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Abstract #3397

Motion Compensation for Free-Breathing Diffusion-Weighted Imaging (MoCo DWI)

Christian Dávid1,2, Thomas Vahle3, Robert Grimm3, Peter Bachert1,2, and Marc Kachelrieß1,4

1Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Faculty of Physics and Astronomy, Heidelberg University, Heidelberg, Germany, 3Siemens Healthcare GmbH, Erlangen, Germany, 4Medizinische Fakultät Heidelberg, Heidelberg University, Heidelberg, Germany

Diffusion-weighted imaging (DWI) of the abdomen has acquisition times of several minutes. For this reason respiratory motion can cause misalignment between acquired slices at the same position but different b-values. To overcome this, we estimate the patients’ respiratory motion using a T1-weighted, stack-of-stars GRE pulse sequence and an advanced 4D reconstruction. This motion estimation is used to compensate for respiratory motion in a common, free-breathing DWI acquisition. In three volunteers an improved alignment of structures in the liver are shown. This allows for a better comparison and potential benefits for further processing (e.g. for ADC-maps).

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