong Hoon Ko2, Hae-Jeong Park1, 2

1BK21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea, Republic of; 2Department of Diagnostic Radiology, Nuclear Medicine and Research Institute of Radiological Science, Seoul, Korea, Republic of; 3Medical Research Institute, Ewha Womans University, Seoul, Korea, Republic of

Motion during long-acquisition interleaved EPI sequence was detected using both discontinuity measure defined by the authors and realignment parameters. Retrospective correction of motion artifact was achieved by sub-volume utilization, which takes advantage of the interleaved characteristics of the acquired sequences. Discontinuity measure and realignment parameter respectively detected inter-volume and intra-volume motion, and thereby complemented each other. The proposed method is especially useful in long-acquisition studies where motion can severely affect image quality.