Abstract #1389

Susceptibility-induced local ΔB0 variations are essential for predicting EPI distortions in the breast

Michael J van Rijssel¹, Frank Zijlstra¹, Peter R Seevinck¹, Peter R Luijten¹, Dennis W J Klomp¹, and Josien P W Pluim^1,2

¹Center for Image Sciences, UMC Utrecht, Utrecht, Netherlands, ²Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

Applications involving EPI readouts, such as diffusion weighted imaging and functional imaging, are hampered by geometrical distortions caused by static field inhomogeneities (ΔB₀). Pixel shift maps can be inferred from ΔB₀ maps. Though it is common practice to smooth these maps before calculating pixel shifts, doing so reduces susceptibility-induced local ΔB₀ variations. This study investigates the importance of local ΔB₀ changes in correctly predicting EPI distortions. Preliminary data obtained from the human breast in-vivo shows that susceptibility-induced changes in ΔB₀ are essential in accurately predicting EPI distortions.

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