Abstract #0028

Integrated high-order B0 shimming for multiparametric quantitative liver imagingat 3T using a UNIfied Coil (UNIC)

Nan Wang¹, Fardad M. Serry², Michael Ocasio², Yibin Xie², Yuheng Huang², Xinqi Li², Pei Han², Tianle Cao², Sen Ma², Fei Han³, Matthew Minton², Yubin Cai², Yujie Shan², Xiaoming Bi³, Anthony G. Christodoulou², Hsin-Jung Yang², Debiao Li², and Hui Han²

¹Stanford University, Stanford, CA, United States, ²Cedars-Sinai Medical Center, Los Angeles, CA, United States, ³Siemens Medical Solutions, Los Angeles, CA, United States

Synopsis

Liver MRI shows promise for rich morphologic and physiologic information. B0 inhomogeneity causes off-resonance spread at the liver-lung interfaces, degrading image quality and quantification accuracy for DWI, T1, and T2*/R2*. A novel high-order shim coil (UNIC) was built, minimizing the decoupling between the two overlapped shim and RF arrays, allowing the free design of shim loop topology in proximity of the target organ. Improved shimming from UNIC is demonstrated with increased FOV in liver imaging, showing significantly reduced distortion in liver DWI, increased image quality score of MOLLI T1 map, and reduced B0-offset-induced ADC, R2*, and B0 standard deviations.

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