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Abstract #1087

Retrospective Compensation of Cardiac and Respiratory Motion in Mice using nonuniform Self-Gating

Tobias Speidel1, Patrick Metze2, Fabian Straubmueller2, Hao Li1, and Volker Rasche2
1Core-Facility Small Animal Imaging, Ulm University, Ulm, Germany, 2Experimental Cardiovascular MRI, Ulm University Medical Center, Ulm, Germany

The application of self-gating techniques to small animal imaging poses challenging problems, particularly dominated by the high respiratory frequencies. Established self-gating methods are based on information that is extracted either from the k-space itself or from low-resolution images, leading to one-dimensional gating signals. These approaches are prone to fail in the case of arrhythmic respiratory and/or cardiac motion. The concept of nonuniform self-gating is capable of retrospectively considering respiratory and cardiac motion despite significant changes in cardiac or respiratory frequencies by using a two-dimensional gating matrix for deriving the required gating information.

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