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Abstract #4719

Motion Induced Signal Non-Uniformity Correction with Asymmetric Bipolar MPG on Liver DWI

Tetsuo Ogino1, Tomohiko Horie2, Isao Muro2, Marc Van Cauteren3, taro takahara4

1Clinical Science , Philips Electronics Japan, LTD, Minato-ku, Tokyo, Japan; 2Tokai Univ. Hospital, Japan; 3Philips Healthcare Asia Pacific, minato-ku, Tokyo, Japan; 4Division of Radiology, Radiotherapy and Nuclear Medicine (RRN), University Medical Center (UMC) Utrecht, Utrecht, Netherlands

Respiratory and Cardiac motion affects DWI IQ on liver. A voxel deformation due to motion under Motion Probing Gradient(MPG) induces spin phase dispersion in a voxel and results signal loss. By replacing conventional MPG with a pair of bipolar gradient, the signal loss is reduced significantly. However, minimum TE and TR are prolonged due to low efficiency of such type of MPG. We propose a novel MPG method which is formed as hybrid of conventional MPG and bipolar MPG. Image quality of liver diffusion is significantly improved with slight scan time prolongation from conventional respiratory triggered DWI.