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Abstract #4068

Respiratory Motion Artefact Reduction on Abdominal DWI: Simultaneous Use of Dual Bipolar Diffusion Gradient and Navigator Slice Tracking

Tetsuo Ogino1, Tomohiko Horie2, Isao Muro2, Taro Takahara3, Marc Van Cauteren4

1Philips Electronics Japan, LTD, Minato-ku, Tokyo, Japan; 2Department of Radiology, Tokai University, Isehara, Kanagawa, Japan; 3Department of Radiology, University Medical Center Utrecht, Utrecht, Netherlands; 4MR Clinical Science, Philips Healthcare, MInato-ku, Tokyo, Japan

In upper abdominal region, respiratory motion affects image quality of DWI. Motion of the diaphragm causes through-slice tissue motion resulting in blurring and misregistration of adjacent slices. Recently, slice tracking with respiratory navigator was proposed to minimize these artefacts. Another major issue with abdominal DWI is signal loss in soft tissues. It was suggested that voxel deformation due to respiratory and cardiac motion under MPG induces intra-voxel phase dispersion that causes the signal loss. We evaluated the efficiency of dual bipolar MPG on abdominal DWI as a counteraction of this effect, and also combined this method with slice tracking.