Abstract #0843

A Method for Measuring B0 Field Inhomogeneity using Quantitative DESS (qDESS)

Marco Barbieri¹, Akshay S. Chaudhari^1,2, Catherine J. Moran¹, Garry E. Gold^1,3, Brian A. Hargreaves^1,3,4, and Feliks Kogan¹

¹Department of Radiology, Stanford University, Stanford, CA, United States, ²Department of Biomedical Data Science, Stanford University, Stanford, CA, United States, ³Department of Bioengineering, Stanford University, Stanford, CA, United States, ⁴Department of Electrical Engineering, Stanford University, Stanford, CA, United States

Quantitative T₂ mapping is a valuable tool for studying OA changes. qDESS is a rapid sequence that provides accurate T₂ measurements and SNR-efficient morphological imaging. B₀ mapping is an auxiliary scan acquired to correct field inhomogeneity-induced errors using techniques such as WASSR and 2-GRE. This work proposes a method for B₀ mapping that exploits the phase difference between the two echoes acquired with qDESS. The experiments with phantom and in-vivo simultaneous bilateral knee acquisitions showed that the B₀ maps obtained with the qDESS method were in good agreement with those obtained using the WASSR method and the 2-GRE method.

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