Abstract #2184

High Resolution Simulation of B0 Field Conditions in the Human Heart Based on Segmented CT Images

Yun Shang¹, Sebastian Theilenberg¹, Wolfram Mattar², Maxim Terekhov², Sachin R Jambawalikar³, Laura M Schreiber^2,4, and Christoph Juchem^1,3

¹Department of Biomedical Engineering, Columbia University in the City of New York, New York, NY, United States, ²Section of Medical Physics, Department of Radiology, Mainz University Hospital, Mainz, Germany, ³Department of Radiology, Columbia University in the City of New York, New York, NY, United States, ⁴Department of Cellular and Molecular Imaging, Comprehensive Heart Failure Center (CHFC), Wuerzburg, Germany

B₀ inhomogeneity leads to dark band artifacts in cardiac MRI, in particular with the use of steady-state free precession (SSFP) pulse sequences. Limited spatial resolution of MRI-derived in vivo B₀ maps and, moreover, the lack of population data prevents the systematic analysis of the problem at hand and the development of optimized B₀ shim strategies. We used readily available CT images to derive the B₀ conditions in the human heart at very high resolution. Calculated cardiac B₀ fields showed consistency with MRI-based B₀ measurements and local field artifacts concur with typical dark band locations. The approach is expected to enable the development of population-specific B₀ shim strategies for the human heart.

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