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.