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Abstract #1150

The Effect of Respiratory and Cardiac Motion States on B0 Shimming at 3T

Yuheng Huang1,2, Xingmin Guan1, Xinheng Zhang1,2, Liqi(Richard) Tang 1, Ghazal Yoosefian1, Xiaoming Bi3, Fei Han3, HsuLei Lee4, Hui Han4, Anthony Christodoulou4, Debiao Li4, Rohan Dharmakumar1, and Hsin-Jung Yang4
1krannert cardiovascular research center, Indiana University school of medicine, Indianapolis, IN, United States, 2Bioengineering, UCLA, LA, CA, United States, 3Siemens Healthineers, Malvern, PA, United States, 4Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States

Synopsis

Keywords: Artifacts, High-Field MRI, Motion-resolved field map, cardiac shimmingB0 inhomogeneity imposes imaging artifacts on CMR images and compromises the reliability of popular B0-sensitive sequences such as SSFP at 3T. B0 shimming is the standard way to improve the B0 field. However, motion-induced field inhomogeneity is an unknown factor in routine practice and compromises B0 shimming. Here, we adopted a motion-resolved mGRE CMR sequence to investigate the cardiac B0 field perturbation caused by cardiac and respiratory motion. We found that respiratory motion has more impact on field inhomogeneity. We recommend acquiring a field map for shimming under an end-expiration breath-hold for better shimming and imaging at 3T CMR.

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Keywords