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Abstract #0560

Respiratory Self-Gating for Free-Breathing Abdominal R2* Mapping

Ning Jin1, Andrew C. Larson1,2

1Departments of Radiology and Biomedical Engineering, Northwestern University, Chicago, IL, United States; 2Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, United States

Accurate R2* measurements are critical for a wide range of applications. Abdominal R2* mapping requires breath-holding (BH) to avoid respiratory motion artifacts. However, overall spatial resolution and slice coverage is limited by the requisite BH duration. We developed a respiratory self-gated (RSG) imaging strategy for free-breathing abdominal R2* mapping. The purpose of our study was to compare conventional BH R2* measurements to FB RSG R2* measurements in the liver and kidneys. 3D RSG-mGRE effectively reduced respiratory motion induced artifacts and produced accurate FB R2* maps in the liver and kidneys.